Absolute phase test audio for transformers

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I have a number of transformers and needed to see the absolute phase of each transformer winding.
In the past, I've applied low voltage ac to one winding and compared the phase of the other windings with that voltage.
I've come up with an easier and faster method of measuring the absolute phase of the transformer windings.

Using Adobe Audition, I generated a 120Hz sine wave with alternate positive-going portions of the sine increased in level by 10dB.

When I feed this waveform into one of the transformer windings, I connect an oscilloscope to the other windings (one at a time) and can clearly see the absolute phase of the winding as compared with the input winding.
 

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  • 120Hz testing sine.jpg
    120Hz testing sine.jpg
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No it's not quicker. By applying audio, you can instantly see the phase without the need of reversing the transformer connections.
There is no software either. I used the software to create the waveform and burned it to a CD. I merely play the CD and feed the audio into the transformer. It's fast and accurate.
 
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