[time-nuts] HP53131A RS232 question

Bob Camp kb8tq at n1k.org
Sat Dec 3 19:42:57 UTC 2016


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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