Principles, Methods, and Techniques of Using Clamping Ammeters
When detecting circuits with ordinary ammeters, it is necessary to disconnect the circuit for instrument testing, which is not feasible for equipment that is in operation and cannot disconnect the circuit. Therefore, the research and development of clamp type ammeters lacks essential targeted ammeters. It can directly clamp the circuit for testing circuit current, leakage current, etc
Principle and structure of clamp ammeter:
The clamp type ammeter adopts a combination of a split iron core and a Hall element. When the measured current I passes through the sensor, the Hall element senses and outputs a Hall voltage VH. The measured current I can be calculated by detecting the Hall voltage VH, which 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. You can test the circuit current. The clamp meter is fully automatic gear shifting, with high accuracy, easy to carry, and can test the total current of the line, ground leakage current, line current, etc
Tips for using clamp ammeters:
(1) Before testing the circuit, check whether the insulation shell of the clamp gauge iron core is intact and undamaged. Check if the jaws are securely closed.
(2) Opening the instrument panel and displaying "OL" indicates that the instrument panel is functioning properly and can be tested
(3) When measuring, try to pass the measured wire through the center of the clamp as much as possible. You can test several times and read the value to make the reading accurate.
(4) When measuring a small current, if conditions permit, the wire can be wound a few more turns and then clamped with pliers. 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 so that the instrument is in good condition for the next use.
