How to use a measurement of three phase current
Clamp type table close to the closed jaw during measurement, after the closure of such as noise, can open a jaw full weight, if still can not eliminate noise, should check the magnetic circuit the jointing surface is smooth, with dirt to wipe clean.
Current clamp meter only measuring one conductor, the measured wire clamp should be placed in the center of the window, the window with all phase conductors can not measure.
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 in clamp meter. The current clamp meter indicating the value of the actual value is not measured, the actual current should be divided by the wire clamp meter readings for winding the coil number.
1. First, select the voltage level of the clamp type ammeter correctly, check whether the insulation is good, whether it is damaged or not, whether the pointer is flexible, whether the jaw is rusted or not. The rated current is estimated according to the motor power to select the range of the meter.2, in the use of clamp ammeters should carefully read the instructions, it is AC or AC / DC clamp meter.
The three-phase current needs to be detected by one phase and one phase. After all, there is a phenomenon of unbalanced three-phase current.
