Summary of key points for using clamp ammeters
Clamp meter (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 current transformers. 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. When the wrench is released, the iron core closes. The tested circuit wire passing through the iron core becomes the primary coil of the current transformer, where the current is induced in the secondary coil through the current. Thus, 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 gears of the switch. However, it is not allowed to operate with power when shifting gears. The accuracy of clamp shaped 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 functions such as 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 level of an operating electrical circuit, which can measure the current without interruption. It is an electrical instrument specifically designed to measure high AC currents.
Clamp ammeters are also known as clamp meters, and in Taiwan, they are more commonly referred to as hook meters.
A clamp type 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 cut off the circuit to detect current, while clamp type ammeters are simply clamped on the outer skin of the energized wire to detect current. The operation is simple and can safely detect large currents without directly connecting the circuit
Clamp type meters, multimeters, and insulation resistance meters all come in two types: analog pointer type and digital type
Standard type detection range: AC and DC are both around 2A to 200A or 400A, 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 RMS of non sinusoidal waves other than sinusoidal waves such as transformer power supplies and switching power supplies
