From: phil_a@tpg.com.au   
      
    "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.   
   >   
   > I used the function generator HV-output(600ohm) for this test.   
   >   
   > Input f/V/THD       Output THD (600ohm terminated)   
   >   
   > 200Hz/10V/0.036%    0.049%   
   > 100Hz/10V/0.037%    0.077%   
   > 50Hz/10V/0.037%    0.170%   
   > 25Hz/10V/0.036%    0.442%   
      
      
   ** No "function generator"  I ever heard of has THD figures as low 0.036%.   
      
       Post a link for the one you have.   
      
      
      
   >> PLUS it is crucial the source impedance be low - like 50 or 100 ohms.   
   >   
   > In this case it does'nt seem to make a difference using the function   
   > generator 50ohm or 600ohm output,   
      
      
   ** Something is very fishy with your testing and that generator.   
      
      
   >> 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.   
   >   
   > Only handy in the living room, not on the bench.   
      
      
   ** Stop being such a PITA twat.   
      
    I posted HOW to do it  -  whether YOU  have such an amp handy or not is   
   YOUR problem.   
      
    What a tedious piss head.   
      
      
      
   ...  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)