[time-nuts] PM6680 or 53131A for TimePod

Magnus Danielson magnus at rubidium.dyndns.org
Tue Nov 17 06:51:34 UTC 2015


Bob,

The single-shot does not improve, it's 500 ps, but the averaging of N 
samples give you that result. The 53131 does similar tricks.

Cheers,
Magnus

On 11/17/2015 02:27 AM, Bob Camp wrote:
> Hi
>
> At leas on the spec sheet I found, both counters have a single shot of 500 ps. The
> 6680 “improves” as the averaging goes up.
>
> http://isurplus.com.au/specifications/Philips%20PM6680%20Specifications.pdf
>
> Section 13-8 has a lot of “500 ps / sqrt(N)" in it. If N=1 (single shot) you get 500 ps. HP stops the
> process when resolution and random bounce are roughly equal. Fluke gives you another bit of
> noise to possibly average out under some conditions.
>
> At least the way I read the data sheets, the two counters are very similar.
>
> Bob
>
>> On Nov 15, 2015, at 6:10 PM, Scott McGrath <scmcgrath at gmail.com> wrote:
>>
>> Thanks Bob
>>
>> I'm using the actual time pod for paying activities.  This would be a counter for time nuttery using the time pod software.  In those cases Where I don't want to fire up the 5071.
>>
>> I'm familiar with the Keysight counters and I have a lot of them into the high Ghz ranges
>>
>> The 53131 is spec'd to 500ps and the  6680 is spec'd at 250ps
>>
>> I've also been leaning in the 53131 direction but I'd like to have the best tool for the job at hand
>>
>> Content by Scott
>> Typos by Siri
>>
>>> On Nov 15, 2015, at 1:59 PM, Bob Camp <kb8tq at n1k.org> wrote:
>>>
>>> Hi
>>>
>>> I guess the first question would be - If you have a Time Pod, what do you need a counter for?
>>>
>>> Based on a guess that you need extended frequency range, either would do pretty well. My vote
>>> would go to the HP for a couple of reasons:
>>>
>>> 1) It’s more broadly supported in terms of driver software (which may or may not matter to you).
>>>
>>> 2) It’s a more common item on the auction sites, so parts are easier to find.
>>>
>>> 3) It shares some parts (like the power supply) with the (cheaper) 53181
>>>
>>> No those are not great big reasons to go for one over the other. They are very similar devices. One
>>> has an LCD that has a finite life. The other has a VFD that also has a finite life. Both are custom, that’s
>>> a tie. Some like the command (button) arrangement on one over the other. I think it’s more a “what
>>> are you used to” thing than anything else. On the 53131 you need to hit the Run button in some cases.
>>>
>>> I have not watched the prices on the Fluke. I have kept track of the 53131’s. A “good price” on one
>>> these days is below $600 ( = you may need to shop a bit, but they do show up).
>>>
>>> Bob
>>>
>>>> On Nov 15, 2015, at 1:45 PM, Scott McGrath <scmcgrath at gmail.com> wrote:
>>>>
>>>> Hi
>>>>
>>>> Which counter would be best for use with time pod I have a chance to buy each at a reasonable prices i.e. < 1000 US
>>>>
>>>> Thanks in advance Scott
>>>>
>>>> Content by Scott
>>>> Typos by Siri
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