From: phil_a@tpg.com.au   
      
   "GRe"   
   >   
   > "Don Pearce"   
   >>>   
   >> Could you explain these tests in a little more detail? I'm not sure   
   >> why the inductance appears to be dependent on the voltage.   
   >   
   >   
   > It's due to hysteresis losses of ferromagnetic materials like the   
   > lamination in transformers.   
      
      
   ** You have made a big mistake by separating Don's Q from the original   
   context.   
      
      
   > Take f.e. a mains transformer and measure the current trough the primary,   
      
      
   ** Irrelevant to the falling L value at lower levels in your tests.   
      
    That has to do with falling permeability of the core at low I mags.   
      
    Odds on the core is made of ordinary transformer steel rather than Mu-metal   
   or similar.   
      
      
   ....  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)