The working principle of the contact resistance tester is based on Ohm's law. It determines whether the current present in the circuit is normal by measuring the resistance value inside the electrical components. The tester connects a voltage source to the electrical component being tested, while also connecting an ammeter (or voltmeter) to the other end of the circuit. Then, the tester will measure the internal current and voltage values of the electrical components and calculate the total resistance value in the circuit using Ohm's law. If the measured resistance value exceeds the allowable range, it means that there may be a fault or damage in the circuit. At this point, it is necessary to conduct more in-depth inspection and repair of electrical components. The contact resistance tester can be used to test various circuits, electrical components, and systems, such as generators, cables, relays, switches, etc.
