A clamp type ammeter is a type of ammeter used to measure the current value in a circuit, abbreviated as a current clamp. In electrical and electronic engineering, current clamps (also known as current probes) are two open-ended clamp type probes used to clamp electrical conductors around electrical equipment, and the probes do not need to come into contact with the conductive parts of the equipment, that is, they do not need to disconnect the equipment wires for probe insertion to measure the properties of current in the conductor. Current clamp is usually used to measure sine wave current (alternating current (AC)). Combined with more advanced detection instruments, it can also test phase and waveform. Generally speaking, very high AC current (above 1000A) is easy to measure, while DC current and very low AC current (milliampere level) are difficult to measure accurately
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