Summary of key points for using clamp-on ammeters
Clamp meter (clamp meter) is an instrument that combines current transformer and ammeter, and is an important branch of digital multimeter. Its working principle is the same as that of current transformer for measuring current. A clamp meter is a combination 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.
The clamp meter was originally used to measure AC current, but now it also has the functions of a multimeter, which can measure AC/DC voltage, current, capacitance, diode, transistor, resistance, temperature, frequency, and so on.
A clamp meter is an instrument used to measure the current of a running electrical circuit, which can measure the current without interruption. It is an electrical instrument specialized in measuring high AC currents.
Key points of clamp table
1: Detection object
Choose the model based on different detection objects, AC current, DC current, or leakage current;
2: Detectable Z large conductor specifications
In conjunction with the testing site, there are different specifications ranging from 21mm diameter to 53mm diameter
3: Is it necessary to detect the true efficacy value
The clamp ammeter using the average method cannot correctly detect non sinusoidal circuits such as motors and transformer circuits The detection of this circuit should use a clamp ammeter with true RMS mode
4: Other functions
A model that not only detects current, but also integrates detection function and recording output
