When I swapped my 5370A AC fans for DC fans I was concerned that the inverter 
in the fan motors might have some effect on the performance of the 
instrument... after all,  it is measuring stuff at the part per trillion level.

I was rather surprised to see that,  if anything,  the internal jitter went 
down a couple of picoseconds (taking the standard deviation of 10,000 samples 
of the internal reference).  Granted, it is a number that tends to bounce 
around quite a bit.  Both units seemed to drop a couple if picoseconds (an 
improvement of 10-15 percent).  I did not try putting the old fans back in to 
see if the jitter increased again.

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