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How to measure transformer impedance? | All About Circuits
https://forum.allaboutcircuits.com/threads/how-to-measure-transformer-impedance.37161/#:~:text=To%20measure%20the%20output%20impedance%20at%20the%20secondary,measure%20the%20output%20voltage%20with%20no%20load%20connected.
Chapter 5: Understanding Impedance In Audio Transformers
http://www.lundahl.se/wp-content/uploads/datasheets/PSW_WhitePaper_Download_Chapter_5.pdf
As mentioned above, all audio input and output circuits, all loudspeakers, all microphones, and all transformers use impedance as a measurement of electrical value. This is because they are AC devices, not simple DC circuits. But among AC circuits, only transformers (and their first cousins autoformers) possess the unique property to
Audio transformer power loss and optimal impedance matching
http://kearman.com/bentongue/xtalset/5hpXform/5hpXform.html
Results are given from measurements made at three output power levels. The last measurement is with the transformers connected for a 1,200 Ohm output instead for a 300 Ohm output. Most Sound Powered elements I have seen have an AC impedance of about 600 Ohms when averaged over the frequency range of 0.3-3.3 kHz.
Audio Transformers
https://www.jensen-transformers.com/wp-content/uploads/2014/08/Audio-Transformers-Chapter.pdf
1:2 turns ratio exhibited an impedance ratio of 1:4. Transformers always reflect impedances from one winding to another by the square of the their turns ratio or, expressed as a formula: Zp/Zs = (Np/Ns)2 where Zp is primary impedance, Zs is secondary impedance, and Np/Ns is turns ratio (which is the same as the voltage ratio).
How to measure transformer impedance? | All About Circuits
https://forum.allaboutcircuits.com/threads/how-to-measure-transformer-impedance.37161/
To measure the output impedance at the secondary of the transformer, as driven by the amplifier, do this: Apply a 1 kHz signal to the input of the amplifier, so that the output is not too large, but easily measurable, perhaps 1/10 volt. Carefully measure the output voltage with no load connected.
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