What is the purpose of test equipment that features a "test button"?

The purpose of test equipment that includes a "test button" is primarily to simulate a fault condition during testing. When the test button is pressed, it generates a specific response in the circuit that mimics a fault. This allows technicians or inspectors to assess the performance of the testing device and ensure that it can detect issues effectively under controlled conditions. By simulating various fault conditions, the equipment helps verify that safety systems and protective devices, such as circuit breakers or fuses, are functioning correctly and will respond as intended during actual fault scenarios.

This functionality is critical in ensuring that both the test equipment and the system being tested are reliable and capable of identifying real faults in operational situations. Hence, the inclusion of a test button provides valuable reassurance regarding the integrity and performance of electrical systems.