[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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