How to use a digital multimeter to measure circuit continuity
The Method of Measuring Zero Fire Line with a Digital Multimeter
1. Turn the conversion switch of the multimeter to the AC 250V or 500V position, connect either probe to the power supply, and connect the other probe to ground (such as a water pipe or a damp place).
When the reading of the multimeter approaches 220V, the measured point is the live line.
3. If the needle does not move and the multimeter's conversion switch is lowered to the lowest gear one by one, and there is still no obvious reading, then the measured point is the zero line.
4. If there is no ground connection, the method can be used: turn the conversion switch of the multimeter to the highest level of AC voltage, connect any probe to the measured point of the power supply, hold the other probe with your index finger and thumb, and if the multimeter reads, the measured point is a live wire; If the pointer of the multimeter does not move, it is the zero or ground wire.
How to use a digital multimeter to measure whether a circuit is powered on or short circuited? The method is as follows:
1. Is the line unobstructed
Set it to the resistance or diode buzzer position and measure between the two wires of the circuit. If the value shows close to 0 ohms or the buzzer sounds, it indicates that the circuit is smooth; If the value shows 1 or the buzzer does not sound, it indicates an open circuit in the circuit.
2. Is the circuit short circuited
Set it to the resistance or diode beep position and measure between the two wires of the circuit. If the value shows close to 0 ohms or the buzzer sounds, it indicates a short circuit between the two wires of the circuit; If the value shows 1 or the buzzer does not sound, it indicates that the two wires of the circuit are normal and there is no short circuit.
