Measurement Method and Precautions for Use of Clamp Ammeter
Firstly, when using, the wrench should be tightened to open the jaws. Place the measured wire in the center of the jaws, then loosen the wrench and close the jaws tightly. If there is any noise on the joint surface of the pliers, it should be reopened and closed again. If there is still noise, the joint surface should be treated to ensure accurate readings. Additionally, it is not allowed to clamp two wires simultaneously. After reading, open the jaws, exit the measured wire, and set the gear to the highest current or OFF gear.
Secondly, the appropriate range of the clamp type ammeter should be selected based on the magnitude of the measured current. The selected range should be slightly larger than the measured current value. If it cannot be estimated, to prevent damage to the clamp ammeter, the measurement should start from the maximum range and gradually shift gears until the range is suitable. It is strictly prohibited to switch the gear of the clamp ammeter during the measurement process. When shifting gears, the measured wire should be removed from the clamp before changing the gear.
When measuring the current of low-voltage fusible fuses or horizontally arranged low-voltage busbars, each phase of fusible fuses or busbars should be protected and isolated with insulation materials before measurement to avoid causing phase to phase short circuits. When one phase of the cable is grounded, it is strictly prohibited to measure to prevent ground breakdown and explosion caused by low insulation level of the cable head, which may endanger personal safety.
Clamp type ammeters are divided into two types: high and low voltage, used to directly measure the current in the circuit without disconnecting the circuit. The precautions are as follows:
(1) When using a high-voltage clamp meter, attention should be paid to the voltage level of the clamp ammeter. It is strictly prohibited to use a low-voltage clamp meter to measure the current of the high-voltage circuit. When using a high-voltage clamp meter for measurement, it should be operated by two people. Non duty personnel should also fill out the second type of work ticket for measurement. During measurement, insulation gloves should be worn, standing on insulation pads, and other equipment should not be touched to prevent short circuits or grounding.
(2) When observing the timing of the watch, special attention should be paid to maintaining a safe distance between the head and the charged part. The distance between any part of the human body and the charged part should not be less than the entire length of the clamp watch.
(3) When measuring on a high-voltage circuit, it is prohibited to connect wires separately from a clamp ammeter
Meter measurement. When measuring the current of each phase of high-voltage cables, the distance between the cable heads should be at least 300mm, and the insulation should be good. Only when the measurement is considered convenient can it be carried out.
(4) When measuring the current of low-voltage fusible fuses or horizontally arranged low-voltage busbars, each phase of fusible fuses or busbars should be protected and isolated with insulation materials before measurement to avoid causing phase to phase short circuits.
(5) When one phase of the cable is grounded, measurement is strictly prohibited. To prevent the occurrence of ground breakdown and explosion due to the low insulation level of the cable head, which may endanger personal safety.
(6) After the measurement of the clamp ammeter is completed, turn the switch to the maximum range position to avoid accidental overcurrent during the next use; And should be stored indoors in a dry place.
