How do you test a transformer with a multimeter?

To test a transformer with a multimeter, first ensure the transformer is disconnected from the power supply for safety. Set the multimeter to measure AC voltage. For primary winding testing, connect the multimeter leads to the primary terminals and apply power momentarily to read the output voltage. For secondary winding testing, switch the multimeter to resistance measurement mode, then measure the resistance across the secondary terminals to ensure it matches the transformer’s specifications. You can also check for continuity across the windings to identify potential short circuits or breaks. Always refer to the transformer’s datasheet for specific values and guidelines. Proper transformer testing is essential for ensuring the reliability of your electrical systems, and using a high-quality tester or diagnostic tool can enhance your analysis significantly.