Resistance measurement with a clamp ammeter method
Some clamp ammeters have a resistance test function. If the clamp ammeter you have has this function, you can follow the steps below to measure it.
Wire resistance measurement:
①Turn the switch to the electrical barrier of the appropriate range.
②Keep the switch in the released state.
③Connect the red test lead to the “Ω” terminal and the black test lead to the “COM” terminal.
④ Connect the red and black test leads to both ends of the wire being measured. When measuring the resistance of the wire in use, the line should be disconnected from the power supply first, and the capacitance connected to the wire should be fully discharged before measuring.
Wire continuity test
① Turn the switch to 200Ω (or buzzer).
② Connect the red and black test leads to the "Ω" terminal and the "COM" terminal respectively.
③If the resistance between the red and black test leads is less than (50±25) Ω, the built-in buzzer will sound a beep.
How to measure voltage with clamp ammeter
A clamp meter is an instrument used to measure the current of a running electrical circuit. It can measure the current without interruption of power supply. The clamp meter is actually a current transformer. The stuck wire is equivalent to the primary coil of the transformer. When there is current in the wire, magnetic flux will be generated in the core of the meter, and then in the secondary coil of the meter A current is induced. This current is equal to the current in the primary coil multiplied by the number of turns of the primary coil (it is a wire, so it is one turn) divided by the number of turns of the secondary coil. Then according to this relationship, the wire can be converted The current in it.
The clamp ammeter is actually an electromagnetic inductor. An energized wire generates a magnetic field. The intensity of the magnetic field generated by the current is different. The current value converted on the clamp meter is different due to the difference in the three-phase voltage. The current holes are different, so you can only measure the current of a single phase, and then calculate the average current. Finally, whether it is three-phase 380v voltage or two-phase 220v voltage, the method used is the same.
