[time-nuts] FE-5680A Results so far

Chris Albertson albertson.chris at gmail.com
Wed Dec 28 13:21:54 EST 2011


Just got my fe5680 yesterday.   Seems to work but the fe5680 is the most
accurate reference I have.  So how to test it?   I plan to buy a
Thunderbolt but until then, anyone have any creative ideas?

I have an HP5328A with unknown calibration.  It reads 10,000,026 Hz
I have an FCC 1 kit I assembled a few years ago and it says 9,999,993 Hz.
(I can make the FCC1 read exactly 10MHz if I place it on top of the hot
FE5680, the FCC1 is very temperature sensitive.
My old Tek scope says the period is "about" 0.1 uS and the sine wave looks
pretty good.

BTW, 5 VDC is 76.5 mA with RS232 not connected.    15 VDC is 1.5 ~ 0.8 A.
 The unit does get warm.  A 3/16 x 5 x 16 inch aluminum plate worked is a
"good enough" heat sink.


Going to have to get a Thunderbolt.  I have an Oncore UT+ the provides a
good pulse per second but that will not help

Chris Albertson
Redondo Beach, California



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