Clamp Meter User Guide How to Choose and Purchase a Clamp Meter
1. Before use, carefully read the instruction manual to determine whether it is for AC or DC dual-use.
2. The voltage of the tested circuit cannot exceed the value indicated on the clamp meter, otherwise it may cause grounding accidents or electric shock hazards.
3. Only one phase of the wire can be measured at a time, and the measured wire should be placed in the center of the clamp window. It is not allowed to clamp multiple phase wires into the window for measurement.
4. Before measuring with a clamp meter, it is necessary to estimate the magnitude of the measured current before deciding which range to use. If it is impossible to estimate, you can first use the maximum range gear and then switch to a smaller one to obtain accurate readings. Cannot use low current range to measure high current. To prevent damage to the instrument.
5. The jaws should be tightly closed during measurement. If there is any noise after closure, the jaws can be opened and reset once. If the noise still cannot be eliminated, the joint surfaces on the magnetic circuit should be checked for smoothness. If there is dust, they should be wiped clean.
6. Due to the low accuracy of the clamp ammeter itself, the following method can be used to measure small currents: first, wrap the wire of the circuit being tested a few times, and then place it into the clamp of the clamp ammeter for measurement. At this time, the current value indicated by the clamp gauge is not
The actual value measured should be the reading of the clamp gauge divided by the number of turns the wire is wound. 7. Do not operate with electricity during maintenance to prevent electric shock.
Working principle of clamp gauge
The working principle of a clamp gauge is the same as that of a transformer. The primary coil is a wire that passes through a clamp type iron core, equivalent to the primary coil of a 1-turn transformer, which is a step-up transformer. The secondary coil and the ammeter used for measurement form a secondary circuit. When an alternating current passes through a wire, it is this coil that generates an alternating magnetic field, causing an induced current in the secondary circuit. The ratio of the current to the primary current is inversely proportional to the number of turns in the primary and secondary coils. Clamp type ammeter is used to measure high currents. If the current is not large enough, the primary wire can be passed through the clamp type ammeter by increasing the number of turns, and the measured current can be divided by the number of turns.
