[time-nuts] FE-5680A temp coefficient seems to be -7E-12 per degree C

EWKehren at aol.com EWKehren at aol.com
Wed Dec 21 16:46:31 EST 2011

I hope this picture goes through. I did mount the pictured heat sink on it  
and when I started to look at long term I realized I had to temperature 
control.  I am holding the heat sink at 37 C within  0.1 C and over now three 
weeks  no aging and the stability 1 E-12. I am surprised and impressed. 
Bert Kehren
In a message dated 12/21/2011 1:56:15 P.M. Eastern Standard Time,  
beale at bealecorner.com writes:

My  measurements on one FE-5680A Rb sample indicate a temperature 
coefficient  of -7E-12 per degree C (T measured at exterior case top 
center); more  details below. Can anyone opine if this is a reasonable 

I can't  say anything about long-term drift until I stabilize the case 
temperature.  Currently experimenting with a variable-speed fan and PID 
controller  looking at a thermistor attached to the case, to that  end.

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