(1) When measuring current or voltage, one or several levels have no indication, while other levels have normal indications. The reason is that the fastening switch screw of the clamp type meter is loose, or the connection on its branch switch is twisted. This type of fault is common. After opening the cover, the broken wire can be connected properly.

(2) The current reading is relatively small, while the voltage reading is normal. Most of the reasons are due to poor contact between the jaws and excessive magnetic leakage. The jaws should be corrected to ensure good contact. This type of fault is sometimes caused by a short circuit between windings, which is more troublesome. Generally, it is necessary to rewind according to the original data and undergo aging treatment

(3) The reading of the current and voltage ranges is low, which often occurs on internal magnetic clamp type ammeters. The reason is that the magnet demagnetizes and should generally be magnetized to solve the problem. It can also be adjusted by reducing the resistance value connected in series with the meter head branch

(4) If one of the readings is inaccurate, the corresponding resistance should be adjusted

(5) The voltage level indication is normal, but the current level is not indicated. Use a multimeter to check the primary switch and secondary winding for any abnormalities

(6) There is no indication at all. The rectifier diode, meter head, switch, and wiring connected to or related to the clamp meter should be checked for any breaks