5062C
There's an HP 5062C closing on eBay soon!
Corby
Digital Photography - Click Now.
http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTDvmQXaZXHUpXIpXfIn9vPy8MeNSAJr56d1lnRHNzewbrFrUgLyPu/
Speaking of such things, has anybody heard from Scott McGrath,
scmcgrath@gmail.com?
He borrowed my 5065A manual many months ago, to scan, but hasn't
returned it, and doesn't reply to emails.
I would sure like to get it back, and make it available to others
that wanted to borrow it.
-Chuck Harris
Corby Dawson wrote:
There's an HP 5062C closing on eBay soon!
Corby
Digital Photography - Click Now.
http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTDvmQXaZXHUpXIpXfIn9vPy8MeNSAJr56d1lnRHNzewbrFrUgLyPu/
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Seems to be a common problem with certain members on this list. 2 years
ago I sent some short HP applications (on HP mixers) notes to a
certain individual on this list to be scanned and it never happen.
Were too trusting with our data - and some of it is priceless.
Brian Kirby - KD4FM
Chuck Harris wrote:
Speaking of such things, has anybody heard from Scott McGrath,
scmcgrath@gmail.com?
He borrowed my 5065A manual many months ago, to scan, but hasn't
returned it, and doesn't reply to emails.
I would sure like to get it back, and make it available to others
that wanted to borrow it.
-Chuck Harris
Corby Dawson wrote:
There's an HP 5062C closing on eBay soon!
Corby
Digital Photography - Click Now.
http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTDvmQXaZXHUpXIpXfIn9vPy8MeNSAJr56d1lnRHNzewbrFrUgLyPu/
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There's an HP 5062C closing on eBay soon!
Corby
Thanks for the heads-up, Corby, even if it incited a bidding war. :) I
bought it and got it working without much trouble. The problem turned out
to be a resistor that had drifted high and crowbarred the oven-temp shutdown
circuit.
Its cesium tube is elderly but still has some life in it. Beam current is
about 0.47V at the test point (or 10 on the front-panel meter) with the
mass-spec voltage at the first peak of 12.0V, and about 0.68V (~12 on the
meter) with the mass-spec voltage at its highest peak, at 17.5V.
Question: the 5062C manual has some contradictory instructions for setting
the mass-spectrometer bias. Page 4-45 says the adjustment is "correct" when
the beam current is at its lowest-voltage peak. Page 4-56 says "More than
one peak may be indicated... Set MASS SPEC control for highest peak." Which
is optimal? In my case I see a lot more beam current at the 17.5V peak than
at the 12.0V peak, so I'd rather leave it at 17.5.
The bad news is that when I tried installing my spare 5062C Cs tube, which
I'd previously bench-tested successfully, the hot-wire ionizer filament
opened up at some point during the periodic supply-cycling process that
takes place until the ion pump current falls to its normal operating value.
That sucked, because now I'll never know how the bench test results compare
to actual performance in the clock.
I don't see anything I might've done wrong when I installed the other tube.
There was just too much O2 in the envelope, I guess...
-- john, KE5FX
John,
Is that, now unusable tube a surplus for You? I'd have some use for it...
(sectioned, as a display for an University lab)..
Predrag Dukic
University of Split
Croatia
At 08:29 23.3.2009, you wrote:
There's an HP 5062C closing on eBay soon!
Corby
Thanks for the heads-up, Corby, even if it incited a bidding war. :) I
bought it and got it working without much trouble. The problem turned out
to be a resistor that had drifted high and crowbarred the oven-temp shutdown
circuit.
Its cesium tube is elderly but still has some life in it. Beam current is
about 0.47V at the test point (or 10 on the front-panel meter) with the
mass-spec voltage at the first peak of 12.0V, and about 0.68V (~12 on the
meter) with the mass-spec voltage at its highest peak, at 17.5V.
Question: the 5062C manual has some contradictory instructions for setting
the mass-spectrometer bias. Page 4-45 says the adjustment is "correct" when
the beam current is at its lowest-voltage peak. Page 4-56 says "More than
one peak may be indicated... Set MASS SPEC control for highest peak." Which
is optimal? In my case I see a lot more beam current at the 17.5V peak than
at the 12.0V peak, so I'd rather leave it at 17.5.
The bad news is that when I tried installing my spare 5062C Cs tube, which
I'd previously bench-tested successfully, the hot-wire ionizer filament
opened up at some point during the periodic supply-cycling process that
takes place until the ion pump current falls to its normal operating value.
That sucked, because now I'll never know how the bench test results compare
to actual performance in the clock.
I don't see anything I might've done wrong when I installed the other tube.
There was just too much O2 in the envelope, I guess...
-- john, KE5FX
time-nuts mailing list -- time-nuts@febo.com
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and follow the instructions there.
John,
Is that, now unusable tube a surplus for You? I'd have some use
for it...
(sectioned, as a display for an University lab)..
Predrag Dukic
University of Split
Croatia
Sure, Predrag, you're welcome to it. Someone might as well get some use out
of it. Send me your address offline to jmiles@pop.net, and I'll put it on
the slow boat.
I'm sure you know to be careful opening the tube up, as cesium is nasty
stuff.
-- john, KE5FX
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" jmiles@pop.net
To: "Discussion of precise time and frequency measurement"
time-nuts@febo.com
Sent: Monday, March 23, 2009 12:53 PM
Subject: Re: [time-nuts] 5062C
John,
Is that, now unusable tube a surplus for You? I'd have some use
for it...
(sectioned, as a display for an University lab)..
Predrag Dukic
University of Split
Croatia
Sure, Predrag, you're welcome to it. Someone might as well get some use out
of it. Send me your address offline to jmiles@pop.net, and I'll put it on
the slow boat.
I'm sure you know to be careful opening the tube up, as cesium is nasty
stuff.
-- john, KE5FX
time-nuts mailing list -- time-nuts@febo.com
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and follow the instructions there.
No but that's a good question, now that USPS no longer offers a
surface-delivery option. Are there special forms that need to be filled out
when shipping these things by air?
The tube originally came via air from Australia with no special labelling.
-- john, KE5FX
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com]On
Behalf Of Dave Carlson
Sent: Monday, March 23, 2009 3:25 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 5062C
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" jmiles@pop.net
To: "Discussion of precise time and frequency measurement"
time-nuts@febo.com
Sent: Monday, March 23, 2009 12:53 PM
Subject: Re: [time-nuts] 5062C
John,
Is that, now unusable tube a surplus for You? I'd have some use
for it...
(sectioned, as a display for an University lab)..
Predrag Dukic
University of Split
Croatia
Sure, Predrag, you're welcome to it. Someone might as well get
some use out
of it. Send me your address offline to jmiles@pop.net, and I'll put it on
the slow boat.
I'm sure you know to be careful opening the tube up, as cesium is nasty
stuff.
-- john, KE5FX
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
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time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
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Someone on the list mentioned that Cesium tubes are exempt....
(well contained, small quantity)
Predrag
At 23:47 23.3.2009, you wrote:
No but that's a good question, now that USPS no longer offers a
surface-delivery option. Are there special forms that need to be filled out
when shipping these things by air?
The tube originally came via air from Australia with no special labelling.
-- john, KE5FX
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com]On
Behalf Of Dave Carlson
Sent: Monday, March 23, 2009 3:25 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 5062C
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" jmiles@pop.net
To: "Discussion of precise time and frequency measurement"
time-nuts@febo.com
Sent: Monday, March 23, 2009 12:53 PM
Subject: Re: [time-nuts] 5062C
John,
Is that, now unusable tube a surplus for You? I'd have some use
for it...
(sectioned, as a display for an University lab)..
Predrag Dukic
University of Split
Croatia
Sure, Predrag, you're welcome to it. Someone might as well get
some use out
of it. Send me your address offline to jmiles@pop.net, and I'll put it on
the slow boat.
I'm sure you know to be careful opening the tube up, as cesium is nasty
stuff.
-- john, KE5FX
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
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time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
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" jmiles@pop.net
To: "Discussion of precise time and frequency measurement"
time-nuts@febo.com
Sent: Monday, March 23, 2009 12:53 PM
Subject: Re: [time-nuts] 5062C
John,
Is that, now unusable tube a surplus for You? I'd have some use
for it...
(sectioned, as a display for an University lab)..
Predrag Dukic
University of Split
Croatia
Sure, Predrag, you're welcome to it. Someone might as well get some use out
of it. Send me your address offline to jmiles@pop.net, and I'll put it on
the slow boat.
I'm sure you know to be careful opening the tube up, as cesium is nasty
stuff.
-- john, KE5FX
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
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