>>"Your meter measures the difference in potential between it's leads. You can't get a meaningful measurement between 2 points that don't share a common reference point. Since the floating secondary is isolated from the ground they do not have a common reference and any measurement is invalid.<<"
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Thats funny Herman, I and many other electricians have used this test to find the correct phasing orientation of secondary windings of transformers for years. I have used the procedure where winding lead identication are missing. The test is reliable. Don't knock it till you try it.
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>>"Since the floating secondary is isolated from the ground they do not have a common reference and any measurement is invalid.<<"
>>>>>>>>
AHhh, but how about the grounded AC system that is feeding the primary of the isolated transformer? And that difference of potential that exists and can be measured when the floating secondary leads, is due to capacitive coupling between the primary and secondary windings. The fact is the test will match the actual polarity, phase, identifications that are known for the transformer every single time.
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Herman have you ever checked for the proper AC polarity orientation of a preamp or power amp power supply transformer? You are preforming the same test. The only difference is the secondary of the transformer is fixed so if it is reversed you change the primary. Correct?
>>>>>>
Thats funny Herman, I and many other electricians have used this test to find the correct phasing orientation of secondary windings of transformers for years. I have used the procedure where winding lead identication are missing. The test is reliable. Don't knock it till you try it.
========
>>"Since the floating secondary is isolated from the ground they do not have a common reference and any measurement is invalid.<<"
>>>>>>>>
AHhh, but how about the grounded AC system that is feeding the primary of the isolated transformer? And that difference of potential that exists and can be measured when the floating secondary leads, is due to capacitive coupling between the primary and secondary windings. The fact is the test will match the actual polarity, phase, identifications that are known for the transformer every single time.
==
Herman have you ever checked for the proper AC polarity orientation of a preamp or power amp power supply transformer? You are preforming the same test. The only difference is the secondary of the transformer is fixed so if it is reversed you change the primary. Correct?