Capacitor inspecting method

Abstract

The invention discloses a capacitor inspecting method. The method includes: applying sine alternating currents with the frequency of 50Hz and voltage effective value of U to two ends of a loop formed by a to-be-inspected capacitor and a resistor R with known resistance; detecting the voltage UR at two ends of the resistor R; calculating the voltage UC at two ends of the to-be-inspected capacitor according to UC=U-UR; calculating the current I of a serial loop formed by the to-be-inspected capacitor and the resistor R according to I=UR/R; using the formula C=I/(UC*2 pi f) to obtain the capacitance C of the to-be-inspected capacitor according to the calculated UC and I; performing difference value verification on the capacitance C according the capacitance of a reference capacitor under the sine alternating currents with the frequency of 50Hz. By the method, verification errors can be reduced effectively, accuracy and practicality are achieved, actual application requirements can be satisfied conveniently, capacitor screening can be performed, and the application effect of the to-be-inspected capacitor is guaranteed favorably.

Description

technical field [0001] The invention relates to a capacitance testing method. Background technique [0002] Capacitors are essential electronic components in electronic circuits, and are widely used in DC blocking, coupling, bypass, filtering, tuning loops, energy conversion and control circuits, etc., and their accuracy directly affects the reliability and reliability of electronic circuits. Circuit performance, capacitance can be divided into ordinary capacitance and precision capacitance due to the difference in nominal accuracy, the accuracy ranges from ±20% to ±0.5%, the size of capacitance C is affected by capacitance material, shape, distance between plates, temperature , humidity and other factors, so the actual capacitance value of the capacitor with the same nominal value often has a certain difference, so it is very necessary to check the capacitance value of the capacitor in actual use, especially for decoupling circuits Insufficient capacitance accuracy of the ...

AI Technical Summary

Problems solved by technology

[0002] Capacitors are essential electronic components in electronic circuits, and are widely used in DC blocking, coupling, bypass, filtering, tuning loops, energy conversion and control circuits, etc., and their accuracy directly affects the reliability and reliability of electronic circuits. Circuit performance, capacitance can be divided into ordinary capacitance and precision capacitance due to the difference in nominal accuracy, the accuracy ranges from ±20% to ±0.5%, the size of capacitance C is affected by capacitance material, shape, distance between plates, temperature , humidity and other factors, so the actual capacitance value of the capacitor with the same nominal value often has a certain difference, so it is very necessary to check the capacitance value of the capacitor in actual use, especially for decoupling circuits The capacitance of the decoupling capacitor, the capacitance accuracy of the decoupling capacitor is not enough will directly lead to poor decoupling effect, and then affect the overall performance of the circuit

Images