Summary of key points for use of clamp-on ammeters
Clamp meter is an instrument that combines current transformers and ammeters, and is an important branch of digital multimeter. Its working principle is the same as measuring current with a current transformer. 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 it off, and the iron core closes when the wrench is released. The tested circuit wire passing through the iron core becomes the primary coil of the current transformer, and the current is induced in the secondary coil through the current. So that the ammeter connected to the secondary coil has an indication - to measure the current of the tested circuit.
The clamp meter can be changed to different ranges by shifting the gear of the switch. But it is not allowed to operate with electricity when shifting gears. The accuracy of clamp watches is generally not high, usually ranging from 2.5 to 5 levels. For ease of use, there are also conversion switches with different ranges in 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 measuring AC and 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 AC high currents.
Clamp ammeter, also known as clamp meter, is more commonly referred to as hook meter in Taiwan.
A clamp ammeter is a convenient testing instrument (also known as non-destructive measurement) that clamps wires and detects current without cutting off the circuit
Analog pointer multimeters and digital multimeters are used to cut off the circuit and detect current, while clamp type ammeters are only clamped on the outer skin of the live wire to detect current. The operation is simple and can safely detect large currents without directly connecting the circuit
Clamp gauges, multimeters, and insulation resistance meters all come in two types: analog pointer and digital
The detection range of the standard type is around 2A to 200A or 400A for both AC and DC, and there are also products that can detect high currents of 2000A;
There are also leakage detection products that can detect small currents of several mA, as well as products that can detect the true effective value (RMS) of non sinusoidal waves outside of sine waves such as transformer power supplies and switching power supplies
Key points of clamp table
1: Detection object
Choose the model based on different detection objects, such as AC current, DC current, or leakage current;
2: Detectable z-conductor specifications
There are different specifications ranging from 21mm diameter to 53mm diameter for testing purposes
3: Is it necessary to check the true efficacy value
The clamp ammeter using the average method cannot accurately detect non sinusoidal circuits such as motors and transformer circuits. To detect such circuits, a clamp ammeter using the true RMS method should be used
4: Other functions
A model that not only detects current, but also integrates detection function and recording output
