I was told by a Technical Support Engineer from Symmetricom Global Services
that
The typical life span is ~10 years for these Rubidium Time Bases.
This is in response to my request for information on a Ball/Efratom
PTB-100.
Is this a typical life span of a rubidium standard?
We had a guy
In message c23fcf4b010c4b02b74fb84b02195...@escaleno, Marco A. Ferra writes
:
We had a guy from Pendulum Instruments in our Laboratory that stated that
the life span of Rubidium crystals are between 10 ~ 12 years, so the
information seems to be correct. I believe that when the rubidium starts
At 03:24 PM 11/23/2009, Poul-Henning Kamp wrote...
There are no rubidium crystals involved.
Next you'll try and tell us that you can't make a clock run backwards
by using dilithium crystals, and making it warp time.
My understanding is that the Rb gets absorbed into the glass envelope,
so
Subject: Re: [time-nuts] Rubidium standard
At 03:24 PM 11/23/2009, Poul-Henning Kamp wrote...
There are no rubidium crystals involved.
Next you'll try and tell us that you can't make a clock run backwards
by using dilithium crystals, and making it warp time.
My understanding is that the Rb
Rubidium crystals?? Do tell!
-Chuck Harris
Marco A. Ferra wrote:
I was told by a Technical Support Engineer from Symmetricom Global
Services that
The typical life span is ~10 years for these Rubidium Time Bases.
This is in response to my request for information on a Ball/Efratom
PTB-100.
line :-))
Alan G3NYK
- Original Message -
From: Mike Smi...@flatsurface.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Monday, November 23, 2009 9:10 PM
Subject: Re: [time-nuts] Rubidium standard
At 03:24 PM 11/23/2009, Poul-Henning Kamp wrote
In message 4b0b0ed6.3080...@xtra.co.nz, Bruce Griffiths writes:
This lamp wear out mechanism is avoided if one uses laser interrogation
of the absorption cell.
About that...
Isn't that the sort of experiement we should try to lure Tom into doing ?
There must be a way to create a DIY
Poul-Henning Kamp wrote:
In message4b0b0ed6.3080...@xtra.co.nz, Bruce Griffiths writes:
This lamp wear out mechanism is avoided if one uses laser interrogation
of the absorption cell.
About that...
Isn't that the sort of experiement we should try to lure Tom into doing ?
There
Bruce Griffiths wrote:
Poul-Henning Kamp wrote:
In message4b0b0ed6.3080...@xtra.co.nz, Bruce Griffiths writes:
This lamp wear out mechanism is avoided if one uses laser interrogation
of the absorption cell.
About that...
Isn't that the sort of experiement we should try to lure Tom into
I might indeed believe the glass absorbs it. That might have been what I had
seen when trying to repair some of the lpro type rbs.
Thanks
On Mon, Nov 23, 2009 at 4:10 PM, Mike S mi...@flatsurface.com wrote:
At 03:24 PM 11/23/2009, Poul-Henning Kamp wrote...
There are no rubidium crystals
2009/11/19 Mike S mi...@flatsurface.com:
At 05:22 AM 11/18/2009, Steve Rooke wrote...
The point I should have made is that most quoted MTBF figures have a
reasonable bearing on the lifetime of the item,
But your point would then be almost perfectly incorrect. MTBFs are not meant
to, nor do
Hi
Just to put some numbers on this stuff:
A typical TV has a design goal of a 5 year lifetime. A premium TV has a
design goal of a 10 year lifetime. The theory is that if it doesn't last that
long, the customer will not buy another one from your brand.
Here in the US, most cell phones get
On 11/19/09 4:56 AM, Bob Camp li...@cq.nu wrote:
Hi
The one that I find the most shocking is the very major internet hardware
company that considers 5 years of continuos use to be the goal. The logic - we
want them to swap out the gear regularly
That's actually reasonable.. Moore's
temperatures that are
considerably higher than room temperature.
- Original Message
From: Bob Camp li...@cq.nu
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thu, November 19, 2009 4:56:27 AM
Subject: Re: [time-nuts] Rubidium standard / MTBF
Hi
Just
Hi
One of the reasons we use 10 to 20 year old designs in the space products is
that we know they'll work for 10 to 20 years
Bob
On Nov 19, 2009, at 10:17 AM, Lux, Jim (337C) wrote:
On 11/19/09 4:56 AM, Bob Camp li...@cq.nu wrote:
Hi
The one that I find the most shocking is
and frequency measurement time-nuts@febo.com
Sent: Thu, November 19, 2009 4:56:27 AM
Subject: Re: [time-nuts] Rubidium standard / MTBF
Hi
Just to put some numbers on this stuff:
A typical TV has a design goal of a 5 year lifetime. A premium TV has a
design goal of a 10 year lifetime
2009/11/13 Mike S mi...@flatsurface.com:
I'm sure someone with more statistics background can add to this, but useful
(or expected) lifetime cannot be determined from an MTBF number.
Here's an example I found, demonstrating this:
There are 500,000 25-year-old humans in the sample population.
The failure rate of a human is not constant over the lifetime and just
taking a figure at the age of 25 will get you nowhere.
Steve, I think you'll find that's a total red herring.
That's because if you measure failure rates of almost anything, you will
find that the failure rate varies over
Dave,
The point I should have made is that most quoted MTBF figures have a
reasonable bearing on the lifetime of the item, this example was well
off given the inbuilt expiry dates of humans. In addition, a lot of us
are using equipment that is well past it's use by date and it keeps on
going,
At 05:22 AM 11/18/2009, Steve Rooke wrote...
The point I should have made is that most quoted MTBF figures have a
reasonable bearing on the lifetime of the item,
But your point would then be almost perfectly incorrect. MTBFs are not
meant to, nor do they, predict product lifetimes. They are
Steve Rooke escribió:
The MTBF is the inverse of failure rate or 1 / 0.00125 = 800 years.
The meaning is that if you a representative sample of 25 year-old
humans, and their ages remains at 25 years constantly during 800 years,
you should expect that half of the humans would have failed ater
Message -
From: Mike S mi...@flatsurface.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Wednesday, November 18, 2009 12:54 PM
Subject: Re: [time-nuts] Rubidium standard
At 05:22 AM 11/18/2009, Steve Rooke wrote...
The point I should have made
If it weren't so horribly true I would be ROTFLMAO!
Dave
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Alan Melia
Sent: 18 November 2009 14:27
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Rubidium
EM79xx
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Alan Melia
Sent: Wednesday, November 18, 2009 9:27 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Rubidium standard
The big problem with MTBF
It used to be, that if you knew the right people at IBM, you could
get a printout of the actually in-field observed MTBF of all their
components.
That database is why they managed to respond to the infamous
legionnaires disease in one of their DASD units, where pretty
much all shipped drives
- Original Message -
From: David Smith w...@msn.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Thursday, November 12, 2009 2:31 AM
Subject: Re: [time-nuts] Rubidium standard
I'm new to the list. Having said that, I ran across a webpage from
Yes, that's the page .
Thanks, Dave
- Original Message -
From: philmailto:fort...@bellsouth.net
To: Discussion of precise time and frequency
measurementmailto:time-nuts@febo.com
Sent: Thursday, November 12, 2009 12:27 AM
Subject: Re: [time-nuts] Rubidium standard
At 03:31 AM 11/12/2009, David Smith wrote...
The LPRO-101 blurb says:
Amb.Temp: 20 °C 25 °C 30 °C 40 °C 50 °C 60 °C
MTBF (hrs) 381k 351k 320k 253k 189k 134k
A year is 8760 hours (ignoring leap
years). Call that 10K. So they
expect
25 years at 40C and 32 years at
Glenn,
I believe thats the case.
I have a number of the small x cel tower rbs.
You can nurse them a bit.
But the failures I have run into are other things.
Like the tuning cap on the lamp exciter getting noisy
Also I have found re-peaking the multiplier chain can help
It definitely stretches
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Thursday, November 12, 2009 3:33 PM
Subject: Re: [time-nuts] Rubidium standard
Glenn,
I believe thats the case.
I have a number of the small x cel tower rbs.
You can nurse them a bit.
But the failures I have run
I've been a Time Nut for a couple of years. During that time I've
repaired a couple of dead Efratom FRK Rubidium standards. Both were 20+
years old. One had a dead transistor and the crystal oscillator in the
other had drifted so far that it couldn't lock. Both problems were easy
to fix.
Glenn,
The lamp is usually the limiting factor.
The PRS10 advertises its lamp life to be 20 years.
HP bulbs last a bit longer.
Tracor bulbs fail with a different mechanism and last maybe 10 years.
Efratom bulbs last at least 10 to 15 years.
The rejuvenation you referred to is for lamps that
I was told by a Technical Support Engineer from Symmetricom Global
Services that
The typical life span is ~10 years for these Rubidium Time Bases.
This is in response to my request for information on a Ball/Efratom PTB-100.
Is this a typical life span of a rubidium standard?
Do some standards
I was told by a Technical Support Engineer from Symmetricom Global
Services that The typical life span is ~10 years for these Rubidium
Time Bases.
This is in response to my request for information on a Ball/Efratom
PTB-100.
Is this a typical life span of a rubidium standard?
It's lower
-nuts] Rubidium standard
I was told by a Technical Support Engineer from Symmetricom Global
Services that The typical life span is ~10 years for these Rubidium
Time Bases.
This is in response to my request for information on a Ball/Efratom
PTB-100.
Is this a typical life span
of
this group on the FEI unit I bought from e-bay.
Regards
Geoff
- Original Message -
From: Christopher Hoover [EMAIL PROTECTED]
To: time-nuts@febo.com
Sent: Tuesday, August 16, 2005 9:59 AM
Subject: [time-nuts] rubidium standard caveats?
hi folks.
i intend to buy a used rubidium standard
A FRK-L or M100, or LPro are good units. Make sure the buyer throws in
the I/O connector and a manual. I beleive the best is the SRS PRS10, it
cost more, but it has great specs and it has a built in disciplining
circuit - if it hooked up to a 1 PPS from a timing GPS receiver.
Certain
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