Principle of clamp current meter
The clamp ammeter is mainly composed of a current transformer and an ammeter, used to detect the circuit current when the circuit is closed. It has multiple functions such as automatic shutdown, data retention, resistance/buzzing, and automatic zeroing;
And its simple operation and easy portability, especially its feature of not requiring circuit disconnection, make it an essential detection instrument in certain situations.
Precautions for operating clamp ammeter:
1. When measuring currents below 5A, it is recommended to use a loop measurement to improve the measurement results;
2. Ensure that the jaws are clean and undamaged to prevent dirt and other contaminants from affecting the measurement results;
3. Try to place the measuring fluid at the center of the clamp as much as possible;
4. It is not allowed to use a clamp ammeter to measure the current of exposed wires, in order to avoid electric shock, short circuit and other phenomena.
5. If electromagnetic noise is heard from the jaws during measurement, or there is a slight vibration sensation in the hand holding the clamp shaped ammeter, it indicates that the end face of the jaws is not tightly connected, and there may be rust spots or dirt. It should be cleaned immediately, otherwise it will cause inaccurate measurement.
6. When measuring with current, the range cannot be changed. The current should be disconnected before changing the range, otherwise the clamp ammeter is prone to damage and the measuring personnel are not safe.
Principle of clamp ammeter:
The clamp ammeter utilizes the working principle of mutual inductance. When the wrench is tightened, the iron core of the current transformer opens, and the measured current flows through the gap of the iron core. After releasing the wrench, the iron core closes, thus completing the fixation of the measured wire.
During the detection process, the wire passing through the iron core is regarded as the primary coil of the current transformer, and current flows through the primary coil, causing current to be induced in the secondary coil as well;
And connected to its secondary side is an ammeter, so the magnitude of the measured current in the primary side wire can be obtained by displaying the reading on the ammeter.
