[time-nuts] [Bulk] Re: Another query on the 5065A
Dave "Squeezebox" Carlson
dgcarlson at sbcglobal.net
Sat May 17 22:04:48 EDT 2008
Correct. Meant to sync the 1PPS.
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of WB6BNQ
Sent: Wednesday, May 14, 2008 7:25 PM
To: Discussion of precise time and frequency measurement
Subject: [Bulk] Re: [time-nuts] Another query on the 5065A
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.
"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...)
> Jim Palfreyman
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