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RE: 38H OPT for 845, so so?

Please decribe the test set up.
What I said before that the set up I described is similar to the real use of the OT trafo.
This make a great difference.

Also regarding the signal test.
When you say that the Zsource is 1400 ohm is a partial information. Also are missing the specs of the trafo you are testinig and the voltage of test.
And ther isn't way to get the BW you show with a real OT trafo s.e or p-p due the parasitic components. As shown on diagram of the three trafos

When I test the OT, the differential probe I use ( due to the high voltage I get) has a 200 kHz of BW and a low capacitance.




Walter

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