How to measure frequency response of a 1:1 transformer - diyAudio
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Old 28th November 2012, 09:46 AM   #1
Gunders is offline Gunders  Norway
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Join Date: Nov 2002
Location: Norway
Default How to measure frequency response of a 1:1 transformer

How can I measure the frequency response, open circuit impedance and short circuit impedance for a 1:1 transformer with a signal generator and a oscilloscope(+ resistors or/and other passive components if necessary)?

For the frequency response; Can I just connect the generator at the primary and the oscilloscope at the secondary and do a frequency sweep or is the process more sophisticated.

Thank you
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Old 28th November 2012, 12:24 PM   #2
DF96 is offline DF96  England
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Join Date: May 2007
Yes, with care. You need to know about AC potential dividers, so amplitude and phase matter. Frequency response for a transformer depends on source and load impedance, so the transformer itself does not have a response. Also be aware that capacitive loading from scope probes can distort measurements: use a compensated 10:1 probe.
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Old 28th November 2012, 02:33 PM   #3
DUG is offline DUG  Canada
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Join Date: Jan 2003
Location: mississauga ontario canada
What is the designed load impedance for the transformer?

IF it is a 600R 1:1 then I would test it as in the .jpg.

If you are not going to use it in a 600 ohm source system and just drive it direct then eliminate R1.

That is how I would do it.

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File Type: jpg 600R-trans-test.jpg (9.3 KB, 48 views)
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