output transformers measurement. Off topic?

[Nick England]

How about using a simple voltage divider -
Connect an audio oscillator (say 2v at 1 kHz) across the series combination of
a 10K resistor and the transformer primary. Measure the voltage across the
resistor and across the primary.
Primary_impedance = 10K*primary_volts/resistor_volts.

This assumes you have the proper secondary load - make your best guess about
the 8 ohm winding and put an 8 ohm load there. If you aren't sure, vary the
secondary load connection and observe the results on the primary and make an
average estimate.
--------------------------
cheers,
Nick KD4CPL

----- Original Message -----
From: "Murray Grandy" <mgrandy at TELUS.NET>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Friday, March 19, 2004 8:21 PM
Subject: output transformers measurement. Off topic?


> Does anyone know of test equipment that will determine the impedance of
> output transformers. Did Heath make any such thing. I have a bunch of
> unmarked transformers and would like to know what they are. I'm talking
> about the primary, primarily. Hi Hi.
> Murray

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