Measuring circuit faults with a tester pen multimeter
Lighting circuit faults in the reality of work from time to time, and hidden faults are invisible to the eye, the following to introduce you to the power test pen, multimeter to measure circuit faults.
1, with a power test pen to measure the circuit in the phase line, zero line voltage is normal, phase line neon tube is bright, the zero line is not bright is normal. Description of the fault in the indoor circuit and part of the electrical equipment. Should be carried out separately one by one, check whether the socket, bulb, refrigerator, air conditioning, water heater, etc. is normal.
2, phase line, zero line measured with a tester are bright. This means that the fault appears in the circuit of the zero line. Should find the zero line break point, zero line connector is poor contact and the exact location of the break point.
3, the phase line, the zero line with a power test pen measurements are not bright. It means that the fault occurs in the phase line of the circuit. Should look for phase line breaks and poor contact joints.
4, the knife gate in the closed position, the fuse blown. It means that the phase line and the zero line appear short circuit, should find the short circuit point and burnt part of the electrical appliances.
5, the phase line with a tester pen to measure the brightness of the neon tube darker than normal, the zero line is normal. Description of the fault appears in the phase line, caused by causes such as wire insulation is reduced, wire skin broken ocarina leakage, resulting in voltage drop, household appliances can not run normally.
6, with a power test pen to measure the phase line, zero line are not bright, the first view of the circuit of the switch, knife gate, fuse is normal, to see whether the position in the input.
7, if the indoor dark line, dark line broken, can not be replaced, and can not break the wall to check the line, should be the nearest power point in the room, with open wire connection, so that the power supply from the socket back to the circuit, to find out the fault situation, to narrow down the scope of the fault.
8, copper and aluminum wire mixing is strictly prohibited, long time contact oxidation, wire breakage, endangering the personal safety of pedestrians.
9, lighting switch or leakage protector can not close the gate, the first load line removed, empty test switch or leakage protector, if normal, check the load carried, using a multimeter to measure the resistance (when normal) should not be zero, the measured voltage should be 220v, or vice versa, the load carried by a short-circuit phenomenon, should be replaced in a timely manner or overhaul, check the wires or lamps.
If the switch or leakage protector falls off when empty test, it should be replaced in time.
