How do you test a transformer using a multimeter?

To test a transformer using a multimeter, first ensure that the power supply is disconnected for safety. Set the multimeter to the resistance (ohms) setting, and measure the primary winding’s resistance by placing the probes on the input terminals. Next, measure the secondary winding’s resistance in the same manner. You should check for a low resistance value in both windings, indicating intact wire. If either winding exhibits infinite resistance, it may indicate a break in the coil. Additionally, for a thorough assessment, you can check for any shorts between the windings and the core. To further evaluate insulation, a megohmmeter can be used for testing dielectric strength and insulation resistance. It’s essential to follow safety protocols throughout this testing to avoid hazards. For more complex analyses, such as insulating oil diagnostics, consider using industry-specific testers like those from Globecore, which provide comprehensive evaluations of transformers and their operational status.