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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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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