Principle guide of digital clamp meter
Clamp meter (clamp meter), it has many names, it can be called clamp meter multimeter, AC and DC clamp meter and so on. It is an instrument that integrates a current transformer and an ammeter, and is an important branch of a digital multimeter. Its working principle is the same as that of a 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 gap opened by the iron core without being cut off, and the iron core is closed when the wrench is released. The measured circuit wire passing through the iron core becomes the primary coil of the current transformer, and the current is induced in the secondary coil by passing the current. So that the ammeter connected to the secondary coil has an indication ----- measure the current of the line under test.
The clamp meter can be changed to different ranges by changing the gear of the switch. But it is not allowed to operate with electricity when shifting gears. The clamp meter is generally not high in accuracy, usually in the range of 2.5 to 5. For the convenience of use, there are switches of different ranges in the meter for the function of measuring different levels of current and measuring voltage.
The clamp ammeter is called clamp meter for short. Its working part is mainly composed of an electromagnetic ammeter and a feed-through current transformer. The core of the core-through current transformer is made into a movable opening and is shaped like a clamp, so it is called a clamp ammeter. It is a portable instrument that can directly measure the AC current of the circuit without disconnecting the circuit. It is very convenient to use in electrical maintenance and widely used.
The clamp meter was originally used to measure AC current, but now it also has the functions of a multimeter, which can measure AC and DC voltage, current, capacitance, diode, transistor, resistance, temperature, frequency and so on.
A clamp meter is a meter used to measure the magnitude of the current in a running electrical circuit, and it can measure the current without interruption of power supply. It is an electrical instrument specially designed for measuring AC large current.
