What is a Function tester?

A function tester is a measurement device used to verify the operation of electronic devices and circuits. It is primarily used in product development and quality control stages to test the correct functioning and performance of electrical components and circuits. The tester applies an input signal and checks the output signal to assess whether the specified functions are working correctly. For example, it is used to ensure that electronic circuits in household appliances, communication devices, and automotive components operate as expected.

A function tester can measure not only basic voltage and current but also more detailed parameters such as signal waveform, frequency, response time, and ripple. This helps improve the reliability and safety of products. Additionally, function testers are often used in combination with other measuring instruments, such as oscilloscopes and multimeters, enabling a comprehensive evaluation of electronic circuits in various situations.

Application of Function tester

１．Testing Home Appliances
For instance, many electronic circuits and sensors are used in household appliances like air conditioners and refrigerators. A function tester is used to verify that these circuits operate correctly. It checks if the temperature sensors work accurately and if the internal fan motors rotate as instructed, ensuring the product functions reliably for consumers.
２．Testing Automotive Electronics
Automobiles contain numerous electronic components, and function testers are commonly used to verify their operation. For example, function testers are used to test the output signals and response times of components within the engine control unit (ECU) and brake system, ensuring they function precisely under various conditions.
３．Testing Medical Devices
Medical devices require high safety and accuracy, so function testers are used to verify that each component performs its specified function. For example, in devices like electrocardiogram monitors and blood pressure meters, function testers check that the circuits detect, process, and display data accurately, ensuring patient safety and reliability.

These examples demonstrate that function testers are widely used across industries to ensure product quality and reliability.

※Includes information on some trading companies