Methods for Measuring Live and Neutral Wires with a Multimeter
1. Set the multimeter to AC mode, and I set it to AC 750V mode. If you want a more intuitive view, you can set it to a smaller AC voltage mode. It depends on the situation!
Suspend the black probe (just put it aside) and insert the red probe into the socket to be tested. The hole with a larger reading is the live wire. You can see that when the red probe is placed in the socket above, the reading displayed is "4". Remember this number.
2. Then put the red probe into the socket below and try again. You can see that the reading this time is "17", which is significantly larger than the previous measurement! This indicates that the hole is the live wire!
3. Next, use a test pen to verify the accuracy of the test results! Insert the test pen into the hole with the highest reading on the multimeter. You can see the neon tube glowing, indicating that it is a live wire!
4. Use a test pen to test the socket on top, and you can see that the neon tube is not emitting light, indicating that it is the neutral wire.
5. Through the above tests, it can be seen that using a multimeter to distinguish between neutral and live wires is feasible!
Advantages of pointer multimeter and digital multimeter
1. A pointer multimeter is an average value instrument with intuitive and visual reading indication.
2. A pointer multimeter generally does not have an amplifier inside, so the internal resistance is relatively small.
3. The pointer multimeter has uneven frequency characteristics due to its low internal resistance and the use of discrete components to form a shunt and voltage divider circuit.
4. The pointer type multimeter has a simple internal structure, so it has lower cost, fewer functions, simple maintenance, and strong overcurrent and overvoltage capabilities.
5. A pointer multimeter has a high output voltage and current, making it easy to test thyristors, light-emitting diodes, and other devices.
