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Old 9th June 2011, 07:22 PM   #1
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Default Absolute phase test audio for transformers

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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Old 9th June 2011, 08:15 PM   #2
DF96 is online now DF96  England
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Measure the inductance with the windings in series, both ways round. The larger inductance is when they are in phase.
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Old 9th June 2011, 08:45 PM   #3
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Why bother with measuring the inductance when you can instantly see the phase using this waveform?
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Old 9th June 2011, 08:51 PM   #4
Enzo is offline Enzo  United States
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Nothing wrong with your scope method. His inductance method requires no application of a waveform. A hand inductance meter will do it quickly. Nothing wrong with having a number of ways to do it.
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Old 9th June 2011, 09:40 PM   #5
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I reckon attaching a DMM or other inductance meter is quicker than using software, but each to their own.
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Old 9th June 2011, 09:46 PM   #6
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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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Old 9th June 2011, 09:46 PM   #7
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Your phase test will also work for everything from amplifiers to loudspeakers.
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Old 9th June 2011, 09:48 PM   #8
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Yes it will. I discovered that one of my amplifiers inverts the phase. I didn't know that until I played the CD through the amplifier.
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Old 9th June 2011, 09:54 PM   #9
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If you are up to it a really handy test CD would be that waveform repeated for several octaves, say 20 to 20K. As a wave file it could be easily transported and would check crossovers etc.
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Old 9th June 2011, 10:07 PM   #10
DF96 is online now DF96  England
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Is your oscilloscope always handy near your CD player? Mine isn't even in the same room! I find a DMM is more portable than a CD player and 'scope. Anyway, as I said, each to their own. Sorry for raining on your parade. 8-)
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