Electrical instruments commonly used by maintenance electricians include: ammeter, voltmeter, multimeter, power meter, electric energy meter, frequency meter, phase meter, power factor meter, grounding resistance measuring instrument, bridge, insulation resistance meter (also known as megohmmeter, shaker meter), clamp ammeter and electronic oscilloscope, etc.
If these instruments do not pay attention to the correct use method or are slightly negligent during measurement, they will either burn the instrument or damage the components under test, and even endanger personal safety.
Therefore, it is very important to master the correct use of common electrical measuring instruments.
