Read Z as plus 80 percent to minus 20 percent.Īn electrolytic capacitor is a polarized capacitor which uses an electrolyte to achieve a larger capacitance than other capacitor types. Read P as plus 100 percent to minus 0 percent. This letter represents the tolerance of the capacitor, meaning how close the actual value of the capacitor can be expected to be to the indicated value of the capacitor. Some capacitors are defined by a three number code followed by a letter. The digits are the values before and after the decimal point and the the character tells you the dimension so the example given is 1.0 nF (nano-Farad). Some small capacitors are marked with codes like 1n0. For example, 472 would indicate a 4700 pF capacitor and 479 would indicate a 4.7 pF capacitor. A third digit of 9 means to multiply the base value by 0.1. A third digit of 8 means multiply the base value by. Use a third digit of 0 through 5 to place the corresponding number of 0s behind the base value. The third digit will indicate a multiplier to be used on the base number to find the actual value of the capacitor. The first two digits will indicate the base capacitor value in picoFarads. Read three digit numbers as a base capacitance value in picoFarads and a multiplier. Read two digit numbers as being in picoFarads (pF). Read the capacitance of smaller bodied capacitors as two or three numbers.The designators uF or pF will not appear due to the small size of the capacitor body. For example, 47 uF indicates 47 microFarads. If the surface of the body is large enough, the value will be printed directly on the capacitor. Read the value directly on larger bodied capacitors. 
1 picoFarad is 1 times 10 to the -12 power Farad.
1 microFarad is 1 times 10 to the -6 power Farad. Smaller denominations of capacitance are used by electronic circuits. This value is too large to be of use in a circuit. The base unit of capacitance is the Farad (F). Understand the units of measurement used for capacitors. Use these tips to learn how to read capacitor designations and determine the value of the capacitor. Different capacitor values are needed to trap different types of noise. The most common usage of capacitors is to absorb noise, which is by definition a rapidly changing signal, and divert it away from the signal of interest.
Capacitors can store the energy from strong rapidly changing signals and return that energy to the circuit as desired. Download: Electronics Manual(that we give to our customers)Ĭapacitors are elements of a circuit that react to rapidly changing signals, rather than slowly changing or static signals.
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