Embarrassed, and I'll admit being both ignorant and pompous. Metal is used
in the ampoules. Won't go into any other details than that. Sorry Corby.
Dave Carlson
- Original Message -
From: "Corby Dawson"
To:
Sent: Thursday, September 10, 2009 11:42
Subject: [ti
cede that at some time in the past HP may have switched their
process from a metal to a glass ampoule, and you should know if you indeed
pulled that oven from an older HP CBT. But don't say that HP doesn't used
glass. That's absolutely wrong. They did when they were HP, and co
Chuck,
Sorry to hear you're closing down, after all these years. Drop me a line
some time and we can talk.
Dave Carlson
(formerly HP, then Agilent)
- Original Message -
From:
To:
Sent: Tuesday, September 08, 2009 19:38
Subject: [time-nuts] HP 5061 chassis parts
As some o
Corby,
"The HP tubes used a heated metal "burst" diaphragm not glass ampoules to"
Actually, no. Glass ampoule inside the oven, surrounded by the wicking
material. Last step in the process of starting up a new tube is to use a
metal pin fired into the glass ampoule, similar to firing a small car
Trouble with the rch is that we're never sure if the "r" term is in the
real, or imaginary plane.
Dave
- Original Message -
From: "Lux, Jim (337C)"
To: "Discussion of precise time and frequency measurement"
Sent: Wednesday, August 19, 2009 10:07
Subject: Re: [time-nuts] Accurate 1 pp
Not to charge in, but I've looked at ordinary window pane glass in very old
buildings and you can actually see the rippling effect that occurred over
time, showing the "flow" of the glass toward the lower edge of the pane. One
presumes that the panes were relatively uniform when installed 120 ye
Since it's in a liquid, it must be in the hydroxide or some other
ionic-compound form.
Who can say as to any nutritional benefits? Anyone know whether the mild
radioactive decay carries over to these compounds?
Dave
- Original Message -
From: "Magnus Danielson"
To: "Discussion of pre
Um, John. Cesium is a Haz Mat. Are you prepared for all the export
paperwork to do the shipment?
Dave
- Original Message -
From: "John Miles"
To: "Discussion of precise time and frequency measurement"
Sent: Monday, March 23, 2009 12:53 PM
Subject: Re: [time-nuts] 5062C
> John,
>
David,
> I had a similar concern about a brand new 5071a I just purchased,This unit
is dated may of 05 and was first powered up Jan 2 of this year..
If it's really been turned off all that time, I'm surprised that it was able
to power up. Was the Ion Pump current much higher for some period of t
Hello,
Speaking not from a physicist perspective, but from being in the business
for over 20 years...
The mechanism depends somewhat on the amount of flux that has been traveling
through the CBT, which determines if the cesium becomes exhausted before the
electron multiplier first dynoe "wears
You might try Frequency Standards and Services in Colorado Springs for any
parts. However installing the 5061A/B A11 Dc Oven Controller into a 5060A
may not be simple.
Dave
- Original Message -
From: "corby d dawson" <[EMAIL PROTECTED]>
To:
Sent: Tuesday, January 08, 2008 8:48 AM
Subj
Hello,
Since the source of the noise is the vibration of the Hot Wire Ionizer
ribbon inside the CBT it will require using something other than pressure on
the outer container to snuff it out. The outer steel of the CBT is rigid.
Dave
- Original Message -
From: "Bruce Griffiths" <[EMAI
Hello,
With reference the 2k noise, this indeed was coming from the circuitry in
the A20 Oven Controller. We also had this in early 5061A from the original
A11 Oven Controller. Actually this is the Hot Wire Ionizer ribbon inside the
CBT being vibrated by the ac current flowing through it. It wa
Hello,
If you're referring to pumping down the CBT you should ensure that the +3500
Vdc HV supply is working properly and then put the 5061 in standby mode
(non-operate). This allows the HV supplies to operate but not the Cs oven.
It may take a few days before the Ion Pump current drops down to
ge out
anything. (Except maybe a marriage license!)
Raimond
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Dave Carlson
Subject: Re: [time-nuts] 5071 Firmware info
Raimond,
None of the FW upgrades have any effect on the stability or accuracy of the
5071
has a set of the
latest ROMS included as an encouragement to upgrade at that time.
The most recent FW change was simply to remove "Agilent" and insert
"Symmetricom" into the ID string. Certainly no reason to interrupt a
working primary standard just for the upgrade.
Dave Carlso
Jack,
See the thread below on this CBT, if it's indeed the same one.
Dave
- Original Message -
From: "Dave Carlson" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: September 08, 2005 1:44 PM
Subject: Re: [time-nuts] C
went out of support (~July 2005) so it was already
not in active production at the time of the acquisition.
That means that Symmetricom did not kill the 105B, it was already obsoleted
when acquired.
Just setting the record straight.
Dave Carlson
- Original Message -
From: "David
please
remember that this is the yyww of the last significant engineering change to
the model number.
The 1924A prefix remained unchanged until the 3232A prefix (smaller-diameter
CBT), over 13 years later, so not a good indicator of age, at all.
Dave Carlson
- Original Message -
From
Yes, 05061-6077 is the Standard Performance CBT. can anyone read any part of
the serial number? It might help to narrow down the age. The last 5 digits
are actually more important than the first 4 before the "A".
Dave
- Original Message -
From: "Magnus Danielson" <[EMAIL PROTECTED]>
To:
If you are looking at an old HP 5065A it may well be a very noisy reference
by now.
Dave
- Original Message -
From: "Christopher Hoover" <[EMAIL PROTECTED]>
To:
Sent: August 15, 2005 6:59 PM
Subject: [time-nuts] rubidium standard caveats?
hi folks.
i intend to buy a used rubidium sta
haps some
archaic suffix that was or is used to denote exact midnight, just as "m" is
used to denote exact noon?
Dave Carlson
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ndard, but not the 5071a.
Dave Carlson
Message -
From: "Magnus Danielson" <[EMAIL PROTECTED]>
To:
Sent: June 25, 2005 1:11 PM
Subject: Re: [time-nuts] Symmetricom 5071A
From: "Dave Carlson" <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] Symmetricom 5
Hello Magnus,
No. Symmetricom NEVER made the tube for the 5071A. Please tell me where you
got that.
The HP/Agilent 10890A and 10891A CBTs could not be legally re-engineered and
the 5071A chassis required that the CBT installed be only one from
HP/Agilent.
Dave carlson
- Original Message
Twin-ax BNC. Trompeter carries them, last I heard.
Dave
- Original Message -
From: "Bill Hawkins" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Monday, 20 June, 2005 9:45 AM
Subject: [time-nuts] Strange connectors
Telco equipment has a BNC shell o
John,
Yes, I would prefer that.
- Original Message -
From: "John Ackermann N8UR" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; "Discussion of precise time and frequency
measurement"
Sent: Wednesday, 15 June, 2005 5:50 AM
Subject: Re: [time-nuts] glossa7 being whiney on eBay...
Brian Kir
which one and
only one sideband was selected. thus the name "Harmonic Generator".
It's a fascinating piece of machined metal and electronics, and is a
conversation piece when employed as a paperweight.
Dave Carlson
- Original Message -
From: "Frequency Standards
erial numbers from
HP in those days, and I suspect that later the standard format was
re-introduced.
After all, without the prefix, it's pretty hard to pin down the general age
of the product and what changes were present.
Dave Carlson
- Original Message -
From: "Javier" &l
ligned harmonic generator is to find another one
that has not been adjusted and attach it to your CBT, or send it to someone
with the correct waveguide fixture.
Dave Carlson
- Original Message -
From: "Frequency Standards & Services" <[EMAIL PROTECTED]>
To: <[EMAIL PROTEC
or by the previous
owner or that as a result of a previous repair a new label was generated as
a replacement and the prefix was not considered relevant.
I also know of no tamper-proof labels used on the 10811 series oscillators.
Dave Carlson
- Original Message -
From: "John Miles
upply installed in the instrument chassis fail to do the job.
Dave Carlson
Original Message -
From: "Chuck Harris" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Thursday, 12 May, 2005 5:36 AM
Subject: Re: [time-nuts] Life
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