[time-nuts] EFC tracking

jimlux jimlux at earthlink.net
Sun Jun 27 00:10:24 EDT 2010


Didier Juges wrote:
> I can only guess at what a sound card with linearity specs
> approaching those of the AD kit would cost, and it's still AC
> coupled, and as Poul pointed out, has no long term stability spec.

This *is* an issue.. the audio ADCs have great performance in the "sub 1 
second" sort of regime.. small variations in gain or offset would have 
no impact on audio applications, but would be a problem with the EFC 
measurement..


> 
> To me, it sounds like a no brainer, pun intended :)
> 
> Alternately, my last HP3456A cost me about $50, and that's a 6 digit
> DVM with decent specs. You will need an HPIB controller though, if
> you do not already have one.
> 

There is that...








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