On 3/17/2013 4:54 PM, Volker Esper wrote:
The HP seems to be the more modern design. As I guess, the analog
circuits are to blame, maybe HP was able to make use of newer technologies.
FWIW, the 53132A design goes back 20 years
Rick
___
time-nuts m
Hi Volcker, Bob,
I guess it depends on what one needs. The SR-620 is probably more of a gizmo to
play with when one likes to manually adjust things or needs the better time
interval resolution.
The HP unit is more of a fire-and-forget unit.
Me having the benefit to be able to chose, I would ge
Hi
This brings up the basic "how bad is it" question. Since the counter is
fundamentally a 200 ps gizmo, a simple period measurement at 1 second will give
you ~ 10 digits per second. That's with no magic multiple sample stuff at all.
At an offset / noise / what ever state where the multiple sa
Bob,
Thats why the 53132A counter reduces the resolution to one digit less at that
frequency, and why we use an external divide by 2 for 10MHz measurements to
regain that digit.
I wanted to be fair and compare apples to apples. If i use our 5Mhz input, the
53132A will be even better.
We are a
Hi
Be very careful of what the 53132(1) reports with the ref out connected to the
input. You are guaranteed to be in the "dead zone" on the counter when you do
that.
Bob
On Mar 17, 2013, at 5:33 PM, saidj...@aol.com wrote:
> Hi Volker,
>
> there are some issues here, first the worst case f
On 03/17/2013 08:05 PM, saidj...@aol.com wrote:
Ed,
the calculation is the same, however the numbers are 100ps for 53132A
versus 350ps, and I have not seen an average systemic offset being displayed on
any of the 3x 53132A units I use, and I see one on the SR-620. That's why
I sent it into SRS
Hi Volker,
there are some issues here, first the worst case frequency systematic
uncertainty is 100ps for the 53132A, not 350ps as on the SRS unit or 500ps as
you stated. So they are not the same, they are 3.5x different.
>From the Agilent manual:
Systematic Uncertainty:
Agilent 53131A A
Hi,
I just powered on my SR and looked for the offset, when the 10 MHz
reference is connected to the input (at a gate time of 1s without
further averaging). It shows an offset of 0 to 400uHz which should
represent a mean error of 2E-11, while the manual predicts an error of
about 1E-10 (as S
On 3/17/2013 1:56 PM, Ed Palmer wrote:
On 3/17/2013 10:41 AM, Said Jackson wrote:
The "acceptable" specs are pretty crappy in tim-nuts terms: +/-350pico
* frequency with a 1s gate time. Thats straight from the user manual
and assuming no reference error. From the manual:
Frequency Accuracy:
< ±
Ed,
the calculation is the same, however the numbers are 100ps for 53132A
versus 350ps, and I have not seen an average systemic offset being displayed on
any of the 3x 53132A units I use, and I see one on the SR-620. That's why
I sent it into SRS for calibration, paid the $$$ and got it ba
Hi Said,
That equation looks similar in form to the specs for any counter. What
are the comparable equations for the 53132A or the 5370(A or B)?
Ed
On 3/17/2013 10:41 AM, Said Jackson wrote:
Volker,
The error I have seen was in the high xE-011's to the low xE-010's. the only
way around it
Volker,
The error I have seen was in the high xE-011's to the low xE-010's. the only
way around it was to turn on relative measurements, which then subtracted out
this error. That error makes the unit almost useless to me.
The factory told me as long as it is within specs they will ship it afte
Hi Bob,
On 03/17/2013 02:08 PM, Bob Camp wrote:
Hi
If the gate time is fairly long, the "notch" in the resolution is quite narrow.
As expected. The gate-time controls the width of this notch.
You don't have to be very far off of 10 MHz to go back to fairly high
resolution. Again, not a kno
Hi
If the gate time is fairly long, the "notch" in the resolution is quite narrow.
You don't have to be very far off of 10 MHz to go back to fairly high
resolution. Again, not a knock on this fine counter, just something to watch
out for.
Bob
On Mar 17, 2013, at 7:45 AM, Magnus Danielson
w
On 03/17/2013 01:43 AM, Bob Camp wrote:
Hi
The 53132 is indeed a fine counter. It's got another flaw though - right at 10
MHz the resolution takes a dive. If you are doing time nut stuff, that may be a
significant issue.
The frequency averaging method can make use of the beating of the
refe
Hi
The 53132 is indeed a fine counter. It's got another flaw though - right at 10
MHz the resolution takes a dive. If you are doing time nut stuff, that may be a
significant issue.
Bob
On Mar 16, 2013, at 8:32 PM, Brooke Clarke wrote:
> Hi Volker:
>
> The HP HP53132A can measure frequency a
Hi Volker:
The HP HP53132A can measure frequency at the rate of 12 digits per second, that's way better than ordinary counters, but
when measuring time interval it's the same as any other counter.
The big disadvantage of the HP53132A in my opinion is it's user hostile menu
system.
http://www.p
Hi
The whole "how to align the SR-620's" thing has been gone over in great length
(and very precisely) on the list. The bottom line is that Stanford's alignment
procedure is not quite as good as it should / could be.
Oddly enough, I don't remember seeing the residual offset in any brand new
S
What "small error" are we speaking about? The statement that SRS users
have to tolerates a small error while HP users don't seems a little to
general to me. IMHO we might be a bit more precise. Anyone who's already
done an error analysis for - say - a 10MHz count and a comparison of the
count
>>1) I paid quite a bit of money and I had it "calibrated" and fixed by
>> SRS,
>>and it still exhibits a significant frequency offset with a "perfect"
>>reference and "perfect" DUT!!!
>
>>SRS says a small frequency error is "normal", well that prevents me from
>>using the unit as a frequency coun
I am very glad to see so many replies in the morning, and I am very
>>grateful to every time nuts gave me useful information, your proposal has
>>strengthened my determination, in fact, I am also very like SR625, So I will
>>to
>>find and buy a good shape SR625 for m
Hi
Normally a 625 is priced above a 620. Rubidium standards have a finite life.
You are paying for the Rb when you buy a 625. If the Rb is worn out or nearly
at end of life, the 625 is not a good idea.
Bob
On Feb 7, 2013, at 7:22 PM, Hui Zhang wrote:
> Hello Dear Group:
>
>
>I am very
Hui,
rent one of each if you can before you make your choice. I have both, and
the HP unit is much easier to use once you know which button sequence to
push to get more than just "Frequency/Time-Interval" type measurements - these
can be single-button events on the HP unit.
Even offsettin
Hello Dear Group:
I am very glad to see so many replies in the morning, and I am very
grateful to every time nuts gave me useful information, your proposal has
strengthened my determination, in fact, I am also very like SR625, So I will to
find and buy a good shape SR625 for my new time in
cant plus.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Hui Zhang
Sent: Thursday, February 07, 2013 9:43 AM
To: time-nuts@febo.com
Subject: [time-nuts] HP53132A vs SR625
Dear Group:
I am intend to buy a second-hand counter, I have not deci
Hi Hui:
The HP 53132A is called a "Universal Frequency Counter" can count frequency at 12 digits per second, but that is not the
case when it is measuring time intervals. The human interface might be called user hostile.
The front panel of the SR 620 is marked "Universal Time Interval Counter
and you don't have a house standard, then that's a significant plus.
>>>
>>> Bob
>>>
>>> -Original Message-
>>> From: time-nuts-boun...@febo.com
>>> [mailto:time-nuts-bounces@**febo.com]
>>> On
>>> Behalf Of Hui
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Hui Zhang
Sent: Thursday, February 07, 2013 9:43 AM
To: time-nuts@febo.com
Subject: [time-nuts] HP53132A vs SR625
Dear Group:
I am intend to buy a second-hand counter, I have not decided yet
between
SR6
rd, then that's a significant plus.
>
> Bob
>
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
> Behalf Of Hui Zhang
> Sent: Thursday, February 07, 2013 9:43 AM
> To: time-nuts@febo.com
> Subject: [time-nuts] HP5313
: Thursday, February 07, 2013 9:43 AM
To: time-nuts@febo.com
Subject: [time-nuts] HP53132A vs SR625
Dear Group:
I am intend to buy a second-hand counter, I have not decided yet between
SR625 and HP53132A, they have very close price in surplus market of here,
so, which is better choice? Any suggesti
Dear Group:
I am intend to buy a second-hand counter, I have not decided yet between
SR625 and HP53132A, they have very close price in surplus market of here, so,
which is better choice? Any suggestion will be appreciated.
Best Regards!
Hui Zhang
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