Clamp Table - Methods and Steps for Judging Short and Open Circuits
Check circuit connections
Firstly, we need to check the connection status of the circuit. If the wires in the circuit are loose or disconnected, it may cause an open circuit in the circuit. We can check the wiring connection of the circuit, especially the plugs, sockets, switches, etc. in the circuit. If any looseness or damage is found, it can be repaired or replaced.
Using a voltmeter and ammeter
The use of voltmeter and ammeter is a common tool for diagnosing circuit faults. By measuring the voltage and current values in the circuit, we can obtain some key information to help determine short circuits and open circuits. Firstly, we need to correctly connect the ammeter and voltmeter to the circuit and make corresponding settings. Then, we can measure the voltage and current of each node one by one.
Judging short circuit
If an abnormally high current value is measured in the circuit and the voltage value is lower than the expected value, it is likely that a short circuit fault has occurred. In this case, the current bypasses the path it was originally intended to pass through, resulting in an increase in current and a decrease in voltage. To further confirm the location of the short circuit, the following steps can be taken:
Segmented inspection method: Divide the circuit into several sections and check the wiring and components of each section one by one to determine the specific location of the short circuit.
Short circuit heating method: Touch detection is performed at the location where a short circuit may occur. If there is obvious heat, it is a candidate for the short circuit location.
Short circuit locator: Use a professional short circuit locator or mutual inductance coupling device to locate short circuits in power lines or faulty circuits.
Judging open circuit
If a very small or near zero current value is measured in the circuit, and the voltage value is lower than the expected value, it is likely that an open circuit fault has occurred. In this case, the current cannot flow through its original path, resulting in almost no change in current. To further confirm the location of the circuit breaker, the following steps can be taken:
Segmented inspection method: Divide the circuit into several sections and check the wiring and components of each section one by one to determine the specific location that caused the current interruption.
Using a continuity tester: Use a continuity tester to check if the wiring and components in the circuit are conducting, in order to determine the location of the open circuit.
Component replacement method: Replace each component in the circuit one by one and observe whether the normal operation of the circuit can be restored. If the circuit returns to normal after replacing a certain component, it indicates that the replaced component may be the cause of the open circuit.
