> Or, perhaps not. The two working TSD12s that I see on eBay (apparently
> the same as the PRS-10 except the lock flag is set to 3 instead of 1 and
> which can be reset)
Would you elaborate on this? I Googled for TSD12 and except for the
auction listings, found nothing.
Joe Gray
It may be that the need for that kind of resolution died out.
The next step up from quartz thermometry is resistance thermometry.
The linearization equation for platinum has enough terms to make it
uncertain around .01 C.
Temperature calibration baths usually use platinum resistance sensors.
It m
> Hi
> Anything electrical (duty cycle/ harmonics / output level / etc)
> is designed in on a modern part done in high volume.
> The only candidates for a pot on top of the oven are:
> Inner oven temperature
> Outer oven temperature
> EFC
> You have already ruled out EFC (it would be a coarse
Hi,
I hope this is still relevant and not too off-topic...but since it involves
crystals and tempco...
Quartz thermometers (e.g. the HP 2804A) with their 'linear cut' crystals and
'0.0001C resolution' seem to have been a thing from the mid-60's to the
mid-80's:
http://www.hparchive.com/Journa
Bob,
After all of the excellent feedback here, my current thinking is that I can
get a parts / repair PRS-10 for somewhere near $150. There are several reasons
that this might be the best option...
1. It appears to be about the best that I can afford from what I have seen
of the testing
Pete,
I will be using it for a general lab standard, to feed into other test
equipment. But, I can't predict my future usage, so I want the best that I can
get. I also plan on eventually locking it to a GPS (probably a U-Blox board).
I am retired, so my budget is nearly non-existent. :-) I have t
HI
None of this is a simple slam dunk.
The 5065 has great ADEV numbers. In “as delivered” condition It has horrid TC
and pressure sensitivity. It also is > 10X more expensive than a lot of the
other devices.
The units that *can* be disciplined are rarely set up to do so properly off of
a GPS
Why don't you look at the outline to determine what might be needed or
missing .
Ulrich
In a message dated 3/11/2016 11:09:51 A.M. Eastern Standard Time,
att...@kinali.ch writes:
Hoi Ulrich,
On Mon, 7 Mar 2016 19:52:58 -0500
KA2WEU--- via time-nuts wrote:
> I have published th
Mark's Law of Rubidium Goodness... the bigger the box, the better it is. The
HP5065A is one of the best units ever made. It can rival a cesium beam unit.
The X72 is a horrid little creature.
I would also go with the M100 / FRK units. The LPRO an FE56xx units were
designed for telecom use
Dear Luciano
I run a T&F calibration laboratory.
It sounds like what you're after is a Test Method (TM), which we use as
part of our quality system. Any accredited calibration laboratory will have
documents like this. They vary greatly in their detail according to the
needs of each laboratory, an
In message , cdel...@juno.com writes:
>Luciano is correct. The HP 5065A beats all the others easily.
There's one for sale on ebay.fr these days.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer | BSD since
Corby mentioned one very important thing .. what are you going to be using
it for ?
and I'll ask what is your budget ?
That will determine quite a bit.
-pete
On Fri, Mar 11, 2016 at 11:02 AM, wrote:
> Mike,
>
> Luciano is correct. The HP 5065A beats all the others easily.
>
> It is not config
I have been running an M100 for over 15 years. It was NOS when I purchased it
for $300. Runs 24x7, and just keeps chugging along.
Rob
NC0B
Sent from my iPad
> On Mar 11, 2016, at 10:01 AM, "time...@metachaos.net"
> wrote:
>
>
>
> Luciano,
>
> Why? Why the Efratom FRK or M100 over the Efr
Mike,
Luciano is correct. The HP 5065A beats all the others easily.
It is not configured however to be disciplined although it can be
modified.
It's main claim to fame is the excellent short term stability.
If all you are after is a long term accuracy standard then any of the
others would work
Hello,
Recently I acquired Symmetricom / Microsemi pcie-1000 PTP Clock Card
Here is the link to that product:
http://www.microsemi.com/document-portal/doc_view/133454-syncpoint-pcie-1000-user-s-guide
The Installation Instructions mention the Linux driver for it, which
covered by GNU licemse
Luciano,
Why? Why the Efratom FRK or M100 over the Efratom LPRO-101? The M100 appears
to be manufactured in '91. Given the limited lifespan, why such an older
choice? I didn't list the HP5065A because I didn't see it on eBay. What makes
it better than the others? Why not one of the Symnmetricom ve
I'd never heard of the SRS TSD-12 until I saw it on your list. It looks
like a SRS PRS-10 with the connector in a different location but I don't
know if they are close in performance or not.
you might want to take a look at the PRS-10 anyhow since it appears to have
excellent performance numbers;
As to calibration interval, you should look for example at page 3-2 of HP
Manual 10811-90002, where they give general principles and then specific
examples to find the "minimum calibration interval".
This manual online at http://www.leapsecond.com/museum/10811a/10811a.pdf
They also give several p
Hi
At least in my experience, such documents do not exist. What happens:
1) The unit is put on a calibration schedule (1 year) on an arbitrary basis
2) The tech is expected to read the manual for the device and calibrate it
3) Any deviation from cal is noted in generic documents
Put another way
Hi Mike,
You have not mentioned the best Rubidium available, the HP5065A. Last week two
of them are sold on ebay.
Second chose can be the Efratom FRK or M100, than all the others.
Luciano
On Fri 11/03/16 12:02 , time...@metachaos.net wrote:
> Hi,
>
> In looking at eBay, I current see quite
Hi,
In looking at eBay, I current see quite a few different types of rubidium
frequency standards. I have seen some of these mentioned here, but no real
comparisions. The question, is what are the pros and cons of these specific
models? Which ones are best or most reliable? Which ones cannot be di
Hi all,
Among the many experts and documentation available on the internet my question
might seem trivial .
I'm looking for a written document , not generic information, describing the
procedure , timing and methods of calibration of one or more standard present
in a laboratory frequency stan
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