[time-nuts] DIY FE-5680A lobotomy (disable temp compensation)

Scott Newell newell+timenuts at n5tnl.com
Sun Jun 29 13:55:45 EDT 2014


At 11:01 AM 6/29/2014, Chris Albertson wrote:
>Scott,
>
>Could I ask you to post that "C crap" someplace?  Would save me and
>others some time.

It was posted back in 2012:
http://n5tnl.com/time/fe-5680a/control/fe5680_logger.c

Beware that the comments may be inaccurate. We now know more about 
the commands than we did then. There's also a win32 .exe or two in 
that directory.


I'll post something newer. This version spits out the time, the 4 ADC 
values, the two internal DDS tuning words, the diff, and the user 
tuning word, such as:
"11.141          2    1632    1632    1774  1140963061 1140662413 0 214"

Maybe you can use it as a starting point for your tests:
http://n5tnl.com/time/fe-5680a/control/fe5680_logger_4.c


I wonder if commands 0x57 and 0x59 might be the tempco lookup table. 
I've made a rough graph of the transfer function, but it's not good 
enough to compare. Really need a slow 0-2.5 VDC ramp generator.


-- 
newell  N5TNL 



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