[Phil Allison[_3_]]

"GRe"
"Phil Allison"

You need a THD meter to make sense of what matters and what does not.


Input f/V/THD Output THD (600ohm terminated)

1kHz/1.0V/0.075% 0.082%
1kHz/3.6V/0.086% 0.101%

3.6V is the max. output for the audio generator.


** You need to use a much lower frequency.

Transformer non linearity is concentrated at the low end of the audio
band.


Can one simply substract THD Out/In numbers to gain THD for the
transformer only?


** To a rough approximation only.

The figures quoted above suggest the tranny is adding almost nothing.

PLUS it is crucial the source impedance be low - like 50 or 100 ohms.

Easy way is to use one channel of a good hi-fi amplifier to buffer the
output of the generator and drop the impedance to near zero.


..... Phil