[time-nuts] PM6681 and Timelab (was: PM6680 or 53131A for TimePod)

[davidh]

Hi Angus,

I have three 6681s operating concurrently under a single instance of 
timelab beta. It operates perfectly, even live n-cornered measurements. 
Kudos to John!


The only downside (and I understand why it's this way) is that each 
counter needs a unique GPIB interface, but this is a timelab requirement 
and nothing to do with the counters.


My only fear regarding the counters is that I'll lose the cal one day, 
so I'm keen to discover how we can calibrate them ourselves.


Cheers,

david


On 17/11/2015 7:32 AM, Angus wrote:

Hi,

PM6681's turn up at quite a good price too, and you get a lot of
extras over the 6680 - does anyone know if Timelab will work with a
6681?

Angus.



On Sun, 15 Nov 2015 15:10:42 -0800, you wrote:





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Re: [time-nuts] PM6680 or 53131A for TimePod

[Magnus Danielson]

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  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  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  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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Re: [time-nuts] PM6681 and Timelab (was: PM6680 or 53131A for TimePod)

[Azelio Boriani]

Not necessarily, if you follow the service manual's procedure, you can
replace the backup 3V cell safely, keeping the calibration data: the
problem is checking periodically the backup cell or replacing it
regularly (say, every 5 years).

On Tue, Nov 17, 2015 at 12:33 PM, davidh  wrote:
>
>
> Hi Angus,
>
> I have three 6681s operating concurrently under a single instance of timelab
> beta. It operates perfectly, even live n-cornered measurements. Kudos to
> John!
>
> The only downside (and I understand why it's this way) is that each counter
> needs a unique GPIB interface, but this is a timelab requirement and nothing
> to do with the counters.
>
> My only fear regarding the counters is that I'll lose the cal one day, so
> I'm keen to discover how we can calibrate them ourselves.
>
> Cheers,
>
> david
>
>
> On 17/11/2015 7:32 AM, Angus wrote:
>>
>> Hi,
>>
>> PM6681's turn up at quite a good price too, and you get a lot of
>> extras over the 6680 - does anyone know if Timelab will work with a
>> 6681?
>>
>> Angus.
>>
>>
>>
>> On Sun, 15 Nov 2015 15:10:42 -0800, you wrote:
>>
>
>
>
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> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to
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Re: [time-nuts] PM6681 and Timelab (was: PM6680 or 53131A for TimePod)

[Azelio Boriani]

Not necessarily, if you follow the service manual's procedure, you can
replace the backup 3V cell safely, keeping the calibration data: the
problem is checking periodically the backup cell or replacing it
regularly (say, every 5 years).

On Tue, Nov 17, 2015 at 12:33 PM, davidh  wrote:
>
>
> Hi Angus,
>
> I have three 6681s operating concurrently under a single instance of timelab
> beta. It operates perfectly, even live n-cornered measurements. Kudos to
> John!
>
> The only downside (and I understand why it's this way) is that each counter
> needs a unique GPIB interface, but this is a timelab requirement and nothing
> to do with the counters.
>
> My only fear regarding the counters is that I'll lose the cal one day, so
> I'm keen to discover how we can calibrate them ourselves.
>
> Cheers,
>
> david
>
>
> On 17/11/2015 7:32 AM, Angus wrote:
>>
>> Hi,
>>
>> PM6681's turn up at quite a good price too, and you get a lot of
>> extras over the 6680 - does anyone know if Timelab will work with a
>> 6681?
>>
>> Angus.
>>
>>
>>
>> On Sun, 15 Nov 2015 15:10:42 -0800, you wrote:
>>
>
>
>
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> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
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