BM822A type digital clamp meter is how to measure current?
Clamp meter working principle: clamp meter is composed of a current transformer and current meter assembly. The iron core of the current transformer can be opened when the wrench is tightened; the wire through which the current is measured can be cut through the opening of the iron core without cutting off, and when the wrench is released, the iron core is closed. Through the test circuit of the core, the wire becomes the primary coil of the current transformer, in which the current is induced in the two coil through the current. Thus, the current meter connected with the two coil is instructed to measure the current of the line to be measured. A table can shift through the switch, the scale change. But the switch is not allowed to operate when charged. Clamp meter general accuracy is not high, usually 2.5 ~ 5. In order to facilitate the use of the table there are different ranges of switching switches for measuring different levels of current and voltage measurement function.
Each phase current is measured separately, and the current in the rated range is its load current, exceeding the rated value, and the current is its overload current. A table definition: clamp type table (sometimes called table clamp, clamp meter) AC / DC clamp meter as the daily maintenance work is one of the essential test tool, mainly used to test the voltage, current, frequency and other related parameters, it has high test precision, resolution and more test function.
The top position to clamp meter alternating current file (maximum current clamp meter must be 1.25 times higher than the load current)
