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Here 4 is first digit, 7 is second digit and 3 is the number of zeros i. Now we will see one example to understand this concept below. Letters for the specific tolerance value representation is shown in the below table. In the above figure we observed the capacitance values and tolerance for small disc or large disc capacitors can be calculated by using color code which is shown at the side of capacitors. In the case of two digit number representation tolerance is also identified. So these old capacitors are now replaced with new numbers. But it is difficult to identify the values in the case of old capacitors.
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These colour codes are used from many years for non-polarized capacitors like disc and ceramic capacitors. The above figure shows the Disc and Ceramic capacitors with color codes.
Capacitor code chart pdf how to#
How to Test Capacitors with and without using Multimeter These values can be understood by the color code table which is given at the side of capacitors in the above figure. All the above capacitors have different capacitance and tolerance values. In this each color represents a specific parameter for capacitance values, tolerance and working voltages. The capacitors which are shown in the above figure are metalized polyester capacitors with color codes. Now let us the meaning of those letters which are used on the body of a capacitor. In this representation we see some letters or characters like J, K, N, M etc. Some voltage values are used as references for working voltages of a capacitor. The capacitor has the capacitance value, voltagetolerance and manufacturer numbers on the body of a capacitor. These color schemes color coding and colors assigned for values are explained in below. Using this color scheme we can easily identify the capacitance values, voltages and tolerance values of any capacitor. In this scheme each color of a capacitor indicates a specific capacitance value. This colour scheme for capacitors is usually called as capacitor color coding. So to avoid these problems a color scheme was introduced for capacitors like resistors. It also causes misreading of the actual capacitance and voltage values. But sometimes it is difficult to identify these capacitance and voltage values on the capacitor body in the case of decimal values. Generally the capacitance values, working voltage and tolerance values are indicated on the body of a capacitor. The capacitance of a capacitor is measured in the units of Farads. Author: Peter J.Capacitance of a capacitor is the ability of a capacitor to store maximum charge on its plates. They were originally utilised in the line-output stages of conventional CRT based television sets. For switched-mode power supply applications, epoxy coated flame retardant capacitors are usually used. Ceramic disc capacitors come in many versions.įor basic general applications, the brown ones are usually utilised for decoupling in low voltage circuits. However, manufacturers often use a combination of the above marking scheme. Sometimes capacitors do not have any markings regarding voltage rating and you have to look up the documentation of that component. If there is no underline, then the rating is V, assuming the manufacturer follows the marking scheme. Large electronics suppliers will tend to stock all of these. Here is a list of the currently available ceramic disc capacitors consisting of standard values. As you can see, it is so easy that you can do this in your head. Here is another example, code is 10 followed by four zeros, hence 10 pF. Grade 7 module 1 unit 1 lesson 12 answer keyĮngineers usually do not require calculators because the code is so simple. If you are new to capacitor codes, then the best way to start is with a chart, because that way, you can see the arrangement of the code. A ceramic disc capacitor does not have a polarity and connects in any direction on the printed circuit board. The first two significant digits represent the first two digits of the actual value, which is Since this is the EIA coding system, the value will be in pico farads. They are very easy to decode to find the value.