When using a multimeter, here are three tips
1. Use a multimeter to test whether the wires are connected.
First confirm that there is no voltage at both ends of the wire. DC voltage or AC voltage may damage the multimeter, and then use the resistance setting of the multimeter to measure the resistance of the wire. Some multimeters have a continuity measurement setting that can directly measure whether the wire is connected.
Use the on-off setting or the minimum ohm setting of the multimeter. If you hear a "beep" sound at both ends of the measuring wire or the ohmmeter points to zero, it means there is continuity. Otherwise it doesn't make sense. If the line to be measured is long, you can use one line as the common line and measure the others on it.
If the multimeter has a buzzer, use the buzzer setting. If the multimeter does not have a buzzer, use the resistance setting. If the buzzer sounds or the resistance value is infinite, it means the wire is connected, otherwise it means it is broken.
2. Use a multimeter to check whether the wire is connected or not.
Generally, one end is connected and the two conductors are measured. If the measured value is zero, it means there is a path. If there is a resistance value, it means a short circuit. To measure the insulation performance of the two conductors, separate the other end. If there is a resistance value, it means the insulation performance is good (resistance The value depends on the insulation material, cable length, environment or the temperature of the cable itself). The absence of any resistance value indicates that the cable is routed or grounded.
3. Use a multimeter to check whether the line is smooth
Insert the red and black test leads into the resistance hole and COM hole respectively, turn on the power of the multimeter, and set it to the minimum resistance level. Touch the pen tips of the two meters to check whether the meter is normal. If the meter displays zero or a few tenths, it is normal. Then insert the tip of the meter pen into both ends of the line being tested. If the meter shows zero or a few tenths, it means the line is connected. If there are resistors or other electrical appliances in the circuit, turn the resistance setting to a high value and continue measuring. The reading differs according to the resistance value of the series. Be sure to cut off the power supply of the line under test before measurement.
