[time-nuts] Another query on the 5065A
Palfreyman, Jim L
Jim.Palfreyman at team.telstra.com
Thu May 15 02:03:49 UTC 2008
Having got the previous issues ironed out I set about calibrating the 5065A. This all went well and I got the drift down so I couldn't see it move over a few hours.
The next step is to see how it performs over a longer time base.
So I come back a day or two later and find it is 50ns out. So I plugged the 1PPS from my reference into the back and pressed the "synchronise" button and it is still 50ns out.
So I adjusted the sub-microsecond trimmer to bring it back in line. Next day it is out again. Re-synchronising made no difference.
Am I right to assume there might be a problem in the delay circuit? Anyone seen this before?
(I haven't looked at the book yet - am just about to...)
Regards,
Jim Palfreyman
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