Thanks for the pointer on the C-field. Yes, it aligns with the small
hole in the case. A lucky 1/4 counter clockwise turn reversed the drift
from 450 nsec per hour to 200 nsec in 10 hours. That accuracy begins to
rival the GPS signal over the range. I plan to leave it alone for a
couple of
After several weeks of slow evening and hour here and hour there the FEI
5680a is performing on the bench. I was able to get the serial interface
to operate for a brief period. The 'S' and 'F' commands worked long
enough to change the divisor to produce close to a 10 MHx output, it was
7 Hz
I spent quite a bit of time poking and prodding FE5680's.A while back, I
posted a piece about what I found. It covers some important details about
programming these units. The part about setting the frequency is at the end of
the piece. Dieder has it available on his site:
Mark,
Thank you for your work and your reply, I was able to disconnect the
output of the DDS board from the 1 second divider, the DDS board
produces a clean sine wave.
I thank you for your article, I have a couple of follow up questions:
1. Which pot is the C-field?
2. Did you ever
Hello Dan,
I think the C-field pot is the one accessible through the hole in the outer
cover. If you don't have the cover, it is on one side of the physics package
can near the top, center.
I never messed with the reset pin. The RS-232 interface works just fine.
Most of my units are the
