What are the common faults and solutions of clamp ammeter
(1) When using a high-voltage clamp meter, attention should be paid to the voltage level of the clamp ammeter, and it is strictly forbidden to use a low-voltage clamp meter to measure the current of the high-voltage circuit. When measuring with a high-voltage clamp meter, it should be operated by two people. Non-duty personnel should also fill in the second work ticket when measuring. They should wear insulating gloves when measuring, stand on insulating mats, and do not touch other equipment to prevent short circuit or grounding.
(2) When observing the timing of the watch, special attention should be paid to maintaining a safe distance between the head and the live part. The distance between any part of the human body and the live body should not be less than the entire length of the clamp meter.
(3) When measuring on a high-voltage circuit, it is forbidden to use wires to connect the clamp ammeter to another meter for measurement. When measuring the current of each phase of the high-voltage cable, the distance between the cable ends should be more than 300mm, and the insulation should be good, and the measurement can only be carried out when it is considered convenient.
(4) When measuring the current of low-voltage fusible fuses or horizontally arranged low-voltage busbars, the fusible fuses or busbars of each phase should be protected and isolated with insulating materials before measurement to avoid short-circuit between phases.
(5) It is strictly forbidden to measure when one phase of the cable is grounded. Prevent personal safety from being punctured and exploded due to the low insulation level of the cable head.
(6) Pull the switch to the maximum range after the measurement of the clamp ammeter to avoid accidental overcurrent during the next use; and it should be stored in a dry room.
Clamp Meter Solutions
(1) When measuring current or voltage, one or several gears have no indication, and other gears indicate normal. The reason is that the fastening switch screw of the clamp meter is loose, or the connection wire on the branch switch is twisted off. This kind of failure is the most common, just connect the broken wire after opening the cover.
(2) The reading of the current file is too small, and the reading of the voltage file is normal. Most of the reasons are due to poor contact of the jaws and too much magnetic flux leakage. The jaws should be corrected to make them in good contact. This kind of fault is sometimes caused by short circuit between windings, and it is more troublesome at this time. Generally speaking, it is necessary to rewind according to the original data, and aging treatment is also required.
(3) The readings of the current and voltage files are all low, which often occurs on internal magnetic clamp meters. The reason is that the magnet is demagnetized, which should generally be solved by magnetization, and it can also be adjusted by reducing the resistance value connected in series with the meter branch.
(4) If the reading of one of the gears is inaccurate, the corresponding resistance should be adjusted.
(5) The indication of the voltage gear is normal, and there is no indication of all the current gears. Use a multimeter to check the primary wire switch and secondary winding to see if there is any abnormality.
(6) All without instructions. Check the rectifier diode, meter head, switch, and the wiring connected to or related to the clamp meter for breaks.
