a. Adjust the DC power supply to the rated voltage, R is 1KΩ, and check whether the test circuit is connected well. <br>b. Switch the switch to C (Charge), adjust the R value so that the voltmeter rises to the rated voltage within 5 minutes, and keep charging for 5 minutes. <br>c. Turn the switch to T (Test) position to test, the indicated value of the ammeter is the leakage current (LC). <br>d. For the LC METER, the LC value after charging for one minute can be directly measured.
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