How to Test Communication Relay with a Multimeter: A Step-by-Step Guide

Testing a communication relay with a multimeter is a critical process for ensuring the proper functionality of relays used in communication and control systems. Relays play a vital role in switching electrical signals on and off, making them indispensable components in many devices, from simple home appliances to complex communication systems. If you’re encountering issues with a relay, testing it using a multimeter is one of the most straightforward methods to diagnose potential problems. In this guide, we’ll walk through the process of testing a communication relay using a multimeter, including how to check the coil, contacts, and switching operations.