Use of clamp meter:
A clamp meter is an instrument used to measure the magnitude of the current in a running electrical line, and it can measure the current without interruption.
1. Structure and principle of clamp meter
The clamp meter is essentially composed of a current transformer, a clamp wrench and a rectifying magnetoelectric system with reaction force meter.
2. How to use the clamp meter
(1) Mechanical zero adjustment is required before measurement
(2) Select the appropriate range, first select the large range, then select the small range or look at the nameplate value for estimation.
(3) When using the smallest measurement range and the reading is not obvious, you can wind the tested wire a few turns, the number of turns should be based on the number of turns in the center of the jaw, then the reading = indicated value × range / full deviation × number of turns
(4) When measuring, the conductor under test should be in the center of the jaws, and the jaws should be closed tightly to reduce errors.
(5) After the measurement is completed, the switch should be placed at the maximum range.
3. Precautions when using the clamp meter
(1) The voltage of the circuit under test should be lower than the rated voltage of the clamp meter.
(2) When measuring the current of the high-voltage line, wear insulating gloves, wear insulating shoes, and stand on the insulating pad.
(3) The jaws must be closed tightly and the range cannot be changed with electricity
