A clamp meter is an instrument used to measure the magnitude of the current of a running electrical circuit, and it can measure the current in an environment without power outages.
1. Layout and Principle
In essence, it consists of a current transformer, a pliers wrench and a rectifying magnetoelectric system with a reaction force meter.
2. Use the essentials
(1) The machine should be zeroed before measurement
(2) Select the suitable range, first select the large range, then select the small range or look at the nameplate value for estimation.
(3) When the minimum range measurement is used, and the reading is not significant, the wire under test can be wound a few turns, and the number of turns should be based on the number of turns in the middle of the closed mouth, then the reading = the indicated value range / the number of full deflection turns
(4) When measuring, the wire under test should be in the middle of the closed mouth, and the closed mouth should be closed precisely to eliminate the deviation.
(5) After the measurement is completed, the transfer switch should be placed at the most in the range.
3. meticulous events
(1) The voltage of the circuit under test should be lower than the rated voltage.
(2) When measuring the current of the high-voltage line, wear insulating gloves, wear insulating shoes, and stand on the insulating pad.
(3) It is not possible to change the range with power on if the mouth should be closed precisely.
