Application and working principle of the clamp current meter
Usually when measuring current with an ordinary ammeter, the circuit needs to be cut off and the ammeter can be switched in to be measured. This is very troublesome, and sometimes the normal running motor is not allowed to do so. At this point, it is much more convenient to use an ammeter to measure current without disconnecting the circuit.
Its working principle is as follows: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. A current meter connected with the two coil is used to indicate 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.
