Multimeter detects short circuit, open circuit and grounding, with short circuit and open circuit knowledge
With a small multimeter, you can detect whether there is a short circuit or open circuit in the circuit. You can also use a multimeter to measure whether it is grounded, whether there is a connection, etc. At the end of the article, there is a little knowledge of short circuit and open circuit for everyone to learn and reference.
Multimeter to detect short circuit and open circuit
1. Short circuit
Power off before measurement, use the ohm gear of the multimeter to measure, red and black test leads to measure the live wire and ground wire, and the meter becomes low resistance, indicating that there is a short circuit.
2. Circuit break
When measuring the open circuit, keep the power on, use the voltage block of the multimeter to measure, measure the live wire and the ground wire with the red and black test pens, and the electric meter is at zero voltage, that is, the open circuit.
Multimeter detects short circuit, open circuit and grounding, with short circuit and open circuit knowledge
3. Ground
When measuring whether it is grounded, it should be carried out when the circuit is energized. Use the voltage block to measure. The red and black test pens measure the live wire and the ground wire. The meter has no voltage, that is, it is not grounded.
4. Access
It is also very convenient to use a multimeter to detect whether there is a path. There is a certain resistance, and there is a beeping sound. Short circuit: zero resistance. There is a beep. Open circuit: The resistance is infinite. No beep.
what is short circuit
A short circuit is when a circuit or part of a circuit is shorted. If the two ends of the load and the power supply are connected by wires, it is called a short circuit.
The current is very large during a short circuit, and the current supplied by the power supply during a short circuit is much greater than the current supplied by the open circuit.
Under normal circumstances, no short circuit is allowed. If the short circuit is serious, the power supply or electrical equipment will be burned out.
What is a circuit breaker
Open circuit (open circuit) refers to the state where the circuit is not closed, or the wire is not connected, or the electrical appliance is burned out or not installed (such as connecting a voltmeter in series in the circuit), that is, the entire circuit is disconnected somewhere.
The above is the knowledge of multimeter to measure short circuit and open circuit, I hope it will be helpful to everyone.
