Voltage measurement with a clamp-type amperemeter
How to measure voltage with a clamp ammeter
A clamp meter is an instrument used to measure the current of a running electrical circuit, which can measure the current without interruption. A clamp meter is actually a current transformer, and the stuck wire is equivalent to the primary coil of the transformer. When there is current in the wire, magnetic flux is generated in the iron core of the meter, and then a current is induced in the secondary coil of the meter. This current is equal to the current in the primary coil multiplied by the number of turns in the primary coil (i.e. a wire, so one turn) divided by the number of turns in the secondary coil. Based on this relationship, the current in the wire can be converted.
A clamp ammeter is actually an electromagnetic inductor. A wire that is energized generates a magnetic field, and the magnitude of the current produces a different magnetic field strength. The current value converted on the clamp ammeter is different due to the difference in three-phase voltage, so the current holes on each phase are different. Therefore, only single-phase current can be measured, and the average current can be calculated after that. Finally, whether it is a three-phase 380V voltage or a two-phase 220V voltage, the method used is the same.
The clamp ring of a clamp type multimeter is designed to measure current, but since a clamp type multimeter is called, it does not only measure AC current.
Many clamp meters have functions such as measuring resistance and AC/DC voltage. Simply put, the functions on a regular multimeter can be achieved on a clamp multimeter. Many clamp meters have the function of measuring DC current, but currently most of them use probes instead of clamp rings.
Adjust to the current level and directly clamp the wire to be measured with a caliper.
Some clamp gauges can measure voltage, while others cannot. Those that can measure voltage are equipped with probes. Insert the probes into the corresponding holes, adjust them to the voltage level, and put two probes on the voltage points to be measured, such as a live wire and a neutral wire.
