The clamp-type ammeter, also known as a current clamp, is a device used to measure electrical current without the need to break the circuit. It consists of a current transformer and a power meter equipped with a rectification system. Figure 5-2(a) shows the overall structure of the clamp meter, while Figure 5-2(b) illustrates its internal circuitry. The core of the current sensor is shaped like a jaw. When the handle is pressed, the core opens, allowing the current-carrying wire to pass through the gap. Once the handle is released, the core closes around the wire, which then acts as the primary winding of the current transformer.
As the current flows through the wire, it creates a magnetic flux in the iron core. This magnetic flux induces an electromotive force (EMF) in the secondary winding wrapped around the core. The resulting current passes through the measuring circuit, where it is rectified and adjusted based on the selected range. The meter head displays the measured current, which corresponds to the actual current in the wire being tested. The range can be changed by switching between different shunt resistors using a transfer switch. This design allows for safe and convenient current measurement in various applications.
ac dc adapter,dc adapter,ac adapter 12v,dc power adapter,ac dc adapter 24v
FOSHAN SHUNDE KELICHENG POWER SUPPLY TECHNOLOGY CO., LTD , https://www.kelicpower.com