How does a component tester work?

A component tester evaluates the functionality of individual electronic components, such as resistors, capacitors, and transistors, by applying specific test signals and measuring the response. It typically uses a combination of voltage, current, and frequency measurements to assess parameters like resistance, capacitance, and gain. The tester then compares the measured values against predefined standards to determine if the component is functioning correctly. Some advanced testers may also provide diagnostic features to identify faulty components based on their performance characteristics.