[time-nuts] SR-620 cal

SAIDJACK at aol.com SAIDJACK at aol.com
Wed Feb 23 22:40:52 UTC 2011


Hi guys,
 
need some help with a cal on my SR-620 counter.
 
In frequency measurement mode the unit always has an offset of up to  
+/-2E-010 after auto-cal when feeding the same 10MHz to the (A) input and to the  
external reference. It should not have any offset of course.
 
Stanford says "the accuracy spec is +/-3.5E-010, so your unit is within  
spec". Sigh. that's a crappy spec I should say..
 
Is this normal? On the Agilent counters I get 0.0 perfectly when  averaged 
when doing that test with the carrier subtracted, no matter what gate  time 
I use.
 
Any help would be great, as I have to decide if I pay Stanford to do the  
cal, and they won't guarantee that the unit will perform any better 
whatsoever  after spending $500 for the calibration..
 
Thanks,
Said
 
 


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