[time-nuts] HP53131A RS232 question

[Scott Stobbe]

The 53131A is approximately 0.9 Sa/S with a 1 Sec Gate time. With 0.1 s
gate time things get really ugly... His issue is not gate time his setup
works with print turned off.

On Sat, Dec 3, 2016 at 2:42 PM, Bob Camp <kb8tq at n1k.org> wrote:

> Hi
>
> Ok, it’s 0.99999992 samples per second … I guess that is so close to
> 5.0000000000000 seconds and so far from 1.000000000000 seconds that it
> explains the issue
>
> Bob
>
> > On Dec 3, 2016, at 2:01 PM, Scott Stobbe <scott.j.stobbe at gmail.com>
> wrote:
> >
> > Well, that's only true if your counter has zero dead-time... I know you
> > know this, 1 second gate time will give slightly less than 1 Sa/S.
> >
> > On Fri, Dec 2, 2016 at 1:15 PM, Bob Camp <kb8tq at n1k.org> wrote:
> >
> >> Hi
> >>
> >> With a 1 second gate time, you will get one data output per second with
> the
> >> settings you have described. I suspect there is something else wrong
> with
> >> your
> >> setup. The same settings will work for 1 pps and give you one reading
> >> output
> >> per second.  The input level should have no impact as long as it will
> >> properly
> >> trigger the counter.
> >>
> >> Bob
> >>
> >>> On Dec 2, 2016, at 12:54 PM, <cdelect at juno.com> <cdelect at juno.com>
> >> wrote:
> >>>
> >>> Hi,
> >>>
> >>> I have not played with my 53131A RS232 for a couple years and have a
> >>> question.
> >>> I want to configure it to "talk" to Hyperterminal so I can log some
> >>> readings.
> >>> I did the 5 items to configure it:
> >>> HW pacing (disabled)
> >>> print on
> >>> baud rate (19200)
> >>> parity
> >>> SW pacing (none)
> >>>
> >>> with a 5Mhz input I only get data sent about once every 3 seconds, I
> >>> thought with  a 1 second gate I'd get an  output measurement every
> >>> second?
> >>>
> >>> I would think there is plenty of time to output the first measurement
> >>> before the next one is read!
> >>>
> >>> Actual setup I'm wanting to do is time interval (at a 1PPS rate) and
> log
> >>> the results.
> >>>
> >>> I remember I had it working once and it would be OK as long as I did
> not
> >>> exceed around 80% of full scale.
> >>> If that happened I would only get an output logged every other second.
> >>>
> >>> I can live with that part but need to get back to it working below
> around
> >>> 80%.
> >>>
> >>> Any advice is most welcome!
> >>>
> >>> I'm going to configure for the TI and <80% and see what happens.
> >>>
> >>> Cheers,
> >>>
> >>> Corby
> >>>
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