# You asked: How do you test a 3 phase transformer with an ohmmeter?

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## How many ohms should a transformer read?

Look for a reading of somewhere between one and about 10 ohms. If any winding reads higher than 10 ohms you have probably found a bad transformer. Unless you didn’t get a good connection to the coil leads with your test leads. Always check at least 3 times before you draw a conclusion.

## How do you know if a transformer is shorted?

A suspected short can be checked with an ohmmeter across the secondary winding with the source and load disconnected. If there is a short, the meter will read 0 Ω. Again the meter should be on a low scale.

## How do you troubleshoot a transformer?

How to Troubleshoot a Low-Voltage Transformer

1. Identify the transformer’s terminals, using its label as a guide. …
2. Turn a multimeter to its VAC function. …
3. Test the transformer’s input voltage with the multimeter, using the transformer’s label as a terminal guide. …
4. Test the transformer’s output voltage with the multimeter.

## How do you test a transformer with an ohmmeter?

To test your transformer, simply touch the red and black pins of your ohmmeter to the opposite ends of the transformer’s wiring. Read the display and compare the resistance on your ohmmeter to the resistance stated on the transformer’s data sheet. This is sometimes listed on the transformer’s enclosure.

## What is the resistance of a transformer?

A basic transformer has two windings that are wound around an electromagnetic core. When AC voltage is applied to one of the windings, it creates a magnetic field, which is amplified by the electromagnetic core.

4. Perform the resistance test.

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Terminal 1 Terminal 2 Result (Ohms)
Brown Green Open circuit
Red Green 8.63

## Should a transformer have continuity?

The transformer is probably okay. There should not be any continuity between the primary and the secondary on a normal transformer. Raw resistance only gives a rough idea of the viability of a transformer…the real measure is inductance, but that takes other tools to measure.