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Introduction As a passive device, Capacitors have unique functions in electronic circuits such as tuning, bypassing, coupling, and filtering. For example, it is used in the tuning circuit of the transistor radio, and also used in the coupling circuit and bypass circuit of the color TV. With the rapid development of electronic information technology, the update speed of digital electronic products is getting faster and faster. Capacitors play an important role in consumer electronic products such as flat-panel TVs (LCD and PDP), notebook computers, digital cameras and other products. Therefore, it is very important to ensure the capacitances and test its quality. Here this article will talk about how to test/check a capacitor in detail. 3 Ways to Check Capacitors in Circuit with Meters & Testers Catalog Introduction Ⅰ Test a Capacitor Using Multimeter 1.1 Digital Multimeter Use 1.2 Capacitor Measurements Matter 1.3 Test Non-polar Capacitors 1.4 Test Polar Capacitors 1.5 Test Chip Capacitors 1.6 Test Solid State Capacitors 1.7 Test Electrolytic Capacitors 1.8 Test Variable Capacitors 1.9 Capacitor Polarity Distinction Ⅱ Test a Capacitor Using Bridge Ⅲ Test a Capacitor Using Professional Equipment Ⅳ FAQ Ⅰ Test a Capacitor Using Multimeter 1.1 Digital Multimeter Use 1.1.1 Using Capacitance GearSome digital multimeters have the function of measuring capacitance, and their ranges include five ranges: 2000p, 20n, 200n, 2μ and 20μ. During test, the two pins of the discharged capacitor can be directly inserted into the Cx jack on the meter board, and the display data can be read after selecting the appropriate range.🔺2000p range is suitable for measuring capacitances less than 2000pF.🔺20n range is suitable for measuring capacitances between 2000pF and 20nF.🔺200n range is suitable for measuring capacitances between 20nF and 200nF.🔺2μ range is suitable for measuring capacitances between 200nF and 2μF.🔺20μ gear is suitable for measuring the capacitance between 2μF and 20μF. Experiments have proved that some types of digital multimeters have large errors when measuring small capacitors below 50pF, and there is almost no reference value for measuring capacitors below 20pF. At this time, the series method can be used to measure small-value capacitors. For example: measure a capacitor of about 220pF. Test its actual capacity C1 with a digital multimeter, and then connect the small capacitor in parallel to measure its total capacity C2, then the difference between the two (C1-C2) is the capacity of the small capacitor. It is very accurate to use this method to measure small capacitance of 1-20pF. 1.1.2 Using Resistance GearIn practice, it has proved that the charging process of the capacitor can also be observed with a digital multimeter, which is actually a discrete digital quantity that reflects the change of the charging voltage. Assuming that the measurement rate of the digital multimeter is n times/second, in the process of observing the charging of the capacitor, n independent and successively increasing readings can be seen every second. According to this display values, the quality of the capacitor can be detected and the size of the capacitance can be estimated. This method is suitable for measuring large-capacity capacitors from 0.1μF to several thousand microfarads. 1.1.3 Using Voltage GearUsing a digital multimeter to detect capacitors with DC voltage is actually an indirect method. This method can measure small-capacity capacitors from 220pF to 1μF, and can accurately measure the size of the capacitor's leakage current. 1.1.4 Using BuzzerUsing the buzzer of the digital multimeter, you can quickly check the quality of the electrolytic capacitor. For example, set the digital multimeter to the buzzer position, and use two test leads to contact the two pins of the capacitor Cx to be tested. A short buzzer should be heard, then the sound stops, and the overflow symbol "1" is displayed at the same time. Then, exchange the two test leads for another measurement, the buzzer should sound again, and finally the overflow symbol "1" is displayed. This situation indicates that the measured electrolytic capacitor is basically normal. At this point, you can dial to 20MΩ or 200MΩ to measure the leakage resistance of the capacitor to judge whether it is good or bad. Figure 1. Various Capacitor Stuff 1.2 Capacitor Measurements Matter (1) Before the measurement, the two pins of the capacitor should be short-circuited and discharged, otherwise the reading process may not be observed.(2) Do not touch the capacitor electrode with two hands during the measurement process, so as to prevent the meter from jumping.(3) During the measurement process, the value of Vin(t) changes exponentially, and it drops quickly at the beginning. As time goes by, the speed of decline will become slower and slower. When the capacity of the capacitor Cx under test is less than several thousand picofarads, and the measurement rate of the meter is low, it is too late to reflect the initial voltage value, so the initial display value of the meter is lower than the battery voltage at very first.(4) When the measured capacitance value is greater than 1μF, in order to shorten the test time, the resistance gear can be used. In addition, when the capacity of the capacitor under test is less than 200pF, it is difficult to observe the charging process because the change in readings is very short.Be sure to cut off the power and discharge capacitor before measuring. The method of discharging is to find a metal object such as a screwdriver, hold the exposed part of the metal on the insulating handle with the two pins, and measure the capacitance with a digital multimeter. Locate the capacitor block and then plug the two pins into the socket for capacitance measurement, and wait for the changing reading on the meter screen to stabilize. The actual value is the capacitance of the capacitor on the side. If has leakage, an analog multimeter can be used. When measuring, the small-capacity capacitor multimeter can be placed in RX1K or RX100. The two test leads are connected to the capacitor, the pointer deflects clockwise, and then as the capacitor is fully charged, there is no current flows, finally the watch hand will reappear counterclockwise and return to infinity. The larger the angle of the watch hand, the greater the capacity. During the deflection process, the pointer must swing at a constant speed so that it can return to infinity, which preliminarily shows that the capacitor has no leakage.If the needle suddenly slows down or does not return at a certain position on the dial, it means that the capacitor is leaking in a certain period. If it is displayed as infinity at the end, it shows that there is no leakage, but this can only be a rough judgment. If you want to find an accurate value, you have to use a capacitance meter. And the observation characteristic on the capacitance leakage tester or oscilloscope, this is impossible for ordinary people to have. There are also capacitors that have withstand voltage, which is generally written on their body. However, some ceramic capacitors are not marked on it, be careful when selecting them. Figure 2. Film Capacitor (cbb21) 1.3 Test Non-polar CapacitorsIf it is a non-polar capacitor, the multimeter can be adjusted to the "diode" gear to measure the on-off state. If the multimeter displays "1", it is normal; if displays "0" or other numbers, it means the capacitor is damaged. 1.4 Test Polar CapacitorsElectrolytic capacitors with polarities have "bulging", "deformation" or "leakage" in the shell, which show they are damaged. The capacitance block of a digital multimeter can also be used to measure the quality of the capacitor:(1) According to the rated capacitance marked by the capacitor, set the multimeter to the appropriate block.(2) Insert the capacitor into the hole of the multimeter to measure the capacity.If the capacitance is within the rated value range, it means the capacitor is intact, otherwise the capacitor is damaged. 1.5 Test Chip Capacitors1) Adjust the multimeter to the appropriate ohm gear. The principle of gear selection is: 1μF capacitor uses 20K gear, 1~100μF capacitor uses 2K gear, and larger than 100μF uses 200 gear.2) Determine the polarity. First adjust the multimeter to 100 or 1K ohms. Assuming that one pole is positive, connect the black test lead to it, and the red test lead to the other pole. Note the resistance value, and then discharge the capacitor. Then change the test lead to measure the resistance. The black test lead with a large resistance value is connected to the positive electrode of the capacitor.3) Then connect the red pen of the multimeter to the positive electrode of the capacitor, and the black pen to the negative electrode of the capacitor. If the display gradually increases from 0, and the overflow symbol 1 is displayed at the end, which shows the capacitor is normal. If it is always displayed as 0, the capacitor is short-circuited. If 1 is displayed, the internal circuit of the capacitor is open. Figure 3. Chip Capacitors 1.6 Test Solid State Capacitors✔️Capacitance Greater than 20μFWith a common digital multimeter, the maximum measured value of the capacitance block is 20μF, which sometimes cannot meet the test requirements. To this end, the following simple method can be used to measure capacitance greater than 20μF, and also the maximum capacitance of several thousand microfarads can be measured. When using this method to measure large-capacity capacitors, there is no need to make any changes to the original circuit of the digital multimeter.The measurement principle of this method is based on the formula C = C1C2/(C1+C2) in series with two capacitors. Since two capacitors with different capacities are connected in series, the total capacity after series connection is smaller than the smaller capacitor. Therefore, if the capacity of the capacitor under test exceeds 20μF, only one capacitor with a capacity less than 20μF should be used. In series with it, it can be directly measured on the digital multimeter. According to the formula above mentioned, it is easy to deduce C1=C2C/(C2-C), using this formula can calculate the capacitance value of the capacitor under test. ✔️Capacitance Less than 10μFBecause the capacity of a fixed capacitor below 10pF is too small, it can only be roughly checked for leakage, internal short circuit or voltage breakdown with a multimeter. When measuring, you can choose the R×10k block, and use two test pens to connect the two pins of the capacitor arbitrarily, and the resistance should be infinite. If the measured resistance value (the pointer swings to the right) is zero, it means that the capacitor is damaged by leakage or has internal breakdown. ✔️Capacitance between 10PF and 0.01μFDetect whether the capacitor is charging, and then judge whether it is good or bad. The multimeter selects the R×1k block. The β value of the two transistors is above 100, and the penetration current should be small. A composite tube can be used consist of silicon transistors. The red and black test leads of the multimeter are respectively connected to the emitter e and collector c of the composite tube. Due to the amplification effect of the composite triode, the charge and discharge process of the capacitor under test is amplified, and the amplitude of the pointer of the multimeter is enlarged, which is convenient for observation. It should be noted that during the test operation, especially when measuring small-capacity capacitors, it is necessary to repeatedly exchange the contact points A and B of the tested capacitor pin to clearly see the swing of the meter pointer. ✔️Fixed Capacitance of 0.01μFFor a fixed capacitance above 0.01μF, the R×10k block of a multimeter can be used to directly test whether the capacitor has the charging process and internal short circuit or leakage, in addition, the capacitance of the capacitor can be estimated according to the magnitude of the pointer swing to the right. Figure 4. Electrolytic Capacitors 1.7 Test Electrolytic Capacitors1) Because the capacity of electrolytic capacitors is much larger than that of general fixed capacitors, ranges should be selected for different capacities when measuring. According to experience, in general, the capacitance between 1 and 47μF can be measured with the R×1k block, and the capacitance larger than 47μF can be measured with the R×100 block.2) Connect the red test lead of the multimeter to the negative pole and the black test lead to the positive pole. At the moment of contact, the pointer of the multimeter will deflect to the right by a greater degree (for the same electrical barrier, the greater the capacity, the greater the swing), and then gradually turn to the left Turn around until it stops at a certain position. The resistance value at this time is the forward leakage resistance of the electrolytic capacitor, which is slightly larger than the reverse leakage resistance. Practical experience shows that the leakage resistance of electrolytic capacitors should generally be more than several hundred kΩ, otherwise, it will not work normally. In the test, if there is no charging phenomenon in the forward and reverse directions, that is, the hand does not move, it means that the capacity has disappeared or the internal circuit is broken; if the measured resistance value is very small or zero, it means that the capacitor has a large leakage or has been broken down.3) For electrolytic capacitors with unknown positive and negative signs, the above method of measuring leakage resistance can be used to distinguish. That is to measure the leakage resistance arbitrarily, remember its size, and then exchange the test leads to measure a resistance value. The larger resistance of the two measurements is the positive connection, that is, the black test lead is connected to the positive electrode, and the red test lead is connected to the negative electrode. Use a multimeter to block electricity and charge the electrolytic capacitor. According to the magnitude of the pointer swing to the right, the capacity of the electrolytic capacitor can be estimated.When measuring electrolytic capacitors, if the measured value does not change significantly, the corresponding pins of the probe should be exchanged for multiple measurements. 1.8 Test Variable Capacitors1) Rotate the shaft gently and smoothly. When pushing the load shaft in full directions, there should be no looseness of it.2) Rotate the shaft with one hand and gently touch the outer edge of the film set with the other hand. You should not feel any looseness. The variable capacitor with poor contact between the rotating shaft and the moving plate can no longer be used.3) Place the multimeter in the R×10k gear, connect the two test leads to the moving piece and the lead end of the fixed piece of the variable capacitor with one hand, and slowly rotate the shaft several times back and forth with the other hand. The pointers of the multimeter should not move at infinity. In the process of rotating the shaft, if the pointer sometimes points to zero, it indicates that there is a short-circuit point between the moving piece and the fixed piece. If it encounters a certain angle, the multimeter reading is not infinity but a certain resistance value, indicating that the variable capacitor has a leakage phenomenon between the film and the stator. 1.9 Capacitor Polarity DistinctionThe black part with a mark on the capacitor is negative. There are two semicircles on the position of the capacitor on the PCB, and the pin corresponding to the colored semicircle is the negative electrode. The length of the pins is also useful to distinguish the polarity: the long pin is anode and the short pin is cathode.When we don't know the positive and negative poles of the capacitor, we can use a multimeter to figure them out. The medium between the two poles of the capacitor is not an absolute insulator, and its resistance is not infinite, but a finite value, generally above 1000 megohms. The resistance between the two poles of a capacitor is called insulation resistance or leakage resistance. Only when the positive electrode of the electrolytic capacitor is connected to the positive power supply (the black test lead), and the negative terminal is connected to the negative power supply (the red test lead), the leakage current is small (the leakage resistance is large), on the contrary, the leakage current increases (the leakage resistance decreases).Without knowing it, you can first assume the “+” pole of a certain pole. Using R*100 or R*1K of the multimeter, connect the test leads, and record the scale of the stop of the test needle (the resistance value of the test needle to the left is large), and the reading can be read directly for a digital multimeter. Then discharge the capacitor, then exchange the two test leads, and perform the measurement again. In the two measurements, the black test lead is connected to the positive electrode of the electrolytic capacitor when the last position of the needle is to the left (or the end with large resistance).When measuring large capacity capacitors, if you need to measure the positive and negative back and forth, discharge it to avoid damage to the multimeter. In addition, in high-frequency circuits, switching power supply circuits have many small capacitors, which ordinary multimeters cannot correctly judge whether they are good or bad. In terms of this case, it is recommended to use a dedicated digital capacitance meter to measure. Figure 5. SMD Capacitor Ⅱ Test a Capacitor Using BridgeThe data measured with a multimeter is not too accurate, and it can only measure the deviation of the capacity. For a little professional, you can use a bridge. When testing a capacitor with a digital bridge, you can clamp the lead of the capacitor to test its capacity, which can also show the loss of the capacitor, especially through the loss, it is easier to distinguish the quality of the capacitor.   Ⅲ Test a Capacitor Using Professional EquipmentIn general, capacitors have special test equipment for each performance, such as capacitor durability test, destructive test, loss angle test, inter-electrode withstand voltage test, self-healing test, charge and discharge test, pulse voltage test, spontaneous combustion test, ripple current durability test, etc., but for most users, these devices are more expensive and difficult to operate. If you really want these data, you can entrust a third party to test or ask the manufacturer for relevant information.   Ⅳ FAQ1. How do you check if a capacitor is bad?Use the multimeter and read the voltage on the capacitor leads. The voltage should read near 9 volts. The voltage will discharge rapidly to 0V because the capacitor is discharging through the multimeter. If the capacitor will not retain that voltage, it is defective and should be replaced.   2. How do you tell if a capacitor is bad with a multimeter?If the capacitance value is within the measurement range, the multimeter will display the capacitor's value. It will display OL if a) the capacitance value is higher than the measurement range or b) the capacitor is faulty.   3. What are the symptoms of a bad start capacitor?Start Capacitor FailureMotor run capacitor failure symptoms include warm air flowing from the vents inside the home, the air conditioner taking more time than usual to kick on or it turns off before it is programmed to, or there is a constant low hum emitting from the machine that isn't typical.   4. Can a capacitor test good and still be bad?It can, and most often does, although it is probably lower in capacitance than it originally was, but still usually within tolerance. There isn't likely to be a problem with leakage. There are two ways to test an ESR meter, a circuit unpowered or an oscilloscope.   5. How long can a capacitor last?Age. Like all things, capacitors have a limited life span. Most are designed to last approximately 20 years, but a number of factors can cause them to wear out more quickly.   6. How do you identify a capacitor?Ceramic types of capacitors generally have a 3-digit code printed onto their body to identify their capacitance value in pico-farads. Generally the first two digits indicate the capacitors value and the third digit indicates the number of zero's to be added.   7. Will a capacitor discharge on its own?Will a Capacitor Discharge On Its Own? In theory, a capacitor will gradually lose its charge. A fully charged capacitor in an ideal condition, when disconnected, discharges to 63% of its voltage after a single time constant. Thus, this capacitor will discharge up to near 0% after 5 time constants.   8. How do I know if my AC capacitor is bad?The most common signs and symptoms of a bad AC capacitor include:AC not blowing cold air.AC takes a while to start once you turn it on.Humming sound coming from your air conditioner.AC shuts off on its own.AC won't turn on.   9. What side of capacitor is positive?To tell which side is which, look for a large stripe or a minus sign (or both) on one side of the capacitor. The lead closest to that stripe or minus sign is the negative lead, and the other lead (which is unlabeled) is the positive lead.   10. Can I use a multimeter to discharge a capacitor?The multimeter isn't used directly to discharge the stored energy of a capacitor. Instead, people use it to measure the voltage and power of the capacitor to know whether it is fully released or not. You can use different tools such as a light bulb or a DIY discharge tool for the process.   11. How fast can a capacitor discharge?A fully charged capacitor discharges to 63% of its voltage after one time period. After 5 time periods, a capacitor discharges up to near 0% of all the voltage that it once had.   12. Can a bad capacitor ruin a compressor?Using the wrong capacitor rating or a poor quality capacitor can adversely affect the operation of the motor, the compressor or an entire HVAC system. ... Depending on the motor load, this may result in a reduction in the motor's overall speed.   13. Can I replace a start capacitor with a run capacitor?Run Capacitors. Start capacitors give a large capacitance value necessary for motor starting for a very short period of time (usually seconds long). ... A start capacitor can never be used as a run capacitor, because it cannot not handle current continuously.   14. How do you check a capacitor without a multimeter?Just connect those two ends of the capacitor to a single phase supply and switch it ON for a few seconds. Then take that two terminal and short it, you will get a spark. And so you can somewhat assume that your capacitor is in good condition.   15. What if a capacitor reads high?The high resistance across the capacitor is a sign that the capacitor is faulty. It is reading as if there is an open circuit.   16. How many ohms should a capacitor have?Make sure the capacitor is fully discharged. Set the meter on the Ohmic range (Set it at least on 1000 Ohm = 1kΩ). Connect the multimeter probes to the capacitor terminals (Negative to Negative and Positive to Positive).   17. What if a capacitor reads low?If it reads lower than nominal value, you may want to replace it. Non-polar capacitors lower than 1μF should not alter that much with aging. Capacitors in frequency sensitive circuits such as filters, time delays, should have a tighter tolerance.   18. What happens when capacitor goes bad?A bad capacitor prevents the exterior unit from properly functioning, which hinders the cooling process as a whole. Second, improper voltage delivery to exterior unit components forces the system to work harder as it attempts to perform its job. Additional components often sustain damage due to a faulty capacitor.   19. How can you tell if a capacitor is bad?Symptoms of defective capacitors may include:Excessive noise in audio or video, including 60hz audio hum or rolling bars in video.Scratchy, distorted, or missing audio.Low contrast, blurry, or distorted LCD displays.Intermittent or outright failure.   20. What does a damaged capacitor look like?A busted capacitor can be obviously broken (leaking brownish fluid, corroded, or with the leads severed), but sometimes it's subtle. The top of a blown capacitor will be slightly bent outwards in a convex shape, rather than flat or slightly indented inwards like a working capacitor.

Ⅰ IntroductionWhen connected to a voltage source, capacitors are basic passive devices that can store an electrical charge on their plates. The capacitor, like a miniature rechargeable battery, has the ability or "capacity" to store energy in the form of an electrical charge, producing a potential difference (Static Voltage) across its plates. Capacitors come in a variety of sizes and shapes, ranging from tiny capacitor beads used in resonance circuits to enormous power factor correction capacitors, but they always store charge. this video shows how capacitors work CatalogⅠ IntroductionⅡ Types of Capacitor2.1 Dielectric Capacitor2.2 Variable Capacitor Symbol2.3 Film Capacitor Type2.4 Axial Lead Type2.5 Ceramic Capacitors2.6 Electrolytic Capacitors2.7 Aluminium Electrolytic Capacitors2.8 Tantalum Electrolytic Capacitors2.9 Frequently Asked Questions About Different Types Of CapacitorⅢ The Capacitance of a Capacitor3.1 SI Unit of Capacitance3.2 μF vs. nF vs. pF3.3 Frequently Asked Questions about the Capacitance of a CapacitorⅣ Capacitor Conversion: µF-nF-pF 4.1 Capacitor Conversion Chart4.2 Popular Capacitor Conversions4.3 Frequently Asked Questions about Capacitor ConversionⅤ Capacitor Color Code5.1 Capacitor Colour Code Tables5.2 Color Codes of Different Capacitors5.3 Frequently Asked Questions about Capacitor Color CodeⅥ Capacitor Code6.1 Types of Capacitor Code6.2 Frequently Asked Questions about Capacitor CodeⅦ Capacitor Code Calculator7.1 Capacitor Safety Discharge Calculator Tool7.2 Series and Parallel Capacitance Calculator Ⅱ Types of CapacitorFrom very small delicate trimming capacitors used in oscillator or radio circuits to enormous power metal-can type capacitors used in high voltage power correction and smoothing circuits, capacitors are available. The dielectric used between the plates is commonly used to make comparisons between different types of capacitors. There are variable varieties of capacitors, just like resistors, that allow us to adjust their capacitance value for use in radio or "frequency tuning" circuits. Metallic foil is interwoven with thin sheets of either paraffin-impregnated paper or Mylar as the dielectric material in commercial capacitors. Because the metal foil plates are rolled up into a cylinder to produce a compact box with the insulating dielectric material sandwiched in between, some capacitors resemble tubes. Ceramic materials are frequently used to make small capacitors, which are subsequently sealed with epoxy resin. Capacitors play a crucial role in electronic circuits in any case, therefore here are a few of the most "common" capacitor types available. 2.1 Dielectric CapacitorWhen a constant variation in capacitance is necessary for tuning transmitters, receivers, and transistor radios, dielectric capacitors are normally of the variable variety. Multi-plate air-spaced variable dielectric capacitors have a set of fixed plates (the stator vanes) and a set of movable plates (the rotor vanes) that move in between the fixed plates. The overall capacitance value is determined by the position of the moving plates concerning the fixed plates. When the two sets of plates have entirely meshed together, the capacitance is usually at its highest. With breakdown voltages in the thousands of volts, high voltage tuning capacitors have relatively large spacings or air gaps between the plates. 2.2 Variable Capacitor SymbolTrimmers are pre-set type variable capacitors that are available in addition to continuously variable varieties. These are typically small devices that may be modified or "pre-set" to a specific capacitance value with a small screwdriver, and are available in very low capacitances of 500pF or less, and are non-polarized. variable capacitor symbol 2.4 Axial Lead TypeLong thin strips of thin metal foil with the dielectric material sandwiched between them are twisted into a tight roll and then sealed in paper or metal tubes for film and foil capacitors. To lessen the possibility of tears or punctures in the film, these film types require a significantly thicker dielectric film and are thus better suited to lower capacitance values and bigger case sizes. axial-lead-type Metalized foil capacitors have the conductive film metalized sprayed directly onto each side of the dielectric, giving the capacitor self-healing capabilities and allowing thinner dielectric films to be used. For a given capacitance, this enables for larger capacitance values and smaller case sizes. Film and foil capacitors are typically employed in situations that require more power and precision. 2.5 Ceramic CapacitorsCeramic capacitors, also known as Disc capacitors, are created by coating two sides of tiny porcelain or ceramic disc with silver and stacking them together to form a capacitor. A single ceramic disc of roughly 3-6mm is utilized for very low capacitance values. Ceramic capacitors have a high dielectric constant (High-K) and are available in tiny physical sizes, allowing for relatively high capacitances. ceramic capacitor Because they are non-polarized and exhibit huge non-linear changes in capacitance with temperature, they are employed as de-coupling or by-pass capacitors. Ceramic capacitors range in size from a few picofarads to one or two microfarads, but their voltage ratings are often modest. A three-digit code is usually inscribed on the body of ceramic capacitors to identify their capacitance value in pico-farads. The first two digits usually represent the capacitor's value, while the third digit represents the number of zeros to be added. A ceramic disc capacitor marked 103, for example, would indicate 10 and 3 zeros in pico-farads, which is equal to 10,000 pF or 10nF. The numerals 104, for example, represent 10 and 4 zeros in pico-farads, which is comparable to 100,000 pF or 100nF, and so on. The digits 154 on the ceramic capacitor image above represent 15 and 4 zeros in pico-farads, which is comparable to 150,000 pF, 150nF, or 0.15F. To signify their tolerance value, letter codes are occasionally employed, such as J = 5%, K = 10%, M = 20%, and so on. 2.6 Electrolytic CapacitorsWhen very large capacitance values are required, electrolytic capacitors are typically utilized. Instead of employing a very thin metallic film layer for one of the electrodes, a semi-liquid electrolyte solution in the form of jelly or paste is employed (usually the cathode). The dielectric is a very thin layer of oxide that is produced electrochemically in the manufacturing process and has a thickness of fewer than ten microns. Because the insulating layer is so thin, capacitors with a big capacitance value can be made in a small physical size because the distance between the plates, d, is so short. electrolytic capacitor The majority of electrolytic capacitors are polarized, which means that the DC voltage applied to the capacitor terminals must be of the correct polarity, i.e. positive to the positive terminal and negative to the negative terminal, or the insulating oxide layer will be broken down and permanent damage may result. The polarity of all polarized electrolytic capacitors is indicated with a negative sign to signify the negative terminal, which must be followed. Due to their huge capacitance and small size, electrolytic capacitors are commonly employed in DC power supply circuits to help reduce ripple voltage or for coupling and decoupling applications. Electrolytic capacitors have a low voltage rating, which means that they can't be utilized on AC supply because of their polarization. Aluminium Electrolytic Capacitors and Tantalum Electrolytic Capacitors are the two most common types of electrolytes. 2.7 Aluminium Electrolytic CapacitorsThe plain foil type and the etched foil type are the two varieties of Aluminum Electrolytic capacitors. These capacitors have extremely high capacitance values for their size due to the thickness of the aluminum oxide coating and the high breakdown voltage.aluminium electrolytic capacitor A DC current is used to anodize the capacitor's foil plates. The polarity of the plate material is established during the anodizing process, which defines which side of the plate is positive and which side is negative. The aluminum oxide on the anode and cathode foils has been chemically etched to increase surface area and permittivity, which makes the etched foil type different from the plain foil type. This results in a smaller capacitor than a normal foil type of comparable value, but it has the disadvantage of not being able to handle strong DC currents. Their tolerance range is also fairly high, reaching up to 20%. Capacitance values for aluminum electrolytic capacitors typically range from 1uF to 47,000uF. Plain foil electrolytes are better suited as smoothing capacitors in power supply, while etched foil electrolytes are best employed in the coupling, DC blocking, and by-pass circuits. However, because aluminum electrolytes are “polarized” devices, inverting the applied voltage on the leads will damage the insulating layer within the capacitor, as well as the capacitor itself. The capacitor's electrolyte, on the other hand, aids in the healing of a damaged plate if the damage is minor. The electrolyte has the power to re-anodize the foil plate since it can self-heal a damaged plate. The electrolyte can remove the oxide layer from the foil if the anodizing process is reversed, as it would if the capacitor was connected with reverse polarity. Because the electrolyte can conduct electricity, if the aluminum oxide layer is removed or destroyed, current can flow from one plate to the other, causing the capacitor to fail, "so be alert." 2.8 Tantalum Electrolytic CapacitorsTantalum Electrolytic Capacitors and Tantalum Beads come in both wet (foil) and dry (solid) electrolytic varieties, with dry tantalum being the most prevalent. Solid tantalum capacitors have a second terminal of manganese dioxide and are physically smaller than analogous aluminum capacitors. Tantalum oxide's dielectric characteristics are superior to those of aluminum oxide, resulting in reduced leakage currents and greater capacitance stability, making it ideal for blocking, by-passing, decoupling, filtering, and timing applications. Tantalum capacitors, although being polarized, can withstand being linked to a reverse voltage considerably better than aluminum capacitors, but they are rated at much lower operating voltages. Solid tantalum capacitors are commonly employed in circuits with low AC voltages compared to DC voltages. Some tantalum capacitors, on the other hand, comprise two capacitors in one, connected negative-to-negative to make a “non-polarized” capacitor for use in low voltage AC circuits. The positive lead of a tantalum bead capacitor is usually identifiable by a polarity mark on the capacitor body, which has an oval geometrical shape. Capacitance values typically vary from 47nF to 470F. 2.9 Frequently Asked Questions About Different Types Of Capacitor1. Which type of capacitor is best?Class 1 ceramic capacitors offer the highest stability and lowest losses. They have high tolerance and accuracy and are more stable with changes in voltage and temperature. Class 1 capacitors are suitable for use as oscillators, filters, and demanding audio applications. 2. Does the type of capacitor matter?Yes, the type of capacitor can matter. Different types of capacitor have different properties. Some of the properties that vary between capacitor types: polarized vs unpolarized. 3. Are all capacitors the same?Not all capacitors are created equal. Each capacitor is built to have a specific amount of capacitance. The capacitance of a capacitor tells you how much charge it can store, more capacitance means more capacity to store charge. 4. Which type of capacitor is known as Polarised capacitor?Electrolytic Capacitors. The Electrolytic Capacitors are the capacitors which indicate by the name that some electrolyte is used in it. They are polarized capacitors which have anode + and cathode − with particular polarities. A metal on which insulating oxide layer forms by anodizing is called as an Anode. 5.Which capacitors are not polarized?Ceramic, mica and some electrolytic capacitors are non-polarized. You'll also sometimes hear people call them "bipolar" capacitors. A polarized ("polar") capacitor is a type of capacitor that have implicit polarity -- it can only be connected one way in a circuit. Ⅲ The Capacitance of a CapacitorThe Farad (abbreviated to F) is the unit of capacitance and is named after the British physicist Michael Faraday. Capacitance is the electrical property of a capacitor and is the measure of a capacitor's ability to store an electrical charge onto its two plates. When a charge of One Coulomb is stored on the plates by a voltage of One volt, a capacitor has a capacitance of One Farad. It's worth noting that capacitance, or C, is always positive and has no negative units. However, because the Farad is a relatively big unit of measurement on its own, sub-multiples such as micro-farads, nano-farads, and pico-farads are commonly used. 3.1 SI Unit of CapacitanceCapacitors are a common type of electrical component, and their values are usually stated in microfarads, F (or uF if a micro character is not available), nanofarads, nF, or picofarads, pF. Microfarad (μF)  1μF = 1/1,000,000 = 0.000001 = 10-6 FNanofarad (nF)  1nF = 1/1,000,000,000 = 0.000000001 = 10-9 FPicofarad (pF) 1pF=1/1,000,000,000,000 = 0.000000000001 = 10-12 F 3.2 μF vs. nF vs. pFAlthough most current circuits and component descriptions use the nomenclature F, nF, and pF to specify capacitor values, older circuit designs, circuit descriptions, and even the components themselves may employ a variety of non-standard acronyms that aren't always evident. The following are the main changes for the various capacitance sub-multiples: Micro-Farad, µF: Larger value capacitors, such as electrolytic capacitors, tantalum capacitors, and even some paper capacitors measured in micro-Farads, may have been labeled with uF, mfd, MFD, MF, or UF. All of these terms refer to the value in µF. Electrolytic and tantalum capacitors are commonly connected with this nomenclature. Nano-Farad, nF: Because nF or nano-Farads nomenclature was not frequently used prior to terminology standardization, this submultiple lacked a variety of abbreviations. The term nanofarad has gained in popularity in recent years, while it is still not widely used in some countries, with values given in huge numbers of picofarads, such as 1000pF for 1 nF, or fractions of a microfarad, such as 0.001 µF for a nanofarad. Ceramic capacitors, metalized film capacitors, including surface mount multilayer ceramic capacitors, and even some modern silver mica capacitors all use this terminology. Pico-Farad, pF: The value in picoFarads, pF, was again indicated using a variety of acronyms.  MicroromicroFarads, mmfd, MMFD, uff, µµFwere among the terms used. All of these numbers are in pF. Picofarad capacitor values are commonly employed in radio frequency, RF circuits, and equipment. As a result, this nomenclature is most commonly associated with ceramic capacitors, however, it is also applied to silver mica capacitors and some film capacitors. The conversion of values from one submultiple to the next has been aided by the standardization of terminology. It has resulted in a significant reduction in the potential for misunderstanding. Converting from µF to nF and pF is simpler. This is important when a capacitor value is listed in one way on a circuit diagram and another way on a list of electronic components distributors. Because different electrical component manufacturers label components differently, the capacitance conversion table is highly useful. For example, some manufacturers label their equivalent capacitors as a fraction of a microfarad, while others label them as a fraction of a nanofarad, and so on. Electrical component wholesalers and retailers will prefer to adopt the manufacturer's nomenclature. Similarly, circuit diagrams may use different symbols to represent components to maintain commonality, etc. As a result, being able to convert between picofarads, nanofarads, and microfarads, as well as vice versa, is beneficial. When the bill of materials or parts list for the circuit has values expressed in microfarads, µF, and picofarads, pF, this can aid identify components labeled in nanofarad values. It is generally useful to be able to utilize a capacitance conversion calculator like the one above, but it is also important to be familiar with the conversions and popular equivalents, such as 1000pF = nanofarad and 100nF = 0.1µF. These conversions become second nature while working with electrical components and designing electronic circuits, but the capacitance conversion tables and calculators can still be quite useful. Capacitors, as well as other electronic components like inductors, benefit from these conversions. 3.3 Frequently Asked Questions about the Capacitance of a Capacitor1. What is capacitance in simple terms?Capacitance is the ability of a system of electrical conductors and insulators to store electric charge when a potential difference exists between the conductors. Capacitance is expressed as a ratio of the electrical charge stored to the voltage across the conductors. 2.What is C in capacitance?The capacitance C is the ratio of the amount of charge q on either conductor to the potential difference V between the conductors, or simply C = q/V. 3.What is difference between capacitor and capacitance?Capacitance is nothing but the ability of a capacitor to store the energy in form of electric charge. In other words, the capacitance is the storing ability of a capacitor. It is measured in farads. 4.What is the formula of capacitor?The governing equation for capacitor design is: C = εA/d, In this equation, C is capacitance; ε is permittivity, a term for how well dielectric material stores an electric field; A is the parallel plate area; and d is the distance between the two conductive plates. 5.What four factors affect capacitance?The capacitance of a capacitor is affected by the area of the plates, the distance between the plates, and the ability of the dielectric to support electrostatic forces. Ⅳ Capacitor Conversion: µF-nF-pF  The use of the nanofarad (nF) is less common in some fields, with values stated in fractions of a µF and huge multiples of picofarads (pF). When components marked in nanofarad are available, it may be necessary to convert to nanofards, nF in these circumstances. When a circuit diagram or electronic components list mentions the value in picofarads, for example, and listings for an electronic component distributor or electronic components store state it in another way, it can be confusing. Capacitor values can be in the 109 range or even higher, thanks to the introduction of supercapacitors. The common prefixes pico (10-12), nano (10-9), and micro (10-6) are often used to avoid misunderstanding with high numbers of zeros connected to the values of different capacitors. When converting between them, a capacitor conversion chart or capacitor conversion table for the various capacitor values can be useful. Another requirement for capacitance conversion is that the actual capacitance value is reported in picofarads in some capacitor marking systems, therefore the value must be converted to the more common nanofarads or microfarads. 4.1 Capacitor Conversion ChartMicrofarads ( µF)Nanofarads(nF)Picofarads(pF)0.0000010.00110.000010.01100.00010.11000.001110000.0110100000.11001000001100010000001010000100000001001000001000000004.2 Popular Capacitor ConversionsCapacitor values can be written in a few different ways. A ceramic capacitor, for example, is frequently assigned a value of 100nF. It is often interesting to realize that this is 0.1µF when utilized in circuits with electrolytic capacitors. These handy conversions can aid in the design, construction, and maintenance of circuits. When building circuits or employing capacitors in any fashion, keeping these capacitor conversions in mind when values migrate from picofarads to nanofarads and then nanofarads to microfarads is typically beneficial. A more comprehensive table of conversion factors to convert between the different values, nF to pF, µF to nF etc is given below.Table of Conversion Factors to Convert between µF,nF and pF convertmultiply by:pF     to     nF1 x 10-3pF     to     µF1 x 10-6nF     to     pF1 x 103nF     to     µF1 x 10-3µF     to     pF1 x 106µF     to     nF1 x 103 4.3 Frequently Asked Questions about Capacitor Conversion1. Can I replace a capacitor with a higher uF?An electric motor start capacitors can be replaced with a micro-farad or UF equal to or up to 20% higher UF than the original capacitor serving the motor. 2.What happens if I use a higher uF capacitor?The higher the number of micro-farads, the more energy the capacitor can hold. In theory, if a device has a high uF, it will last longer in a power outage.3.What happens if you use the wrong size capacitor?If the wrong run capacitor is installed, the motor will not have an even magnetic field. This will cause the rotor to hesitate at those spots that are uneven. This hesitation will cause the motor to become noisy, increase energy consumption, cause performance to drop, and cause the motor to overheat. 4.Can I replace a capacitor with a lower capacitance?Yes, it's possible given the necessary skills and tools. Yes, it's safe. The only rating that matters for safety is the rated voltage: if you put a higher voltage than the maximum you might see your cap explode. 5.Can I use a run capacitor in place of a start capacitor?The capacitance and voltage ratings would have to match the original start capacitor specification. A start capacitor can never be used as a run capacitor, because it cannot not handle current continuously. Ⅴ Capacitor Color Code5.1 Capacitor Colour Code TablesWhen the capacitance value is a decimal value, problems with the marking of the "Decimal Point" arise since it is easily overlooked, leading to a misunderstanding of the real capacitance value. Instead of the decimal point, letters like p (pico) or n (nano) are used to indicate the position and weight of the number. A capacitor might be labeled as n47 = 0.47nF, 4n7 = 4.7nF, or 47n = 47nF, for example. Also, capacitors are occasionally labeled with the capital letter K to indicate a value of one thousand pico-Farads, thus a capacitor marked 100K would be 100 x 1000pF or 100nF. An International color-coding scheme was devised many years ago as a simple manner of identifying capacitor values and tolerances to reduce the confusion regarding letters, numbers, and decimal points. The Capacitor Colour Code system, which consists of colored bands (in spectral order) and whose meanings are given below, is a system that consists of colored bands (in spectral order). Band ColourDigit ADigit BMultiplier DTolerance (T) > 10pfTolerance (T) < 10pfTemperature Coefficient (TC)Black00x1± 20%± 2.0pF Brown11x10± 1%± 0.1pF-33×10-6Red22x100± 2%± 0.25pF-75×10-6Orange33x1,000± 3% -150×10-6Yellow44x10,000± 4% -220×10-6Green55x100,000± 5%± 0.5pF-330×10-6Blue66x1,000,000  -470×10-6Violet77   -750×10-6Grey88x0.01+80%,-20%  White99x0.1± 10%± 1.0pF Gold  x0.1± 5%  Silver  x0.01± 10%  Capacitor Colour Code Table Band ColourVoltage Rating (V) Type JType KType LType MType NBlack4100 1010Brown62001001.6 Red10300250435Orange15400 40 Yellow205004006.36Green25600 1615Blue35700630 20Violet50800   Grey 900 2525White31000 2.53Gold 2000   Silver     Capacitor Voltage Colour Code Table Capacitor Voltage ReferenceType J–  Dipped Tantalum Capacitors.Type K–  Mica Capacitors.Type L–  Polyester/Polystyrene Capacitors.Type M–  Electrolytic 4 Band Capacitors.Type N–  Electrolytic 3 Band Capacitors. 5.2 Color Codes of Different Capacitors 1.Metalised Polyester Capacitor  2. Disc & Ceramic Capacitor  For many years, unpolarized polyester and mica molded capacitors were coded using the Capacitor Colour Code system. Although this color coding method is no longer in use, many “old” capacitors can still be found. Small capacitors, such as film or disk kinds, now comply with the BS1852 Standard and its new replacement, BS EN 60062, which replaces the colors with a letter or number coding system. 5.3 Frequently Asked Questions about Capacitor Color Code1. What do capacitor colors mean?All the color bands painted on the capacitors body are used to indicate the capacitance value and capacitance tolerance. The color codes used to represent the capacitance values and capacitance tolerance is similar to that used to represent resistance values and resistance tolerance. 2.How do you read a capacitor code?If you have a capacitor that has nothing other than a three-digit number printed on it, the third digit represents the number of zeros to add to the end of the first two digits. The resulting number is the capacitance in pF. For example, 101 represents 100 pF: the digits 10 followed by one additional zero. 3.Which type of capacitor is available in color code?A color code was used on polyester capacitors for many years. It is now obsolete, but of course there are many still around. The colors should be read like the resistor code, the top three color bands giving the value in pF. Ignore the 4th band (tolerance) and 5th band (voltage rating). 4.Are capacitors color coded?The capacitors use a capacitor color code similar to the resistors color code (3, 4 or 5 bands). The first two colors indicate significant digits of the value of the capacity (in pF), the next colour is the corresponding power of 10, the other two colors are optional and indicate tolerance and maximum voltage. Ⅵ Capacitor Code6.1 Types of Capacitor CodeFor example, a capacitor labeled 474J should be read as 47 times the value listed in Table 1 corresponding to the third number, in this case, 10000: 47 * 10000 = 470000 pF = 470 nF = 0.47µF, with the J indicating a 5% tolerance. If a temperature coefficient is present, the second letter will be it. You'll rapidly learn to tell whether a capacitor's value is expressed in pF, nF, or µF based on its size and kind. The capacitance of a capacitor designated 2A474J is encoded as mentioned above; the two initial signs are the voltage rating, which can be decoded from table 2 below. According to the EIA standard, 2A is a 100V DC rating. Some capacitors are only marked 0.1 or 0.01, mostly in these cases the values are given in µF. Some small capacitance capacitors contain an R between the numbers, such as 3R9, which indicates that the value is less than 10pF and has nothing to do with resistance. 3R9 has a 3.9pF value. Table 1 – Capacitor codes with letters and tolerances3rd numberMultiply withLetterTolerance01D0.5pF110F1%2100G2%31,000H3%410,000J5%5100,000K10%61,000,000M20%7Not usedM20%80.01P+100%/-0%90.1Z+80%/-20% Table 2A – Electronic Industries Alliance (EIA) – DC voltage code table0E = 2.5 VDC2A = 100 VDC3A = 1 kVDC0G = 4.0 VDC2Q = 110 VDC3L = 1.2 kVDC0L = 5.5 VDC2B = 125 VDC3B = 1.25 kVDC0J = 6.3 VDC2C = 160 VDC3N = 1.5 kVDC1A = 10 VDC2Z = 180 VDC3C = 1.6 kVDC1C = 16 VDC2D = 200 VDC3D = 2 kVDC1D = 20 VDC2P = 220 VDC3E = 2.5 kVDC1E = 25 VDC2E = 250 VDC3F = 3 kVDC1V = 35 VDC2F = 315 VDC3G = 4 kVDC1G = 40 VDC2V = 350 VDC3H = 5 kVDC1H = 50 VDC2G = 400 VDC3I = 6 kVDC1J = 63 VDC2W = 450 VDC3J = 6.3 kVDC1M = 70 VDC2J = 630 VDC3U = 7.5 kVDC1U = 75 VDC2I = 650 VDC3K = 8 kVDC1K = 80 VDC2K = 800 VDC  Table 2B – Electronic Industries Alliance (EIA) – AC voltage code table2Q = 125 VAC2T = 250 VAC2S = 275 VAC2X = 280 VAC2F = 300 VACI0 = 305 VACL0 = 350 VAC2Y = 400 VACP0 = 440 VACQ0 = 450 VACV0 = 630 VAC  Table 3 – Capacitor code tablepico-farad (pF)nano-farad (nF)micro-farad (µF) Capacitor Code1 pF capacitor code0.001 nF capacitor code0.000001 µF capacitor code101.5 pF capacitor code0.0015 nF capacitor code0.0000015 µF capacitor code1R52.2 pF capacitor code0.0022 nF capacitor code0.0000022 µF capacitor code2R23.3 pF capacitor code0.0033 nF capacitor code0.0000033 µF capacitor code3R33.4 pF capacitor code0.0039 nF capacitor code0.0000039 µF capacitor code3R93.5 pF capacitor code0.0047 nF capacitor code0.0000047 µF capacitor code4R75.6 pF capacitor code0.0056 nF capacitor code0.0000056 µF capacitor code5R66.8 pF capacitor code0.0068 nF capacitor code0.0000068 µF capacitor code6R88.2 pF capacitor code0.0082 nF capacitor code0.0000082 µF capacitor code8R210 pF capacitor code0.01 nF capacitor code0.00001 µF capacitor code10015 pF capacitor code0.015 nF capacitor code0.000015 µF capacitor code15022 pF capacitor code0.022 nF capacitor code0.000022 µF capacitor code22033 pF capacitor code0.033 nF capacitor code0.000033 µF capacitor code33047 pF capacitor code0.047 nF capacitor code0.000047µF capacitor code47056 pF capacitor code0.056 nF capacitor code0.000056 µF capacitor code56068 pF capacitor code0.068 nF capacitor code0.000068 µF capacitor code68082 pF capacitor code0.082 nF capacitor code0.000082 µF capacitor code820100 pF capacitor code0.1 nF capacitor code0.0001 µF capacitor code101120 pF capacitor code0.12 nF capacitor code0.00012 µF capacitor code121130 pF capacitor code0.13 nF capacitor code0.00013µF capacitor code131150 pF capacitor code0.15 nF capacitor code0.00015 µF capacitor code151180 pF capacitor code0.18 nF capacitor code0.00018 µF capacitor code181220 pF capacitor code0.22 nF capacitor code0.00022 µF capacitor code221330 pF capacitor code0.33 nF capacitor code0.00033 µF capacitor code331470 pF capacitor code0.47 nF capacitor code0.00047 µF capacitor code471560 pF capacitor code0.56 nF capacitor code0.00056 µF capacitor code561680 pF capacitor code0.68 nF capacitor code0.00068 µF capacitor code681750 pF capacitor code0.75 nF capacitor code0.00075 µF capacitor code751820 pF capacitor code0.82 nF capacitor code0.00082 µF capacitor code8211000 pF capacitor code1 / 1n / 1 nF capacitor code0.001 µF capacitor code1021500 pF capacitor code1.5 / 1n5 / 1.5 nF capacitor code0.0015 µF capacitor code1522000 pF capacitor code2 / 2n / 2 nF capacitor code0.002 µF capacitor code2022200 pF capacitor code2.2 / 2n2 / 2.2 nF capacitor code0.0022 µF capacitor code2223300 pF capacitor code3.3 / 3n3 / 3.3 nF capacitor code0.0033 µF capacitor code3324700 pF capacitor code4.7 / 4n7 / 4.7 nF capacitor code0.0047 µF capacitor code4725000 pF capacitor code5 / 5n / 5 nF capacitor code0.005 µF capacitor code5025600 pF capacitor code5.6 / 5n6 / 5.6 nF capacitor code0.0056 µF capacitor code5626800 pF capacitor code6.8 / 6n8 / 6.8 nF capacitor code0.0068 µF capacitor code68210000 pF capacitor code10 / 10n / 10 nF capacitor code0.01 µF capacitor code10315000 pF capacitor code15 / 15n / 15 nF capacitor code0.015 µF capacitor code15322000 pF capacitor code22 / 22n / 22 nF capacitor code0.022 µF capacitor code22333000 pF capacitor code33 / 33n / 33 nF capacitor code0.033 µF capacitor code33347000 pF capacitor code47 / 47n / 47 nF capacitor code0.047 µF capacitor code47368000 pF capacitor code68 / 68n / 68 nF capacitor code0.068 µF capacitor code683100000 pF capacitor code100 / 100n / 100 nF capacitor code0.1 µF capacitor code104150000 pF capacitor code150 / 150n / 150 nF capacitor code0.15 µF capacitor code154200000 pF capacitor code200 / 200n / 200 nF capacitor code0.20 µF capacitor code204220000 pF capacitor code220 / 220n / 220 nF capacitor code0.22 µF capacitor code224330000 pF capacitor code330 / 330n / 330nF capacitor code0.33 µF capacitor code334470000 pF capacitor code470 / 470n / 470nF capacitor code0.47 µF capacitor code474680000 pF capacitor code680 nF capacitor code0.68 µF capacitor code6841000000 pF capacitor code1000 nF capacitor code1.0 µF capacitor code1051500000 pF capacitor code1500 nF capacitor code1.5 µF capacitor code1552000000 pF capacitor code2000 nF capacitor code2.0 µF capacitor code2052200000 pF capacitor code2200 nF capacitor code2.2 µF capacitor code2253300000 pF capacitor code3300 nF capacitor code3.3 µF capacitor code3354700000 pF capacitor code4700 nF capacitor code4.7 µF capacitor code4756800000 pF capacitor code6800 nF capacitor code6.8 µF capacitor code68510000000 pF capacitor code10000 nF capacitor code10 µF capacitor code10615000000 pF capacitor code15000 nF capacitor code15 µF capacitor code15620000000 pF capacitor code20000 nF capacitor code20 µF capacitor code20622000000 pF capacitor code22000 nF capacitor code22 µF capacitor code22633000000 pF capacitor code33000 nF capacitor code33 µF capacitor code33647000000 pF capacitor code47000 nF capacitor code47 µF capacitor code47668000000 pF capacitor code68000 nF capacitor code68 µF capacitor code686100000000 pF capacitor code100000 nF capacitor code100 µF capacitor code107330000000 pF capacitor code330000 nF capacitor code330 µF capacitor code337470000000 pF capacitor code470000 nF capacitor code470 µF capacitor code477680000000 pF capacitor code680000 nF capacitor code680 µF capacitor code6871000000000 pF capacitor code1000000 nF capacitor code1000 µF capacitor code1086.2 Frequently Asked Questions about Capacitor Code1. What is the code of a capacitor?Generally, the actual values of Capacitance, Voltage or Tolerance are marked onto the body of the capacitors in the form of alphanumeric characters. For example, a capacitor can be labeled as, n47 = 0.47nF, 4n7 = 4.7nF or 47n = 47nF and so on. 2.What does the numbers on a capacitor mean?The first two numbers represent the value in picofarads, while the third number is the number of zeroes to be added to the first two. For example, a 4.7 μF capacitor with a voltage rating of 25 volts would bear the marking E476. 3.What is the value of a capacitor?Capacitor values can be of over 109 range, and even more as super capacitors are now being used. To prevent confusion with large numbers of zeros attached to the values of the different capacitors the common prefixes pico (10 -12 ), nano (10 -9) and micro (10 -6) are widely used. 4.How can you determine the value of a capacitor?The value of capacitors can be determined by several ways depending up on the type of capacitor like electrolytic, disc, film capacitors, etc. These methods include value or number printed on the body of the capacitor or color coding of the capacitor. 5.How can I determine the capacitance of an unknown capacitor?To determine an unknown capacitance using an oscilloscope , a dc power source such as a 9-V battery, a known resistance, a switch and the capacitor are all connected in series. An oscilloscope probe tip and ground lead are connected across the capacitor. Additionally, you need a short wire jumper to shunt across the capacitor. Ⅶ Capacitor Code Calculator7.1 Capacitor Safety Discharge Calculator ToolThis Capacitor Safety Discharge Calculator helps to determine the discharge rate of a capacitor at known capacitance and charge through a fixed-value resistor. Enter the initial voltage, time, resistance, and capacitance into the calculator. The calculator will display the total voltage discharged and remaining. Many factors need to be considered when choosing a discharge resistor. Safety standards require the voltage across a capacitor to reach a safe voltage before a person is able to touch it. In the USA, standards such as UL, OSHA, NTA, ETL, MET, etc. will have the requirements available for the needs of your product.Capacitor Safety Discharge Calculator Tool 7.2 Series and Parallel Capacitance CalculatorThis tool calculates the overall capacitance value for multiple capacitors connected either in series or in parallel.Series and Parallel Capacitance Calculator 

Ⅰ IntroductionA Colpitts oscillator is one of several designs for LC oscillators, which employ a combination of inductors (L) and capacitors (C) to produce an oscillation at a specific frequency. It was invented in 1918 by American engineer Edwin H. Colpitts. The voltage divider made up of two capacitors in series across the inductor serves as feedback for the active device in the Colpitts oscillator.   CatalogⅠ IntroductionⅡ What a Colpitts Oscillator Contains?Ⅲ How the Colpitts Oscillator Works?Ⅳ Colpitts Oscillator vs Hartley OscillatorⅤ Types of Colpitts Oscillator5.1 Common Base Colpitts Oscillator5.2 Common Emitter Colpitts Oscillator5.3 Buffered Colpitts OscillatorⅥ Advantages of Colpitts OscillatorⅦ Applications of Colpitts OscillatorⅧ ConclusionⅨ Frequently Asked Questions about Colpitts OscillatorⅡ What a Colpitts Oscillator Contains?The Colpitts circuit, like other LC oscillators, is made up of a gain device (such as a bipolar junction transistor, field-effect transistor, operational amplifier, or vacuum tube) with its output connected to its input in a feedback loop containing a parallel LC circuit (tuned circuit) that serves as a bandpass filter to set the oscillation frequency. The amplifier's input and output impedances will be different, and these must be linked into the LC circuit without overdamping it. Ⅲ How the Colpitts Oscillator Works?The Colpitts oscillator is commonly used in RF applications, with a frequency range of 20KHz to 300MHz. The capacitive voltage divider configuration in the tank circuit serves as the feedback source in the Colpitts oscillator, and this arrangement provides superior frequency stability than the Hartley oscillator, which uses an inductive voltage divider system for feedback. The circuit diagram of a typical transistor-based Colpitts oscillator is shown below. Colpitts oscillator The resistors R1 and R2 in the circuit schematic provide a voltage divider biasing for the transistor. The transistor's collector current is limited by the resistor R4. The input DC decoupling capacitor is Cin, and the output decoupling capacitor is Cout. The emitter resistor, Re, is used to ensure thermal stability. The emitter by-pass capacitor is denoted by Ce. The emitter by-pass capacitor's job is to keep the amplified AC signals from crossing Re. If the emitter by-pass capacitor is missing, the amplified AC signal will drop across Re, causing the transistor's DC biasing conditions to change, resulting in lower gain. The tank circuit is made up of capacitors C1, C2, and inductor L1. Tank circuit in a Colpitts oscillator When the power source is turned on, the capacitors C1 and C2 begin to charge. They start discharging through the inductor L1 when they are completely charged. The electrostatic energy stored in the capacitors is transmitted to the inductor as magnetic flux when the capacitors are fully drained. The inductor begins to discharge and the capacitors are re-charged. Oscillation is caused by energy being transferred back and forth between capacitors and inductors. The voltage across C2 is in phase opposite that of C1, and the voltage across C2 is sent back to the transistor. The enhanced feedback signal at the transistor's base emerges across the collector and emitter. The transistor compensates for the energy lost in the tank circuit, maintaining the oscillations. One 180° phase shift is produced by the tank circuit, and the other 180° phase shift is produced by the transistor. That means the input and output are in phase, and positive feedback requires to keep oscillations going for long periods. The equation below can be used to calculate the frequency of the Colpitts oscillator's oscillations. Where L is the inductance of the tank circuit's inductor and C is the effective capacitance of the tank circuit's capacitors. The effective capacitance of the serial combination C= (C1C2)/(C1+C2) if C1 and C2 are independent capacitances. The Colpitts oscillator can be made variable by utilizing ganged variable capacitors in place of C1 and C2. Ⅳ Colpitts Oscillator vs Hartley OscillatorThe Colpitts oscillator is extremely similar to the Hartley oscillator, however they are constructed differently. The Colpitts oscillator employs a single inductor in parallel with two capacitors in series, whereas the Hartley oscillator utilizes the exact opposite, one single capacitor in parallel with two inductors in series. In high-frequency operation, the Colpitts oscillator is more stable than the Hartley oscillator. Colpitts Oscillator vs Hartley Oscillator In high-frequency operation, the Colpitts oscillator is an ideal choice. It can generate output frequencies in the Megahertz and Kilohertz ranges. Ⅴ Types of Colpitts Oscillator5.1 Common Base Colpitts OscillatorA typical Colpitts oscillator design is shown below. The Colpitts LC tank circuit operates similarly to the Hartley oscillator, however it only has a single inductor and two capacitors. Instead of the tapped inductor used in the Hartley, the capacitors create a single 'tapped' capacitor. The total capacitance in series (CTOT) of the two capacitors (connected in series) is calculated as follows: common base Colpitts oscillator The total capacitance required for the tank circuit to achieve parallel resonance at the specified frequency is given. The oscillation frequency is calculated using the same formula as the Hartley oscillator. However, in this case, the number C is the sum of the values C2 and C3 in order (CTOT). C2 and C3's values are chosen so that their ratio delivers the required proportion of feedback signal. The ratio of voltages across two capacitors in series, on the other hand, is inversely proportional to the ratio of their values, implying that the smaller capacitor has a higher signal voltage across it. The fundamental advantage of the Colpitts design is that the single inductor in the tuned circuit eliminates any mutual inductance between two coils, where the alternating magnetic field generated up around one inductor drives a current into the inductor of the other coil. This alters the resonance frequency of the tuned circuit by changing the total inductance of the coils. 5.2 Common Emitter Colpitts OscillatorThe Colpitts analog of the Common Emitter Hartley Oscillator is shown below.                              common emitter Colpitts oscillator It employs a common emitter amplifier, and because the tuned (tank) circuit tapping point is connected to the ground in this design, the tank circuit generates anti-phase waves at the top and bottom of L2, ensuring proper phase relationships for positive feedback between collector and base. The feedback is delivered to the base via C1, which also functions as a DC block, preventing the greater voltage on L1 from causing the base bias voltage to be thrown off. The supply rail (+Vcc) is connected to the tank circuit (L2, C2, and C3) through L1. Because the DC supply is significantly decoupled by huge capacitors in the DC Power supply, if the tank circuit were connected directly to the supply, there would be no anti-phase AC signal present at the top of the tank circuit. As a result, between the tuned circuit and the supply, an RF choke (L1) with a high impedance at the oscillation frequency is provided. This permits the development of a signal voltage across L1 for feedback purposes. Automatic class C bias is utilized, with the emitter only partially disconnected by a small amount of C5 to provide the previously mentioned "slide bias." The Colpitts oscillator, like the Hartley, can produce an excellent sine wave shape and has the added benefit of improved stability at very high frequencies. It's easy to spot because it's always got a "tapped capacitor" on it. The fact that any load placed on the output by circuits that the output is supplying essentially inserts a dampening resistance across the tank circuit complicates the design of a sine wave oscillator. This can have an adverse influence on both the wave shape and frequency stability of the oscillator waveform, as well as lowering the amplitude of the oscillator output by lowering the Q factor of the tuned tank circuit. 5.3 Buffered Colpitts OscillatorAs demonstrated below, feeding the oscillator output into an emitter follower buffer amplifier is a standard technique. buffered Colpitts oscillator TR1's load impedance has been changed to the RF choke, and the tank circuit is now isolated from TR1 by two DC blocking capacitors, C1 and C4. As a result, instead of a tuned amplifier, this variant of the Colpitts oscillator uses a tuned feedback channel. The emitter follower stage (R4, TR2 and R5) has a very high input impedance, which has no effect on the oscillator, and a very low output impedance, which allows it to drive loads with impedances as low as a few tens of ohms. Variations in supply voltage can also affect the frequency stability of oscillators. When good frequency stability is required, it is typical to use a stabilized power supply. Extra decoupling capacitors may be required for oscillator supplies to reduce undesired 'noise.' Automatic class C bias, which is given in this circuit by only partially disconnecting the emitter of TR1 by C5, is generally used to achieve stable amplitude. Ⅵ Advantages of Colpitts OscillatorThe Colpitts oscillator may produce very high-frequency sinusoidal pulses.It can tolerate extreme heat and cold.There is a lot of frequency stability.Both variable capacitors can be used to change the frequency.A small number of components is all that is required.Over a certain frequency range, the output amplitude remains constant.The Colpitts oscillator was created to address the shortcomings of the Hartley oscillator and is known to have no unique flaws. As a result, a Colpitts oscillator has a wide range of uses. Ⅶ Applications of Colpitts OscillatorThe Colpitts oscillator is mostly employed for fixed frequency generation due to the challenges in achieving a smooth variation of inductor and capacitor.The Colpitts oscillator is most commonly found in mobile phones and other radio frequency-controlled communications devices.The Colpitts oscillator is a great choice for high-frequency oscillation. Colpitts Oscillator is used in high-frequency oscillator-based systems.Colpitts Oscillator is utilized in a few applications where continuous and undamped oscillation is required as well as thermal stability.For applications that require a broad range of frequencies with minimal noise.Colpitts oscillator is used in a variety of SAW-based sensors.The Colpitts oscillator is used in a variety of metal detectors.A Colpitts oscillator is used in frequency modulation radio frequency transmitters.It has a wide range of uses in both military and commercial items.Signal masking-related chaotic circuits are also required in microwave applications Colpitts oscillator in various frequency ranges. Ⅷ ConclusionTo summarise, the Colpitts Oscillator consists of a parallel LC resonator tank circuit whose feedback is achieved by way of a capacitive divider. The Colpitts oscillator exists in several forms like most oscillator circuits, and the most common form is the transistor circuit. The tank sub-center circuit's tap is made at the junction of a "capacitive voltage divider" network, which feeds a fraction of the output signal back to the transistor's emitter. The 180o phase shift produced by the two capacitors in series is inverted by another 180o to produce the requisite positive feedback. The resonance frequency of the tank circuit determines the oscillation frequency, which is a purer sine-wave voltage. Ⅸ Frequently Asked Questions about Colpitts Oscillator1.What is the use of Colpitts oscillator?It is used for generation of sinusoidal output signals with very high frequencies. The Colpitts oscillator using SAW device can be used as the different type of sensors such as temperature sensor. As the device used in this circuit is highly sensitive to perturbations, it senses directly from its surface. 2.What is the basic principle of oscillator?There are many types of electronic oscillators, but they all operate according to the same basic principle: an oscillator always employs a sensitive amplifier whose output is fed back to the input in phase. Thus, the signal regenerates and sustains itself. This is known as positive feedback. 3.What is meant by Colpitts oscillator?A Colpitts oscillator, invented in 1918 by American engineer Edwin H. Colpitts, is one of a number of designs for LC oscillators, electronic oscillators that use a combination of inductors (L) and capacitors (C) to produce an oscillation at a certain frequency. 

ⅠIntroduction Resistor is commonly used in our daily life. There are all kinds of resistor in a vehicle. As we know ,the air conditioning is very important for a car . One of the most essential components is blower motor resistor. This article embodies basic knowledge about blower motor resistor.Figure1： the location of Blower Motor Resistor ⅠIntroductionⅡDefinition and Function of Blower Motor Resistor2.1 Definition of Blower Motor Resistor2.2 Function in a CarⅢ How the Blower Motor Resistor Works？Ⅳ Symptons of Faulty Blower Motor ResistorⅤ Blower Motor Resistor TestⅥ How to Replace Blower Motor Resistor6.1 DIY Jobs Related to the Blower Motor Resistor6.2 Details of Replacing Blower Motor ResistorⅦ Frequently Question Asked about Blower Motor Resistor ⅡDefinition and Function of Blower Motor Resistor 2.1 Definition of Blower Motor ResistorThe heating and air conditioning system in your vehicle is made up of many parts that work together to produce the desired air temperature. Some of these parts will (hopefully) last the life of your vehicle, but others will wear out and need to be replaced.The blower motor resistor is a small electrical component that, if it fails, can cause noticeable problems with the air in the passenger compartment. Understanding how it works can assist you in identifying the symptoms of a faulty resistor.This vedio shows a circuit of a blower motor  2.2 Function in a CarA blower motor is a device that drives the fan in a car's heating and air conditioning system. It's usually found inside the dash, on the opposite side of the steering wheel, or on the firewall inside the engine compartment. A blower motor resistor, also known as a blower motor control module, is the component that regulates the speed of the blower motor.An electronic blower motor control module is fixed in cars with automatic climate control systems and vehicles where the blower speed can be gradually adjusted.  Figure2: the control module The blower motor resistor or control module is usually installed inside one of the ducts in the HVAC system, close to the blower motor, in most modern vehicles. This is done so that the resistor or control module can be cooled by passing air. A blower motor resistor was installed on the firewall of some older vehicles, with access from under the hood. Ⅲ How the Blower Motor Resistor Works？Blower motor resistor diagram depicts how the blower motor resistor is connected in a typical automobile. The resistor is bypassed in this car at the highest "4" fan speed setting, and the blower motor is powered directly by the fan switch. As a result, even if the resistor is faulty, the blower motor in some vehicles may continue to operate at a "High" speed.The fan switch is set to "1" in this diagram, so the blower motor current is reduced by three resistors (R2 + R3 + R4) connected in series. The flow of current is depicted in blue and red.Two resistors are connected in series when the setting is 2.  Whereas, in setting "3," there is only one resistor. When resistance is added to an electric circuit, the current in the circuit is reduced. When multiple resistors are connected in series, the total resistance rises and equals the sum of the individual resistances. Figure3: how the blower motor resistor works  Ⅳ Symptons of Faulty Blower Motor ResistorA faulty blower motor resistor can disrupt the operation of the entire heating and cooling system. A bad or failing blower motor resistor will usually cause a few symptoms that will alert the driver to a potential problem. It is critical to understand the symptoms of a faulty motor resistor. 1. The blower motor is stuck at one speed.A blower motor that is stuck on one setting is a common symptom of a faulty blower motor resistor. The blower motor resistor is the component directly responsible for controlling the fan speed of the blower motor. If the resistor shorts or fails, the blower motor may become stuck at one fan speed. The heating and air conditioning systems may continue to operate at one speed, but the resistor has to be replaced before full functionality can be restored. 2. The blower motor does not operate in certain settings.A blower motor that does not function in certain settings is another common symptom of a faulty blower motor resistor. If the internal components of the blower motor resistors fail, the blower motor may malfunction or not function at all on one or more of the settings. Perhaps, a faulty blower motor switch can lead to the same situation, so a proper diagnosis is highly recommended if you are unsure of the problem. 3.There is no air coming from the vehicle's vents.Another sign of a faulty blower motor resistor is the absence of any air from the vehicle's vents. Power to the blower motor is routed through the blower motor resistor, so if it fails or has any problems, power to the motor can be cut off. A blower motor that is not powered will not have the capacity to produce any air pressure, leaving the heating and air conditioning system with no air coming from the vents.Because the blower motor resistor is the component directly responsible for powering the blower motor, when it fails, dangerous problems with the blower motor and the heating and air conditioning system can occur. If your vehicle exhibits any of the symptoms listed above, or you suspect that your blower motor resistor is malfunctioning, have it inspected by a professional technician, such as one from YourMechanic, to determine if the component needs to be replaced. Ⅴ Blower Motor Resistor TestFirstly, if the blower motor does not work at all, it is necessary to test the motor. When the blower motor is turned on, the voltage at the blower motor connector is typically measured. If there is a voltage at the motor (at least 4-6 Volts at low speed and 12 Volts at high speed), but the motor does not run, the motor is defective or jammed. Voltage testing of the blower motor The voltage at the blower motor is being tested. If there is a voltage at the motor (at least 4-6 Volts at low speed and 12 Volts at high speed), but the motor does not run, the motor is defective.Figure4: how to test the blower motor resistor Leaves, twigs, nuts, and pieces of a ripped cabin filter can jam the blower motor's blade. This is a common occurrence in many automobiles.The entire blower motor circuit, beginning with a fuse, has to be tested if the motor is in the case of no voltage. See also: how to test a fuse in a car.If a blower motor fails, it must be replaced. Depending on the vehicle, the cost of replacing the blower motor ranges from $320 to $650. In many cars, the blower motor is located behind the glove box and is held in place by 3-4 screws. In others, it may be located inside the dash (as in the Mazda 5), making replacement difficult. Ⅵ How to Replace Blower Motor Resistor6.1 DIY Jobs Related to the Blower Motor ResistorWhile you're under the hood working around the HVAC housing, here are some related tasks you should complete for preventative maintenance or to avoid future HVAC system problems.Take out and clean the blower motor fan.Replace the cabin air filter. Figure5: the blower fan 6.2 Details of Replacing Blower Motor ResistorThe following are the simple steps to replacing a blower motor resistor: 1.Locate the Blower Motor ResistorObviously, the first thing you had better do is locate the blower motor resistor so that you determine which component will be taken out. It is directly next to the blower motor. The latter, on the other hand, is commonly found underneath the passenger side dash or in the engine compartment. 2.Take out the Blower Motor ResistorRemove the blower motor resistor now that you know where it is. To begin, remove the components surrounding the blower motor resistor, including the pigtail connected to the AC and the blower motor cooling duct. You can now easily access the blower motor resistor at this point.All that remains is to unscrew the bolts that hold the blower motor resistor in place. Using a ratchet with a short extension, tighten the screw. Once the bolts are taken out, all that remains is to remove the blower motor resistor. 3.Disconnect the WiresAfter removing the blower motor resistor, cut the wires that connect to the component. Cut the wires with a stripper or scissors designed for cutting through wires. 4.Install the New Blower ResistorApply dielectric grease to the housing of the blower motor resistor before proceeding with the installation. It will keep water out of the vehicle, which is a common issue when driving off-road. Apply a coating around the plastic to create a seal that will protect the component.Replace the blower motor resistor in the same location where it was previously removed. Replace the screws to secure them in place. Connect the pigtail when you are finished with the job. However, there are some cases in which the pigtail has already worn out. Proceed to the next step if this is the case.Disconnect the old wires and reconnect the new ones. Because the wires are probably color-coded, this should be simple. Connect the new wires with the connectors. Return the pigtail to its original position, and you fulfill the task.Ⅶ Frequently Question Asked about Blower Motor Resistor1.What does a resistor do for a blower motor?Blower resistors are resistors which are used to control the fan speed of automotive blowers. The fan speed can be changed either by switching the blower resistor resistance mechanically using a rotating lever, or electronically by the air conditioning system. 2.Why do blower motor resistors fail?In most cases, a blower motor resistor fails due to corrosion or overheating. Sometimes, the mechanical resistance to the motor rotation causes an excessive electric current that can overheat and prematurely damage the blower motor resistor. 3.Can you fix a blower motor resistor?The resistor module is easy and inexpensive to replace. It's then typically installed in the ductwork, near the car blower—either under the dash or under the hood. (Refer to a service manual to locate yours.) Purchase a new resistor module at the auto parts store (usually less than $25). 4.Can you drive with a bad blower motor?A bad heater blower motor will not affect the safety of your car, with the possible exception of you not being able to clear the windshield of snow, ice, or condensation if the defrosters don't work. But you won't be comfortable inside your car, especially during the cold of winter and the heat of summer. 5.How do I know if my blower motor has power?Check for power at the motor itself. Using a test light or a multimeter set on volts, unplug the blower motor. Keeping the black lead on a good ground, usually a bolt on the engine block, and the blower switch turned on, use the red lead to probe the plug that usually attaches to the blower motor.  

Ⅰ What is a Crankshaft Position SensorⅡ Function and Location of Crankshaft Position SensorsⅢ How does a Crankshaft Position Sensor WorkⅣ Symptoms of a Bad Crankshaft Position Sensor4.1 Engine Vibrations4.2 Check Engine Light4.3 Weak Engine Performance4.4 Trouble Starting Car4.5 Engine Stalling4.6 Cylinder MisfiringⅤ How to Replace a Crankshaft Position SensorⅥ Frequently Asked Questions about Crankshaft Position Sensor Ⅰ What is a Crankshaft Position SensorThe engine, together with its components such as the crankshaft position sensor, is one of the most critical aspects of your car. Internal combustion engines are found in almost all modern cars. The crankshaft position sensor is responsible for keeping track of the engine's many moving parts, such as the crankshaft, valves, and pistons. It keeps track of the crankshaft's position and rotational speed, sending the data to the engine management unit so it can make modifications based on operating conditions. Engine management systems employ this information to govern fuel injection, ignition system timing, and other engine characteristics. On petrol engines, the distributor had to be manually set to a timing mark before electronic crank sensors were available. Video. Crankshaft Position Sensor Testing and Replacement Ⅱ Function and Location of Crankshaft Position SensorsThe crankshaft position sensor's primary function is to determine the crank's position or rotational speed (RPM). The information sent by the sensor is used by Engine Control Units to control factors like ignition and fuel injection timing. The sensor will control the fuel injection in a diesel engine. The sensor output may also be linked to other sensor data, such as the cam position, to determine the current combustion cycle, which is critical for a four-stroke engine's beginning. Figure1. Location of Crankshaft Position Sensor The crankshaft position sensor can be found in different places depending on the vehicle. It needs to be close to the crankshaft, therefore it's usually found on the engine's front underbelly. The timing cover is often where you'll find it mounted. It may be positioned on the engine's back or side. The clutch flywheel speed is sometimes used to determine the crankshaft speed using the crankshaft position sensor. The sensor is attached to the transmission's bell housing in these circumstances. Ⅲ How does a Crankshaft Position Sensor WorkThe teeth on the reduction ring attached to the crankshaft pass near to the sensor tip on the crankshaft position sensor. One or more teeth are missing from the reduction ring, which serves as a reference point for the engine computer (PCM). The sensor generates a pulsed voltage signal when the crankshaft spins, with each pulse corresponding to a tooth on the reduction ring. With the engine idling, the photo below displays the actual signal from the crankshaft position sensor. As you can see from the graph, the reduction ring in this vehicle has two missing teeth. Figure2. How a Crankshaft Position Sensor Works The PCM uses the signal from the crankshaft position sensor to determine when and in which cylinder to fire the spark. The signal from the crankshaft position is also utilized to check for misfires in any of the cylinders. There will be no spark and the fuel injectors will not operate if the sensor signal is missing. Magnetic sensors with a pick-up coil that produce A/C voltage and Hall-effect sensors that produce a digital square wave signal, as shown in the photo above, are the two most prevalent varieties. Hall-effect sensors are used in modern automobiles. A two-pin connector is found on a pick-up coil sensor. A three-pin connector is used to connect the Hall-effect sensor (reference voltage, ground, and signal). Figure3. Crankshaft position sensor signal Ⅳ Symptoms of a Bad Crankshaft Position SensorCrankshaft speed and position are critical elements in engine management calculations, and many engines will not start if the crankshaft position sensor does not provide an accurate signal. A malfunctioning crankshaft position sensor usually causes a few symptoms that alert the driver to a potential problem that needs to be addressed. 4.1 Engine Vibrations Figure4. Engine Vibrations Vibrations originating from the engine are another indicator of a malfunctioning crankshaft position sensor. Some people believe that when the engine is running, there is always some vibration emanating from under the hood. If you observe a significant increase in vibration, it could be due to an issue with the crankshaft position sensor. This vibration is frequently accompanied by a significant reduction in fuel economy and power. To get where you need to go, you'll need a lot more power and gas. 4.2 Check Engine Light Figure5. Check Engine Light The crankshaft position sensor is constantly communicated with by the engine control unit. If there is ever a problem with the sensor, the computer will receive incorrect information about the crankshaft's speed and location. This will cause engine malfunctions, resulting in the Check Engine warning light on the dashboard turning on. One of the first signs of a malfunctioning crankshaft position sensor should be this. P0335 is a typical error code that may appear. 4.3 Weak Engine Performance Figure6. Weak Engine Performance Your engine control unit will not know the right position of the crankshaft or cylinders if the crankshaft position sensor is damaged. This will cause the control unit's ability to maintain the engine's functioning and performance to be delayed. During this time, there will be moments of hesitancy every time you press harder on the gas pedal. It may or may not respond at all. On a road where you must move quicker without hesitating, this can be quite risky. 4.4 Trouble Starting Car Figure7. Trouble Starting Car Another major warning flag is that you are having trouble starting your vehicle. When you try to start your car, the crankshaft position sensor immediately starts measuring the crankshaft's position and speed. It receives a specific malfunction code from the sensor, indicating that there is an issue with its operation. When you try to start your vehicle while this problem is present, the engine will be more difficult to start. You may not be able to start your engine at all if the problem persists. 4.5 Engine Stalling Figure8. Engine Stalling One day, you may be cruising along when your engine suddenly stops running. When you have a defective crankshaft position sensor, this is known as engine stalling, and it can happen very frequently. If this sensor is not replaced soon, your engine will eventually stop working. You'll have no choice but to have your car towed to a repair to have the sensor changed. 4.6 Cylinder Misfiring Figure9. Cylinder Misfiring If the crankshaft position sensor fails, the engine control unit will not be able to reliably communicate data about the piston position. A misfire in one or more of the chamber cylinders is common as a result of this. A faulty spark plug can also cause this, but if you're experiencing any of these additional symptoms, don't discount out a bad crankshaft position sensor. Ⅴ How to Replace a Crankshaft Position SensorStart by looking for the sensor, which you can do by inspecting the engine and looking for any sensor that matches the new sensor you just bought at the lower level. Materials:shop lightcarburetor cleanerplastic clipcleaner Tools:small wrench or socketsmall pick or standard screwdriver Step1 Disconnect the BatteryIt's a good idea to disconnect the battery whenever you're working on the engine's inner workings to avoid a short circuit in the car's electrical system. Remove the disarm plug for the main battery pack on hybrid vehicles as well. The location can be found in your owner's manual. Figure10. Disconnect the Battery Step2 Clear Access to the SensorThis crank sensor is located behind the starter motor, which must be removed to access the sensor. When working beneath the car, use a shop light to see what you're doing. Figure11. Clear Access to the Sensor Step3 Inspect the Sensor LocationBecause of the transmission cooling lines, this sensor is difficult to notice, although it is located on the side of the block with the electrical connector attached. If the crankshaft angle sensor is oily, this is a good opportunity to clean it out with a small bit of carburetor cleaner to get a fresh start on the work. Figure12. Inspect the Sensor Location Step4 Release the Electrical ConnectorA plastic clip will hold an electrical hookup to the sensor, which you must push down or pull outward to disengage. Wiggle the connector away from the sensor gently once this is done. This connector can become stuck due to the weather pack seal, which helps keep water out of the sensor terminals, causing corrosion. After removing the connector, inspect it for rust and clean or replace the pigtail if necessary. The engine will stall due to this issue alone. Figure13. Release the Electrical Connector Step5 Remove the Sensor Mount BoltThe majority of crankshaft sensors only have one mounting bolt, which is usually a 10mm bolt. Remove the bolt with a tiny wrench or socket by rotating it counterclockwise and storing it to the side. Figure14. Remove the Sensor Mount Bolt Step6 Remove the SensorBecause the crank sensor has a long stem that can get jammed in the block, removing it can be difficult. To push the sensor mounting tab away, insert a small pick or a regular screwdriver beneath it. Applying too much pressure on these sensors can lead them to break, leaving a piece of the sensor inside the block. When this happens, you can either press the broken piece inward so it falls into the oil pan and stays there, or you can remove the oil pan and remove the broken piece. Figure15. Remove the SensorOnce the sensor is free, take a firm grip on it and twist it away from the engine block. On the sensor, there will be a sealing O ring that will need to be replaced with the new sensor. A new O ring is included with most new sensors. Figure16. Old Crankshaft Position Sensor Step7 Match the New Crankshaft SensorWipe away any grease from the old sensor so you can notice any design differences in the new sensor. When installing new sensors, such as mounting tabs, minor design adjustments are common. The length of the sensor stem can be variable because if it is too long, it will contact the crankshaft, and if it is too short, it will not read accurately. Figure17 .Match the New Crankshaft Sensor Step8 Installing the New Crank Position SensorClean the position sensor porthole with a shop towel before inserting the new sensor to ensure a proper seal to the new sensor O ring. Because there will be motor oil in this port, do not spray carburetor cleaning within it. To help with the cleaning, spray cleaner on the shop towel. Figure18. Sensor Port Place the new crank sensor in the sensor port hole squarely and firmly while matching the mounting plate hole with the threaded bolt hole in the block. Then, by hand, thread in the mounting bolt by turning it clockwise to avoid cross-threading. To avoid damaging the O ring seal and causing an oil leak, lube it with a tiny amount of clean engine oil or WD40. Thread the mounting bolt into place once the sensor has been placed and tighten to around 2-3 foot-pounds. Figure19. Install New Cranks Angle Sensor Push the electrical connector into position while listening for a click to indicate that it has been properly placed and is ready to use.Figure .Install Crankshaft Angle Sensor Connector Step9 Reconnect the BatteryWhen you're done, take the car off the jack stands and rejoin the negative battery cable, and you're ready to go. Figure20. Reconnect the Battery Ⅵ Frequently Asked Questions about Crankshaft Position SensorHow much does it cost to replace a crankshaft position sensor?The average cost for crankshaft position sensor replacement is between $178 and $226. Labor costs are estimated between $98 and $123 while parts are priced between $81 and $103. How long does it take to replace crankshaft sensor?The engine still may run poorly, either way find a good mechanic, one who specializes in engine performance, and set an appointment – the sooner the better. In most instances, this repair should take no longer than one day. Does a crankshaft sensor have to be programmed?No, they do not have to be programmed. After the replacement you should cancel the code and see if it comes back. What happens if you don't relearn crankshaft position sensor?Failure to do such will result in over revving of the engine, causing possible engine damage. 8. Once the engine has returned to idle, check the status of Diagnostic trouble code P1336. If the scanner indicates that the CASE has been learned, the relearn procedure is now complete. 

IntroductionWith the advancement of automobile technology, an increasing number of cars are equipped with car tire pressure monitoring systems, which provide us with a quick and real-time understanding of the car tire pressure, and we no longer have to worry about insufficient and excessive tire pressure before driving, and the car tire pressure monitoring system has brought great convenience to our car. Currently, most car tires are equipped with pressure sensors to detect pressure changes in order to ensure the safety of car driving. According to relevant statistics, tire pressure reaches a reasonable value, which can not only improve driving safety but also reduce fuel consumption. So, how does a car tire pressure sensor work? This article will introduce in detail.Video: Tire Pressure Sensors CatalogIntroductionⅠ Principles of Tire Pressure Sensors in AutomobilesⅡ Design Background of TPMSⅢ Tire Pressure Sensors in a Tire Pressure Monitoring SystemⅣ Details of Tire Pressure Sensors in Direct Tire Pressure Monitoring SystemⅤ SummaryⅥ Frequently Asked Questions about Tire Pressure Sensors Ⅰ Principles of Tire Pressure Sensors in Automobiles1.Strain Sensors in AutomobilesThe principle of a strain sensor is primarily based on the resistive strain effect,when the conductor undergoes mechanical deformation due to external action, a corresponding change in resistance value occurs. Calculate the required pressure by first calculating the magnitude of strain using the relationship between the change in resistance value and the change in output electrical signal. The strain gauge pressure sensor is primarily used to measure the dynamic or static pressure of a flowing medium, such as the inlet and outlet gas or liquid pressure of power pipeline equipment, engine pressure, internal combustion engine pipeline pressure, and so on.The most widely used strain gauge is the paste strain gauge (strain gauge). Its main disadvantages are small output signal, narrow linear range, and poor dynamic response (see resistance strain gauge, semiconductor strain gauge). However, due to the small size of strain gauge, many specifications of commercial strain gauge can be selected, and the form of elastic sensor can be flexibly designed to adapt to various applications, strain type pressure sensor made by strain gauge is still widely used. According to the different structure of elastic sensor, strain type pressure sensor can be roughly divided into strain tube type, diaphragm type, strain beam type and combined type.Figure:Strain Sensors in Automobiles 2.Piezoresistive Pressure Sensors in AutomobilesThe piezoresistive pressure sensor's pressure sensitive element is a piezoresistive element that operates on the piezoresistive effect. The term "piezoresistive element" actually refers to the diffusion resistance created by integrated circuit technology on a semiconductor substrate. When subjected to external force, its resistance changes due to resistivity change. During normal operation, diffusion resistors must be attached to elastic elements, and monocrystalline silicon diaphragms are commonly used.The piezoresistive pressure sensor's main advantages are its small size, relatively simple structure, good dynamic response, high sensitivity, and ability to measure micro pressures of more than ten Pascals. It is a relatively ideal one, and it is currently being developed and applied at a rapid pace. Sensor of pressure. Non-linearity and temperature affect the measurement accuracy of this sensor, affecting the size of the piezoresistive coefficient. Microprocessors are used in today's intelligent piezoresistive pressure sensor to compensate for nonlinearity and temperature. It integrates the sensor and computer on the same silicon chip using large-scale integrated circuit technology, and it has functions such as signal detection, processing, and memory. As a result, the sensor's stability and measurement accuracy are greatly improved.Figure:Piezoresistive Pressure Sensor 3.Other Automotive Pressure SensorsFurthermore, differential transformer type pressure sensors (LVDT) and surface elastic wave pressure sensors are available (SAW). SAW type pressure sensors have small size, light weight, low power consumption, high reliability, high sensitivity, high resolution, digital output, and so on. LVDT type pressure sensors have larger output, easy to digital output, but poor anti-interference. It is used to detect the pressure of an automobile suction valve and can operate reliably in high temperatures. Ⅱ Design Background of TPMSThe tire pressure influences both the car's excellent performance and the length of the tire's service life. According to SAE (Society of Automotive Engineers) data, there are more than 260,000 traffic accidents caused by tire failure in the United States each year, with flat tires accounting for 70% of highway accidents. Furthermore, natural tire leakage or under-inflation is the leading cause of tire failure. Every year, approximately 75% of tire failures occur. The data also shows that in high-speed driving, punctures caused by tire failure are a major cause of traffic accidents.Flat tires, the unseen killer, have caused numerous human tragedies and incalculable economic losses to the country and businesses. As a result, in order to reduce the number of traffic accidents caused by flat tires, the US federal government has mandated that automakers accelerate the development of TPMS ( Tire Pressure Monitoring System).Figure:Tire Pressure Monitoring System Ⅲ Tire Pressure Sensors in a Tire Pressure Monitoring SystemThere are two main tire pressure monitoring system solutions: direct system and indirect system.The direct tire pressure monitoring system measures tire pressure directly using the pressure sensor installed in each tire and displays and monitors the tire pressure. The system will automatically alert if the tire pressure is too low or if there is a leak.To monitor tire pressure, the indirect tire pressure monitoring system compares the speed difference between tires using the wheel speed sensor of the automobile abs system.The main disadvantages of this type of system are as follows: 1. The accurate instantaneous air pressure value of each tire cannot be displayed; 2. It is not possible to alarm when the pressure of the same axle, same side wheel, or all tires drops at the same time; and 3. Factors such as vehicle speed and detection accuracy cannot be taken into account simultaneously.Figure:Tire Pressure Sensors in a TPMS Ⅳ Details of Tire Pressure Sensors in Direct Tire Pressure Monitoring SystemThere are two types of direct tire pressure monitoring systems: active and passive.The active system makes capacitive or piezoresistive pressure sensors on silicon using mems technology. Each rim has a pressure sensor, and the signal is transmitted via radio frequency. It is set up in the wireless cab. The pressure sensitive signal is received by the receiving device, which then displays the current tire pressure after some signal processing.The advantage of active technology is that it is relatively mature, and the modules developed can be applied to tires of various brands, but the disadvantages are also more noticeable. Its induction module requires battery power, posing a problem with system service life.The passive tire pressure monitoring system's sensor is based on surface acoustic waves. A radio frequency electric field is used to generate a surface acoustic wave in this sensor. The surface acoustic wave changes as it passes through the surface of the piezoelectric substrate material. The change in the surface acoustic wave can indicate tire pressure. Although this technology does not require battery power, it does necessitate the integration of the transponder into the tire, and it can only be implemented if tire manufacturers agree on a common standard. The tire pressure monitoring system must detect abnormal tire pressure conditions, and it can only do so with high resolution and accuracy. Battery life is limited, and capacity is affected by temperature as well. It is best for the sensor to perform passive detection in order to improve system reliability. According to studies, the information collected by tire pressure sensors can be used to monitor vehicle suspension failures and correct navigation systems. As a result, the future automotive pressure sensor should be a passive intelligent sensor with multiple functions. Ⅴ SummaryIn recent years, automotive sensors have been the fastest growing and most widely used sensor category. The growth of the automotive industry encourages the rapid development of automotive pressure sensors. Sensor performance is improving as a result of advances in manufacturing and process technology, and tire pressure monitoring is becoming increasingly important. Ⅵ Frequently Asked Questions about Tire Pressure Sensors1.When should a tire pressure sensor be replaced?TPMS sensors are designed to last for many years.5-10 years is a likely lifespan. Given their cost, most drivers will be inclined to replace TPMS sensors on an “as needed” basis.In other words, only once their batteries have expired, or other TPMS components have failed. 2.Is it safe to drive with tire pressure sensor fault?No, driving with the TPMS Light on is not safe. It means one of your tires is underinflated or overinflated. This can cause undue wear on the tire, potentially lead to a tire failure, and cause a blowout dangerous to you and other drivers on the road. 3.How much does it cost to replace a tire pressure sensor?The average cost for TPMS sensor replacement is between $207 and $257. Labor costs are estimated between $53 and $67 while parts are priced between $154 and $190. This range does not include taxes and fees, and does not factor in your specific vehicle or unique location. Related repairs may also be needed. 4.How do you fix a tire pressure sensor?Without starting the car, turn the key to the “On” position. Press the TPMS reset button and hold it until the light blinks three times, then release it. Start the car and let it run for 20 minutes to reset the sensor. You'll usually find the tire pressure monitor reset button beneath the steering wheel. 5.How do I know if my tire pressure sensor is bad?A small light illuminates at the dashboard's display panel whenever there is a problem with the tire pressure sensors. It appears as a vivid yellow exclamation point inside of a U symbol; you'd be easily able to spot it. As soon as it turns on, the driver must check the tire for less or no air.