OK seems no matter what I do compared to the Tbolt and Z3801the 5061/5060
still drifts right on the scope. Granted a big shift in the cfield seems to
get the unit to advance, but then after some hours it returns back to the
same slow rate. But I did learn about the magical A1 synthesizer and built
Corby
Having a good time tinkering with the 5061. Did change the resistors for
the cfield regulator so that its much close to the schematic and am
experimenting with that.
The system does seems to be able to be tuned through a stable position that
reduces the drift to 2 min/10ns drift and the CS
Paul,
First off, is it a 5060A or 5061A?
More C-field current increases frequency.
You can check the synthesizer frequency, It should be 12.6317716 or
12.6317725 Mhz.
Either one is OK as you select the A15 resistor to center the C-field pot
anyway.
Here is info from an earlier post.
The
Hi Paul,
About cesium clocks: hp 5060A and early versions of the hp 5061A needed to be
able to keep *either* atomic time (true, accurate, stable, SI seconds) or
astronomical time (inaccurate, unstable, slow, and gradually slowing, earth
rotation time).
The larger C-field range allowed this
Corby it is a 5061a with a 5060 tube in it that has a few Cs leftover.
(Original 004 tube was seriously empty)
Had to create a new oven controller to get to those Cs its temperature is
slightly elevated over what the 5061a could do. I can just see beam current
at maybe .25 of a tick mark above
Tom and Corby
Thanks for the help. I suspect that the 5060/5061 is perhaps as good as it
can get.
My other references such as the 3801 and Tbolt have it down now in the
1X10-11 region. Close to 1 but goes above and below. I did find the magical
cfield R to be 70 ohms and will have to calculate the
Paul the C-field current is the same for the 5061A and 5060A.
The 5060A C-field pot has LOTS more range than the later 5061A where they
installed resistors on each side of the pot to reduce the range.
Corby
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Corby
I pulled the a15 board and there are no resistors, just a short across what
would have been r19 and 21. So I suspect that there is to much current
actually. Further speculation is that when the pot is toward ground more
current flows from what I see in the schematic.
I may guess that more
