The method of using and maintaining the voltmeter is similar to the method of using and maintaining the ammeter. The following points should also be noted:
(1) When measuring, the voltmeter should be connected in parallel to the circuit under test.
(2) Since the voltmeter and the load are connected in parallel, the internal resistance Rv is required to be much larger than the load resistance RL.
(3) When measuring DC, first put the “—†button of the voltmeter into the low potential end of the circuit under test, and then connect the “+†terminal to the high potential end of the circuit under test.
(4) For multi-quantity voltmeters, when the limit is required, the voltmeter should be disconnected from the circuit under test, and then the limit should be changed.
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