In this video, we will see How to test a Transformer with a digital multimeter. The transformer testing method is very simple and it requires only a multimeter to test the transformer. I will also explain how to identify primary and secondary winding of a isolation step up or step down transformer.

I will request you to watch the complete tutorial video of the Transformer testing but you can also jump to any topic by click on the following Time Stamps:

00:49 How to identify the primary and secondary [high voltage & low voltage] windings.
05:07 How to check the transformer using a multimeter
07:42 How to calculate the turns ratio of a transformer

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Here I have used an isolation step down transformer. For a good transformer, the resistance of the windings should not be infinite and the resistance between the core and both windings should be infinite.
In the video, I have shown the transformer testing method in simple steps so that you can easily follow the steps while testing an isolation transformer.

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