music, guitars & other obsessions

OPT Characterization Part 2

This is a follow on to my earlier post on OPT characterization. Instead of the differential amplifier, I tried using an 1:1 transformer on the output of the signal generator, so I could have floating outputs to drive the reference resistor and the transformer-under-test (“TUT”). This is the same method used by Ayumi Nakabayashi to characterize his transformers. The result was much better than the old method using the differential amplifier, since both the resistor and the TUT could be grounded on one end, making the measurement much more accurate, without noise and line interferences. Below is the resultant plot of a generic 5k SE OPT:

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