Precautions for the use of digital clamp meters
Clamp-on ammeters are divided into two types: high and low voltage, which are used to directly measure the current in the line without disconnecting the line. It is used as follows:
(1) When using a high-voltage clamp meter, you should pay attention to the voltage level of the clamp-type ammeter, and it is strictly forbidden to use a low-voltage clamp-type meter to measure the current of the high-voltage loop. When measuring with a high-voltage clamp meter, it should be operated by two people. The non-duty personnel should also fill in the second work sheet. When measuring, they should wear insulating gloves, stand on the insulating pad, and should not touch other equipment to prevent short circuit or grounding.
(2) When observing the time of the watch, special attention should be paid to maintaining a safe distance between the head and the live part. The distance between any part of the human body and the live body should not be less than the entire length of the clamp meter.
(3) When measuring on a high-voltage circuit, it is forbidden to use a wire to connect another meter from the clamp-type ammeter to measure. When measuring the current of each phase of the high-voltage cable, the distance between the cable heads should be more than 300mm, and the insulation should be good.
(4) When measuring the current of low-voltage fusible fuses or horizontally arranged low-voltage busbars, the fusible fuses or busbars of each phase should be protected and isolated with insulating materials before measurement to avoid short-circuit between phases.
(5) Measurement is strictly prohibited when one phase of the cable is grounded. Prevent personal safety from jeopardizing personal safety due to the low insulation level of the cable head and the occurrence of ground breakdown explosion.
(6) Pull the switch to the maximum range after the clamp-type ammeter measurement is completed, so as to avoid accidental overcurrent in the next use; and it should be stored in a dry room.
