Clamp ammeter principle and usage tips
When testing the circuit with a regular ammeter, it is necessary to disconnect the circuit and intervene in the instrument testing, which is not feasible for equipment that is running and cannot disconnect the circuit. Therefore, the development of clamp current meters is lacking in the essential targeted current meters. It can directly clamp the circuit to test current, leakage current, etc
Principle and structure of clamp ammeter:
The clamp ammeter adopts a combination of segmented iron core and hole element. When the measured current I passes through the sensor, the Hall element induces and outputs a Hall voltage VH. By detecting the Hall voltage VH, the measured current I can be calculated. The Hall voltage VH is proportional to the measured current I. The wire passing through the iron core becomes the primary coil of the current transformer, and the current in the circuit is induced in the secondary coil. We can test the line current. The clamp gauge is a fully automatic shifting device with high precision, easy to carry, and can test the total current, ground leakage current, and line current of the circuit
Tips for using clamp current meter:
(1) Before inspecting the circuit, check whether the insulation shell of the clamp shaped meter iron core is intact and undamaged. Whether the jaws are securely closed.
(2) Open the instrument panel and display "OL", indicating that the instrument panel is functioning properly and can be tested
(3) When measuring, try to pass the tested wire through the center of the clamp as much as possible. You can test several times and read the value to ensure accurate reading.
(4) When measuring small currents, if conditions permit, the wire can be wound a few more times and then clamped with a clamp. The value tested in this way is a multiple of the number of wire turns, and the value is relatively accurate
(5) After the inspection is completed, close the instrument and clean the jaws to ensure that the instrument is in good condition for the next use.
