Digital Clamp Meter Notes How does a Digital Clamp Meter work?
Attention to digital clamp ammeter: Clamp ammeter is divided into high and low voltage, and is used to directly measure the current in the circuit without disconnecting the circuit. The usage method is as follows: When measuring on a high-voltage circuit, it is forbidden to connect a wire from the clamp ammeter to another meter for measurement. When measuring the current of each phase of high-voltage cables, the distance between cable heads should be at least 300mm, and the insulation should be good. The measurement can only be carried out when it is deemed convenient. When measuring the current of low-voltage fuses or horizontally arranged low-voltage busbars, the fuses or busbars of each phase should be protected and isolated with insulating materials before measurement to prevent phase to phase short circuits. When a cable is grounded, measurement is strictly prohibited. Prevent the occurrence of ground breakdown and explosion due to low insulation level of cable heads, which may endanger personal safety. When using a high-voltage clamp meter, attention should be paid to the voltage level of the clamp ammeter, and it is strictly prohibited to use a low-voltage clamp meter to measure the current of the high-voltage circuit. When measuring with a high-voltage clamp meter, it should be operated by two people. Non duty personnel should also fill out a second type of work order for measurement. When measuring, they should wear insulated gloves, stand on an insulated pad, and not touch other equipment to prevent short circuits or grounding. 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 body should not be less than the entire length of the clamp shaped watch. After the clamp ammeter measurement is completed, pull the switch to the maximum range to avoid accidental overcurrent during the next use; And it should be stored in a dry indoor environment. The working principle of a clamp ammeter is that it is composed of a current transformer and an ammeter. The iron core of the current transformer can be opened when the wrench is tightened; The wire through which the measured current passes can pass through the open gap of the iron core without cutting, and the iron core will close when the wrench is released. The tested circuit wire passing through the iron core becomes the primary coil of the current transformer, and current is induced in the secondary coil through the current. So that the ammeter connected to the secondary coil can indicate the current of the tested circuit. The clamp gauge can be changed to different ranges by shifting the switch. But it is not allowed to operate with electricity when shifting gears. Clamp gauges generally have low accuracy, typically ranging from 2.5 to 5 levels. For ease of use, there are also conversion switches with different ranges inside the meter for measuring different levels of current and voltage.
