How To Test A Capacitor In Circuit

September 17, 2019

Check the capacitors voltage rating. By taking the capacitors resistance we can determine whether the capacitor is good or bad.

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How To Test A Capacitor

A very good test you can do is to check a capacitor with your multimeter set on the ohmmeter setting.

How to test a capacitor in circuit. Set your voltmeter to read dc voltage if its capable of reading. How to test a capacitor testing a capacitor with a voltmeter disconnect the capacitor from its circuit. Connect a known resistor typically a 10 kw resistor in series with the capacitor.

Test a capacitor with an ohmmeter of a multimeter. Charge the capacitor with a known voltage less than but close to its rated voltage. Discharging of a capacitor can be done by shorting its legs by any available means.

This removes the residual capacitance value of the test leads. Complete the circuit by connecting a power supply of known. To place a multimeter in relative mode for capacitance leave the test leads open and press the rel button.

Connect the test leads to the capacitor terminals. Turn on the esr meter and short its leads until you get 0 reading on its screen. To do this test we take the ohmmeter and place the probes across the leads of the capacitor.

Following are the quick steps to test any in circuit capacitor with esr meter. Method 3 testing a capacitor by measuring the time constant first make sure that the capacitor is disconnected from the board and is properly discharged. Keep test leads connected for a few seconds to allow the multimeter to automatically select the proper range.

Discharge the under test capacitor first.