Common Faults and Solutions of Clamp Ammeter

Clamp ammeters generally have the following common faults, which can be eliminated by taking corresponding measures:

(1) When measuring the current or voltage, one or more gears have no indication, while the other gears indicate normal. The reason is that the bolts fastening the switch are loose or the connection wires on the branch switch are twisted off. Usually, after tightening the bolts and opening the cover to connect the broken wires, the clamp meter can resume normal operation.

(2) The current range reading is too small, while the voltage range reading is normal. The reason is mostly due to poor contact of the jaws and too much magnetic leakage. The jaws should be corrected to make good contact. This fault is sometimes caused by a short circuit in the coil. The coil should be rewound according to the original data and insulated.

(3) The readings of current and voltage are both low. This phenomenon often occurs in internal magnetic clamp meters. The reason is that the magnet is demagnetized and should be magnetized. You can also reduce the resistance value in series with the meter branch to make adjustments.

(4) If the reading of a certain level is inaccurate, the corresponding resistance should be adjusted.

(5) The voltage range indicates normal, but the current range has no indication. Check the switch and secondary coil for any abnormality.

(6) No indication in any gear. Check the rectifier, meter head, switch, and any wiring connected to or related to the clamp meter for disconnection points.