How to check the condition of a DC voltmeter
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I have a question: can the quality of a DC voltmeter be checked using a multimeter? If so, how can I check it? If it’s not possible, what instruments should be used for the inspection, and how should it be done?
Based on the range of the DC voltmeter, an AC power supply with a corresponding voltage level can be selected (a voltage regulator can be used); then a rectifier diode should be connected in series with the voltmeter, and a multimeter set to the DC voltage setting should be connected in parallel with it. After power is supplied, the condition of the voltmeter can be determined by comparing its readings with those taken by a multimeter and a DC voltmeter.
Use the highest resistance setting on a multimeter to check for an open circuit, and apply voltage using a test bench to see if the readings are correct