Re: Jacks added to 6623A System PSU
On 4/19/20 1:56 PM, Michael Dunn wrote: I got a good deal on a 6623A triple system PSU last year, and finally
added binding posts to it (it only sports rear screw terminals as-is):
/g/HP-Agilent-Keysight-equipment/album?id=245498
Not the greatest model to use as a bench supply, but one makes do... Nice solution! -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Jacks added to 6623A System PSU
I got a good deal on a 6623A triple system PSU last year, and finally added binding posts to it (it only sports rear screw terminals as-is): /g/HP-Agilent-Keysight-equipment/album?id=245498Not the greatest model to use as a bench supply, but one makes do... All that remains is to make links to join the output & sense posts. I've ordered some sheet brass & aluminum. Does anyone know a source for pre-made ones?
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Re: new File called App notes
On 4/19/20 4:16 AM, Paul Bicknell wrote: Thank you for your input but I think the Dave's were having a laugh at
my expense as I hade reduced Application notes to a shortened version? Not really, no. While I will rarely pass up the opportunity to have a laugh at someone else's expense (I can't help it!) in this instance I was, and am still, honestly shocked that anyone involved with tech work, today or thirty years ago, wouldn't know what an app note is. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: new File called App notes
On 4/19/20 12:14 AM, Richard Knoppow wrote: ?? App notes mean Application notes. Publications that explained how to
use instruments. They varied from a single sheet to practically a book.
-hp- had some very good app notes on spectrum analysis and impedance
mesurement. General Radio also published ap notes on various techniques
such as sound measurement. These publications were often ahead of any
text book. They've never been restricted to being about how to use instruments. Many are about how to perform measurements, and other non-instrument-specific stuff. For example, the "bible" of that mysterious "guard" terminal on high-end voltmeters: AN123, "Floating Measurements and Guarding", from HP. App notes also come from component manufacturers...usually (but not always!) they are about applications for a specific component, but many many of them are much more general. There's practically an EE degree's worth of information distilled in the ones published by Linear Technology over the years, for example. ?? I don't mean to take this away from Dave but its an example to me of
how once perfectly obvious meanings have been lost with time. Uhh...this is a very current term. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: new File called App notes
On 4/18/20 10:37 PM, Paul Bicknell wrote: I have already had my leg pulled about calling them (App notes)
As apparently it ids not considered correct English It's fine English. They usually (but don't always) say "Application Note" at the top, but the whole engineering world calls them "app notes" today, as we have for decades. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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VXI documentation, was Re: [HP-Agilent-Keysight-equipment] new File called App notes
On 4/18/20 8:10 PM, Andy ZL3AG via groups.io wrote: ANYTHING that is on the Keysight website and nowhere else needs to be
archived ASAP. Lots of really useful stuff has already disappeared -
much of it on agilent.com URL's. If they split Keysight up and the TE
goes with the new brand AGAIN, we're screwed! Yes, agreed 100%. These days, web sites are controlled by suits, and suits are not to be trusted with anything of value. I've being trying to hunt down VXI stuff and it comes up on the Google,
but points to web/ftp hosts that no longer exist. :^( I use VXI a lot, and I have tons of VXI documentation in PDF format for lots of different things. Email me if you're looking for something specific, or if you want to sync up documentation collections in some way. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: new File called App notes
Hi bill thank you
It appears there are possibly 3 sites with application notes on just
requires the contents of each site for a listing off the application notes
it has
Then perhaps we can fill in the missing ones to each site
So I assume we can use your list to help fill in any missing ones for the
benefit of all
Regards Paul
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-----Original Message----- From: [email protected][mailto: [email protected]] On Behalf Of Bill Perkins Sent: 19 April 2020 16:28 To: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] new File called App notes There's a 100MB .zip you are welcome to pull down and re-up from your side: /HP_App_Notes_Hbooks_Seminars/HP_App_Notes_Hbooks_Seminars.zip Bill @ PEARL, Inc. > > Hi all > > > > Recently I have been looking at app notes for equipment and realised we do > > not have a collection on the site > > > > So In the File section I have made a File called App notes** > > > > Could I ask you all to help with putting any App notes you have in PDF > > format into the new file > > > > Best Regards Paul ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18 Internal Virus Database is out of date.
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Re: Application Note 122: EMI Measurement Procedure
That APP Note is not listed in any of my indexes that cover all notes from beginning until 1989.
Is that a more recent note?? ?I have most in the set up into the 1990s
As a young engineer just out of university I grabbed everything I could from HP in catalogs and notes to read to get up to speed fast.
George
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Re: HP 53310A - Why did I not know about this sooner?
Hello,
sadly, all of the caps on mine went into the trash. So I can only
show the pictures I had in the video...
Tam
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
On 2020. 04. 19. 16:53, Tom Gardner
wrote:
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Show quoted text
That may depend on the revision.
I've just pulled my 53310a psu.
It is version S and, as far as I can tell, has datecodes
relating to '93 or '94.
One cap that I can read indicates Rubycon.
The others I can't read, but are all the type of label, and I
suspect they are Rubycon.
According to wackypedia, the plague was due to caps produced in
'99 to '03, failing in '02 to '05
The problem was the incorrect formula was stolen from
Rubycon.
None of that indicates whether the caps do need replacing, but
ascribing the capacitor plague doesn't seem right.
Quite frankly I'm in two minds about recapping my supply.
On 19/04/20 13:07, John Sager wrote:
Tam,
That's useful to know. I pulled the PSU on mine a year or two
back & gave it a good lookover & test. The caps all
looked fine then. Perhaps a precautionary changeout would be
wise.
John
On 19/04/2020 06:55, Tam Hanna wrote:
As for the PSU: IMHO, the company making
these got burnt in the big Capacitor plague. So all of them
will fail eventually - if not today, then in a month. My
former lab gypsy has a friend who decided to wait it out, and
her PSU was almost impossible to fix...in the end, we deduced
that a crawl current across the electrolyte made one of the
voltage regulators horny somehow...turned out to be a nasty
repair.
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Re: HP 652A Dial Calibration
The SM does discuss changing resistors on the range switch but it seems that's done for ranges other than the 1K range where the initial dial calibration is done. Plotting the frequencies and test point A2PT2 voltages for all calibration points to get a better idea of the overall status of these points is a good idea and I may follow through on that. I presume if there's a particular range where the calibration points are worse than others, then possibly getting that one closer may have a positive effect on the other ranges.
The only problem with changing range switch resistors is finding resistors with just the right values. I suppose that may involve getting creative with parallel resistors, etc., to achieve that but it's worth a try.
The tuning cap on this one is fairly clean - in fact, all the interior is relatively clean so I'm fortunate in that respect with an estate-sale find!
Thanks,
Barry - N4BUQ
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----- Original Message ----- From: "David Platt" <dplatt-groups@...>
To: [email protected]
Sent: Saturday, April 18, 2020 10:52:18 PM
Subject: Re: [HP-Agilent-Keysight-equipment] HP 652A Dial Calibration
I agree, it's not a good idea to start bending plates on that big three-way
air variable capacitor.? Once done there's really no way to go back, and I
suspect you'd be likely to make things worse rather than better.
The HP 651 has a complex frequency-calibration procedure in the service
manual.? Adjusting the calibration on some bands requires changing out a
pair of selected-at-manufacture-time resistors on the bandswitch.? For some
other band there's an adjustment capacitor.? I believe that the 652 has the
same architecture, and I'd recommend following the manual instructions
carefully if you decide to do this.
One thing it would probably be good to do first... measure, record, and plot
the actual frequencies on each of the bands at each major digit position.
? By comparing the bands you may be able to see whether there's an overall
shift in the calibration affecting most or all of the bands (which would
point to a dial-positioning or main-capacitor issue) or whether some bands
are shifted differently than others (which might suggest that the
band-specific resistors or caps are out of whack).
The 651B is only spec'ed to 2% frequency accuracy on some bands and 3% on
others, so exact dial calibration can't really be expected.
Oh... make sure that you take your measurements with the cabinet lid and base
on and the screws tightened, as the manual advises.? There's a very
significant frequency and calibration shift if you take off the lid... the
parasitic capacitance from the active circuit to the case is part of the
equation!
Also, check the tuning cap for contamination (dust, etc.) - if there's any
present it could throw things off.? I bought a 651 which was quite balky and
wouldn't oscillate at all in some portions of the dial range (on any band).
? I found some dark gunk on the plates, and splashed in a few places around
the base of the capacitor... looked as if somebody had spattered Coca Cola
on it.? It took a good, careful water-wash to get it out (and then a spritz
with contact cleaner to flush out the water, and some blown air to dry it
properly) and now it oscillates and tracks nicely.? (It also had the "HP
grease turns to cement with age" problem, and I had to do a
strip-down/clean/lubricate much as you did.)
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Re: new File called App notes
There's a 100MB .zip you are welcome to pull down and re-up from your side: Bill @ PEARL, Inc. Hi all
Recently I have been looking at app notes for equipment and
realised we do not have a collection on the site
So In the File section I have made a File called App notes**
Could I ask you all to help with putting any App notes you have in PDF
format into the new file
Best Regards Paul
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Re: HP 53310A - Why did I not know about this sooner?
That may depend on the revision.
I've just pulled my 53310a psu.
It is version S and, as far as I can tell, has datecodes relating
to '93 or '94.
One cap that I can read indicates Rubycon.
The others I can't read, but are all the type of label, and I
suspect they are Rubycon.
According to wackypedia, the plague was due to caps produced in
'99 to '03, failing in '02 to '05
The problem was the incorrect formula was stolen from
Rubycon.
None of that indicates whether the caps do need replacing, but
ascribing the capacitor plague doesn't seem right.
Quite frankly I'm in two minds about recapping my supply.
On 19/04/20 13:07, John Sager wrote:
toggle quoted message
Show quoted text
Tam,
That's useful to know. I pulled the PSU on mine a year or two back
& gave it a good lookover & test. The caps all looked fine
then. Perhaps a precautionary changeout would be wise.
John
On 19/04/2020 06:55, Tam Hanna wrote:
As for the PSU: IMHO, the company making
these got burnt in the big Capacitor plague. So all of them will
fail eventually - if not today, then in a month. My former lab
gypsy has a friend who decided to wait it out, and her PSU was
almost impossible to fix...in the end, we deduced that a crawl
current across the electrolyte made one of the voltage
regulators horny somehow...turned out to be a nasty repair.
|
Re: HP 53310A - Why did I not know about this sooner?
Yes, this one really rapes the kid. The issue is that it comes, hits the unit, and goes again with nothing, nothing visible.
My wife and I had the unit open, only to have it resume booting. We closed it, it booted for some time. Then it stopped again.
Tam
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
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On 2020. 04. 19. 16:44, John Sager wrote: Not seen that one yet, thank goodness!
John
On 19/04/2020 13:23, Tam Hanna wrote:
Hello,
definitely.
I would also keep an eye on "the plague". It struck a gaggle of MDOs recently, but they then all regenerated again. I can, however, share this picture:
Tam
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
On 2020. 04. 19. 14:07, John Sager wrote:
Tam,
That's useful to know. I pulled the PSU on mine a year or two back & gave it a good lookover & test. The caps all looked fine then. Perhaps a precautionary changeout would be wise.
John
On 19/04/2020 06:55, Tam Hanna wrote:
As for the PSU: IMHO, the company making these got burnt in the big Capacitor plague. So all of them will fail eventually - if not today, then in a month. My former lab gypsy has a friend who decided to wait it out, and her PSU was almost impossible to fix...in the end, we deduced that a crawl current across the electrolyte made one of the voltage regulators horny somehow...turned out to be a nasty repair.
|
Re: HP 53310A - Why did I not know about this sooner?
Not seen that one yet, thank goodness!
John
toggle quoted message
Show quoted text
On 19/04/2020 13:23, Tam Hanna wrote: Hello,
definitely.
I would also keep an eye on "the plague". It struck a gaggle of MDOs recently, but they then all regenerated again. I can, however, share this picture:
Tam
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
On 2020. 04. 19. 14:07, John Sager wrote:
Tam,
That's useful to know. I pulled the PSU on mine a year or two back & gave it a good lookover & test. The caps all looked fine then. Perhaps a precautionary changeout would be wise.
John
On 19/04/2020 06:55, Tam Hanna wrote:
As for the PSU: IMHO, the company making these got burnt in the big Capacitor plague. So all of them will fail eventually - if not today, then in a month. My former lab gypsy has a friend who decided to wait it out, and her PSU was almost impossible to fix...in the end, we deduced that a crawl current across the electrolyte made one of the voltage regulators horny somehow...turned out to be a nasty repair.
|
Re: Agilent 8753es Option 11 and TDR Measurements...
John,
Thanks for you guidance, It helps a lot.
To give you a little background in how I've been using my 8753es and some
of the hardware I have... I use it mostly for broadcast antenna
measurements and antenna tuning. In many cases doing this on antennas in
a high RF environment.? In order to do that I feed the RF out into
an ENI 310L RF amplifier, which gives me about 10 watts out.? That
feeds a (50 MHz to 1000 MHz) NARDA 3020A dual directional coupler through
a 10 dB 50 watt attenuator to keep the amplifier happy.? The forward
sample of the NARDA feeds the R input through a 20 dB pad, although I
suppose I could feed the R input using a splitter directly off the RF
out; one branch feeding the R input and the other branch feeding the ENI
input.? The reflected sample feeds the A receiver via a 20 dB pad,
and considering the return coupling I have about 40 dB of attenuation
between the reflected and the A input.? I calibrate the system to
the far end of my test cable using a Short', Open, and known 10 watt load
that's sufficient for this frequency range.? Before I had the 8753es
I used a spectrum analyzer with a tracking generator with the above
stuffs as a Scalar Analyzer.? This method has worked out quite
well.?
What do I want to be able to do?? I also want to be able to look
at/sweep transmission lines, and typically with an antenna on the other
end that's in a high RF environment.? Hence the need for the RF amp
and a passel of attenuators to safely override what's coming back down
the antennas from other stuffs - more of a "High Power" FDR
system rather than TDR.? I have a Tek 1503C that I have used, but
that requires disconnecting the transmission line at the top end, but
that doesn't always show me what I'm looking for.?
Does my description make any sense to you?
Again, your guidance is sincerely appreciated.
Burt, K6OQK
3b.
Re: Agilent 8753es Option 11 and TDR Measurements...
From:
John Gord
Date: Sat, 18 Apr 2020 22:31:33 PDT
Burt,
? I think that the minimum you can get by with for TDR
measurements with option 10 is a splitter and a coupler (or bridge).
(That is most of a T/R test set). The source connector feeds the
splitter, which then feeds the R channel and the coupler. The coupler
connects to the DUT, and the coupled reflected signal from the DUT
connects to the A channel. There are cheap ($12) 3GHz bridges on eBay
that would probably do for a start. You would also need short, open, and
load standards for whatever sort of connectors your DUT has. You can
look up how to make your own standards.
? If you find a dual directional coupler that covers the
frequencies you are interested in, you can skip the splitter. The
forward coupled path goes to the R input, the reverse coupled path goes
to A.
--John Gord
Agilent 8753es Option 11 and TDR Measurements...
From:
Burt K6OQK
Date: Sat, 18 Apr 2020 20:37:04 PDT
Greetings all,
I have an Agilent 8753es Option 11 and Option 10 instrument. My question
is... Does it require the S Parameter unit (underneath thingy) in order
to make TDR/FDR measurements? I do not have the S Parameter unit.
Thanks,
Burt, K6OQK
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California U.S.A.
biwa@...
K6OQK
--
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, CA 91201 U.S.A.
K6OQK
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Re: Do ManualsPlus still exist
Hi good to se them preserved but unlike
historical documents? we need them now as the equipment in 10 to 15 years time will
not exist unless manuals can be found
?
Best of British Paul
?
?
I think the remainder of their inventory was donated to the Internet
Archive.
Eventually with time everything will be scanned.
Richard
No virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.
|
Re: Do ManualsPlus still exist
I think the remainder of their inventory was donated to the Internet Archive.
Eventually with time everything will be scanned.
Richard
|
Re: HP 53310A - Why did I not know about this sooner?
Hello,
definitely.
I would also keep an eye on "the plague". It struck a gaggle of MDOs recently, but they then all regenerated again. I can, however, share this picture:
Tam
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
toggle quoted message
Show quoted text
On 2020. 04. 19. 14:07, John Sager wrote: Tam,
That's useful to know. I pulled the PSU on mine a year or two back & gave it a good lookover & test. The caps all looked fine then. Perhaps a precautionary changeout would be wise.
John
On 19/04/2020 06:55, Tam Hanna wrote:
As for the PSU: IMHO, the company making these got burnt in the big Capacitor plague. So all of them will fail eventually - if not today, then in a month. My former lab gypsy has a friend who decided to wait it out, and her PSU was almost impossible to fix...in the end, we deduced that a crawl current across the electrolyte made one of the voltage regulators horny somehow...turned out to be a nasty repair.
|
Re: HP 53310A - Why did I not know about this sooner?
Tam,
That's useful to know. I pulled the PSU on mine a year or two back & gave it a good lookover & test. The caps all looked fine then. Perhaps a precautionary changeout would be wise.
John
toggle quoted message
Show quoted text
On 19/04/2020 06:55, Tam Hanna wrote: As for the PSU: IMHO, the company making these got burnt in the big Capacitor plague. So all of them will fail eventually - if not today, then in a month. My former lab gypsy has a friend who decided to wait it out, and her PSU was almost impossible to fix...in the end, we deduced that a crawl current across the electrolyte made one of the voltage regulators horny somehow...turned out to be a nasty repair.
|
Re: new File called App notes
Hi Paul,
it is about 1GB in total.
My HP doc folder is 51GB.
Jos PA0AMX
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Dave McGuire
Michael Dunn
Paul Bicknell
Burt K6OQK
Jos Raven PA0AMX