Chinese instrument through VC3266B forcipated portable digital multimeter manual
Clamp type ammeterPart of the work clamp meter is mainly composed of an electromagnetic current meter and straight through current transformer. The iron core through type current transformer made movable opening, and clamp, clamp ammeters. Named is not need to disconnect the circuit can be directly measured the alternating current circuit of the portable instrument, very easy to use in electrical maintenance, a wide range of applications.
(1) mechanical zeroing is necessary before measurement(2), read the instructions carefully before use in the clamp meter, it is AC or DC, AC and DC.(3) the measured voltage clamp meter shall not exceed the values marked on the ground, otherwise easy to cause the accident, or cause the risk of electric shock.(4), current clamp meter only measuring one conductor, the measured wire clamp should be placed in the center of the window, can not be multiphase wires into the measurement window.(5), clamp meter before measurement was estimated the size of the current, and then decide which one range. If unable to estimate, can be the first to use the maximum range and appropriate for small files, with accurate readings. Cannot be used to measure small current file current. In order to prevent damage to the clamp type table.(6) pliers type table jaws should be closed in measurement. If there is noise after closing, the jaw can be opened once again. If the noise still can not be eliminated, it should check whether the joint surfaces of the magnetic circuit are bright and clean, and wipe clean when there is dirt
Because the clamp table itself is of low precision, small current measurement, can adopt the following methods: first, the measured circuit of the wire around a few times, were measured and then put into the jaw. The table clamp clamp meter indicating the current value of the actual value is not measured, the actual current when the number of winding for the readings divided by the wire clamp meter.
