[time-nuts] HP53131A RS232 question

Bob Camp kb8tq at n1k.org
Sat Dec 3 15:19:59 EST 2016


Hi

It’s quite a bit better than that if you speed up the i/o (higher baud rate etc)

Bob

> On Dec 3, 2016, at 3:05 PM, Scott Stobbe <scott.j.stobbe at gmail.com> wrote:
> 
> 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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