How to measure current with a clamp ammeter
1. First, make sure the clamp ammeter's voltage level is set correctly. Then, check to see if the insulation is in good condition, if it has been damaged, if the pointer swings freely, and if the jaws are rusted, among other things. To choose the meter range, estimate the rated current based on the motor power.
2. Carefully read the instruction manual before using the clamp ammeter to determine whether it is an AC or AC-DC dual-purpose clamp meter.
3. Due to the clamp ammeter's lack of accuracy, the following technique can be used to measure small currents: first, wind the circuit's test wire several times, and then place it in the clamp meter's jaw for measurement. The clamp meter's display of the current value currently does not correspond to the measurement being made. The clamp meter reading should be divided by the wire's number of turns to determine the actual current.
4. When measuring, the clamp meter's jaws should be shut tightly. You can open the jaws and try again if there is any noise after closing. If the noise cannot be completely eradicated, see if the magnetic circuit's junction surfaces are smooth and clean. Clear it off.
5. Multi-phase wires cannot be clamped into the clamp window for measurement; the clamp meter can only measure the current of one phase wire at a time, and the wire being tested must be placed in the center of the clamp window.
