A few months back I found some pages in one of my books showing a transformer out of circuit being connected in a multitude of ways across primaries, across secondaries. I believe it was a lesson about identifying polarity. Some directions would doulble voltage, some would halve the voltage, others would have varying affects. The culmination of results would allow a user to clearly identify the ratios and polarity of the transformer. I can not find that material now. Could somebody point me in the direction to find that information so a may study and learn it?
Use an ohm meter to distinguish isolated, separate windings. Three leads connected = a center tap winding.
Often the leads will be color coded in a standard way.
Transformer Lead Color Code - RF Cafe
Wiring Toriodal Mains Transformers
When you determine which is/are the primary winding(s), input a few volts from a signal generator at 60Hz,
measure the output levels for each secondary, and calculate output/input ratios for each. Then scale the
secondary outputs to a nominal 120VAC (or other local value) primary AC line input level.
To determine the relative polarities of the secondaries, connect two of them in series, and measure the total
output across the series connection. When in the same polarities they will add, and in opposite polarities subtract.
Use one of those secondary windings for testing the rest of the secondaries (if any).
Often the leads will be color coded in a standard way.
Transformer Lead Color Code - RF Cafe
Wiring Toriodal Mains Transformers
When you determine which is/are the primary winding(s), input a few volts from a signal generator at 60Hz,
measure the output levels for each secondary, and calculate output/input ratios for each. Then scale the
secondary outputs to a nominal 120VAC (or other local value) primary AC line input level.
To determine the relative polarities of the secondaries, connect two of them in series, and measure the total
output across the series connection. When in the same polarities they will add, and in opposite polarities subtract.
Use one of those secondary windings for testing the rest of the secondaries (if any).
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