How a clamp meter works:
The working principle of the clamp ammeter is based on the working principle of the current transformer. When the clamp ammeter wrench is tightened, the iron core of the current transformer can be opened, and the wire of the measured current enters the jaw as a current mutual inductance. primary winding of the device. When the iron core of the loosening wrench is closed, an induced current is generated on its secondary winding according to the principle of the transformer, and the pointer of the ammeter deflects, thereby indicating the value of the measured current.
Note: Since the principle is based on the principle of the transformer, whether the iron core is closed tightly and whether there is a large amount of residual magnetism has a great influence on the measurement result. When measuring a small current, the measurement error will increase. At this time, the wire under test can be wound several times on the iron core to change the current ratio of the transformer to increase the current range.
