How to measure voltage and DC with a clamp ammeter
How to measure voltage with a clamp ammeter
A clamp meter is an instrument used to measure the current level of an operating electrical circuit, which can measure the current without interruption. The clamp type 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 it is one turn) divided by the number of turns in the secondary coil, and based on this relationship, You can convert the current in the wire.
A clamp type ammeter is actually an electromagnetic inductor, where a wire that is energized generates a magnetic field, and the magnitude of the current produces a different magnetic field strength. The current values converted on the clamp type ammeter are different due to differences 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 set for measuring current, but since the 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 an ordinary multimeter can be achieved with a clamp type multimeter. Many clamp meters have the function of measuring DC current, but currently most of them use a pen instead of a clamp ring.
Adjust to the current level and directly clamp the wire to be tested for current with a clamp.
Some clamp meters 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.
Can a clamp ammeter measure direct current
A clamp ammeter is a specialized instrument for measuring AC current. Its front end is a current transformer. It achieves measurement tasks through the principle of electromagnetic induction.
A clamp type ammeter cannot test direct current because direct current does not have an alternating magnetic field, so no secondary current is generated in the clamp type transformer. Therefore, it is impossible for a clamp type ammeter to measure direct current.
Clamp type ammeters are generally used to test AC current. It is made based on the principle of AC snail current, similar to transformers, and obtains signals through electromagnetic induction. I use ammeters that measure direct current in series on a circuit, but theoretically, it is possible to make a DC clamp ammeter. The method for measuring direct current using an AC and DC clamp ammeter is similar to the method for measuring AC current using an AC clamp ammeter. Select the appropriate range, clip a wire to test the current into the center of the clamp, and the corresponding current will be displayed on the display screen.
