How to insert the multimeter to measure the AC voltmeter
In general, for the convenience of use of multimeters, there is an unwritten rule to distinguish the positive and negative poles and the insertion of test pens, that is, the red test pen is inserted into the positive pole of the multimeter, and the black test pen is inserted into the negative pole of the multimeter. When measuring alternating current, the two test pens are not divided into positive and negative poles, as long as the correct measurement gear is selected, the measurement can be performed. When selecting the measurement range, it must be greater than the measured voltage value. For example, when measuring 220V AC voltage, you should choose to measure AC 250V gear.
