From: phil_a@tpg.com.au   
      
   ** Hi tubeheads,   
      
   these JPEGs were taken late in 2009 using my Rigol DSO.   
      
   The first is a 1kVA step down ( 240V to 120V) E -Core transformer with no   
   load.   
      
   http://sound.au.com/tmp/surge-002.jpg   
      
   The second is a commercial powered speaker with in built 200 watt SS   
   amplifier using a 300VA toroidal tranny.   
      
   http://sound.au.com/tmp/surge-001.jpg   
      
   The smaller current peaks are due to filter electros charging.   
      
   The moment of switch on was close to a zero crossing of the AC supply -   
   with the voltage going positive.   
      
   See the captions.   
      
   Note how the transformer current surges are all the same polarity and peak   
   as the AC voltage is crossing zero.   
      
      
      
   ...  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)