[time-nuts] Another query on the 5065A

WB6BNQ wb6bnq at cox.net
Wed May 14 22:25:19 EDT 2008


Hi Jim,

I would have to look in the manual to be 100%, but for 90%, I think the "synchronize" button is just to synchronize the 1pps pulse with an external 1pps reference.  It is a clock
(i.e., time) function NOT a frequency function.

Bill....WB6BNQ


"Palfreyman, Jim L" wrote:

> 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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