Five points for attention when the multimeter measures the short circuit of the line
Use the buzzer gear of the multimeter to measure the short circuit, connect the test leads of the multimeter together, and the multimeter beeps, indicating that the line is connected. There is a beep, indicating that there is a short circuit.
Precautions for measuring short circuit with multimeter
Before using the multimeter to measure whether the line is short-circuited, first turn off the main gate of the power supply, and then use the 1 or 10 ohm range of the multimeter to measure the two wire ends of the same group of loops. When the resistance is close to zero, it indicates a short circuit.
1. Mechanical zero adjustment
Before using the multimeter to measure the short circuit, first perform a "mechanical zero adjustment" on the multimeter. When there is no electricity to be measured, the pointer of the multimeter should point to the position of zero voltage or zero current.
Recommended reading: The method of mechanically zeroing the multimeter
2. Ensure safety
When measuring whether the line is short-circuited, do not touch the metal part of the multimeter test lead with your hands. One is to ensure the accuracy of the measurement, and the other is to ensure personal safety.
Five points for attention when the multimeter measures the short circuit of the line
3. Do not change gears during measurement
When measuring a certain amount of electricity, it is forbidden to change gears while measuring, and when measuring high voltage or high current, it is strictly forbidden to change gears during the measurement process, so as not to damage the multimeter.
When using the multimeter to measure the short circuit of the line, if you need to change the gear, disconnect the test leads first, then change the gear and continue the measurement.
4. Horizontal placement
In order to ensure the accuracy of the measurement results, when using the multimeter to measure whether the line is short-circuited, it must be placed horizontally.
In addition, pay attention to whether the rotating magnetic field has any influence on the multimeter, so as to avoid the influence of the external magnetic field on the measurement results of the multimeter.
5. The maximum range of AC voltage
After the multimeter is used, set the transfer switch to the maximum AC voltage, and must not withdraw the multimeter without returning it, so as to affect the measurement accuracy of the subsequent multimeter range.
When the multimeter is not used for a long time, it is necessary to remove the battery inside the multimeter to prevent the battery from corroding other devices in the meter.
The above are the five precautions when the multimeter measures short circuit, I hope it will be helpful to everyone.
