Re: A homemade diode power sensor for HP meters
Hi Jeff:
Isn't this a years old thread?
Did this home brew power sensor project go anywhere, in the mean time?
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Re: Retrofitting 3.5mm connector from HP 8485A sensor onto an existing HP 8481A sensor - possible?
Thank you for detail understanding!
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Re: looking for service manual for HP4934A
Dave,
Maybe its the about the same inside??
Please upload it to the files area. I will download and take a look at it.
Thanks
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Re: looking for service manual for HP4934A
Thanks Peter, maybe that it. Its covered in another model numbers manual.
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Re: Retrofitting 3.5mm connector from HP 8485A sensor onto an existing HP 8481A sensor - possible?
From experience, the 8481A series does not perform up well beyond 18 GHz. The response drops very quickly towards 19/20 GHz, and at 26.5 GHz, the response difference is more than 3 to 4 dB. The N connector is not responsible for this poor performance, as 85025A detectors easily perform up to 40 GHz with only a few glitches due to VSWR beyond 18.6 GHz. Conversely, an 8485A often performs up to 30 or even 33 GHz.
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Re: microscope / high magnification camera options for soldering, faults, and other examinations/inspections
I purchase a used Nikon 8x, 20x, 100x binocular microscope quite a while ago, added the Illuminator ring. It is a superb instrument, but not light in weight. Price was $75 then, 15 yrs. ago. I have seen several name brand microscopes in government surplus auctions recently in the $75-150 range, ie. Bausch & Lomb, Nikon, etc. For a quick and dirty usage, Chinese will work, mostly, but for serious work, the used name brands are a great investment.
Don Bitters
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Retrofitting 3.5mm connector from HP 8485A sensor onto an existing HP 8481A sensor - possible?
Have a HP 8485A sensor I bought used, turns out it had been damaged due to overload, seller refunded, now have a physically nice but electrically dead HP 8485A sensor.
Have a HP 8481A sensor surplus to my needs.
I'm interested in the possibility of converting my 8481A to an 8485A (3.5mm male connector), albeit not calibrated, in lieu of the cost of buying a working 8485A.
Found a Keysight publication that seems to be quite comprehensive coverage of this era sensor:
This is titled "Keysight 8480 series coaxial power sensors operating and service manual." I wasn't aware the manual existed; it is current publication from Keysight.
The manual has pretty extensive "how to disassemble and reassemble" and other maintenance activities.
The underlying thermocouple sensor element appears to be the same part number for 8481A and 8485A, so this brings me to my question - could I create a thermocouple sensor with a 3.5mm HP male connector that could subsequently be recalibrated and used as an 8485A?
I've searched and haven't found any reports of the practicality or result of actually trying this procedure.
Thanks for any comments, observations, or requests for clarification.
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Re: microscope / high magnification camera options for soldering, faults, and other examinations/inspections
On 3/20/25 13:54, Radu Bogdan Dicher via groups.io wrote: WIFT trinocular brand new (any input on the brand?). If it says made in China, they are mostly subpar compared to used good Euro and Japan lenses.
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Re: microscope / high magnification camera options for soldering, faults, and other examinations/inspections
A bit of a follow up on this. I think the point about stereo microscopes giving indication of depth is invaluable, and exactly the kind of information one hopes to get on here.?
But I will say I also got one of these "thick pen" sized microscope cameras - working wirelessly on phones, or through USB on computers - and I think this is an excellent addition to the bench. Its best use is inspection - where the large screen does a tremendous job at displaying huge solder joints and component pins and?burned flux etc - and not soldering, due to the point above. I paid about $30 for mine, which I think is a steal for what it does.?
Certainly, I'm still pursuing getting a real, lab-grade stereo microscope. Currently hesitating between giving the Nikon(s) I mentioned above a test drive, and just biting the bullet and getting a SWIFT trinocular brand new (any input on the brand?).? Radu.?
On Tue, Mar 18, 2025 at 8:56?PM Radu Bogdan Dicher via <vondicher= [email protected]> wrote: To assist with feedback on this local offer for the Nikon microscopes, I uploaded to the photos section pictures of the two units this local seller has: /g/HP-Agilent-Keysight-equipment/album?id=301362.? A couple of questions: - Is anyone familiar enough to maybe tell what the differences between the two are? I'm not sure which one I should get, if I go for this.?
- I think both seem to come with booms, which I think are a little costly on their own. Maybe this makes their offer a bit more competitive??
Thank you, Radu.?
And that, my dear sir, is exactly why I wrote the program.
Please contact me off? list.? I didn't exactly design some of this for
public consumption (mostly the Embarcadaro stuff), and you'll need the
libraries I've created.
Haven't tried to rehost it, so it'll be an experience.
madyn@...
Harvey
On 3/18/2025 4:59 PM, David McQuate via wrote:
>
> I use C++ a lot, usually with QtCreator, though I have previously used
> Visual Studio.? I have Eagle 7.5, 7.6, and 7.7.? I use SCAD for 3D
> printing and also for general 3D modeling.? Your program seems like a
> natural for designing 3D printed cases for PC boards, and also for
> creating parts placement files for automated PC builds, such as that
> done by JLCPCB.? Would you be OK giving me a copy of the source?
>
> David
>
> On 2025-03-18 13:14, Harvey White wrote:
>
>> I wrote a C++ program that disassembles the .brd file for a project.
>> It creates an OpenSCAD document that places models of the parts onto
>> the board, giving you a board visualization.? It can handle internal
>> and external fillets on the board edges. Depending on which parts you
>> use, you may or may not need to model some specific parts (in
>> OpenSCAD) to build up your own library.
>>
>> As part of the process, the program has to read and calculate the
>> part placement? from the .brd file.? I know it does EAGLE 7.7, not
>> sure about what else.
>>
>> It was originally based on NopHead's libraries, but I got errors I
>> couldn't track down (not documented), and just bagged it and wrote my
>> own.
>>
>> How?are?you?with?C++?(Embarcadero?C++?community?version)?
>>
>> Harvey
>>
>> ps:?I?can?attach?a?picture.
>>
>>
>>
>> On?3/17/2025?11:29?PM,?David?McQuate?via??wrote:
>>>
>>> I'd like to know more about the program that allows you to model the
>>> PC board in SCAD, and find the XY of any part.
>>>
>>> Thanks!
>>>
>>> David
>>>
>>> On?2025-03-17?20:01,?Harvey?White?wrote:
>>>
>>>> I use an American Optical (because it was cheap) and found a nice
>>>> heavy stand to hold it up.? I have a fiber optic ring light on the
>>>> microscope.
>>>>
>>>> I?find?that?an?auxiliary?light?can?help?to?illuminate?from?the?side?as?well.
>>>>
>>>> I would build a board holder that allows you to position any part
>>>> of a board under the microscope without moving the microscope. How
>>>> complicated you make that little board holder is up to you. Maybe
>>>> move manually and lock into place.
>>>>
>>>> if you were building boards by hand, and using EAGLE, then I can
>>>> show you a program that models the PC board in OpenSCAD. That same
>>>> parsing routine can find the XY of any part.
>>>>
>>>> that?might?help?a?bit.
>>>>
>>>> Ideally, you want to move the board in X and Y, then rotate for the
>>>> best soldering angle.
>>>>
>>>> Harvey
>>>>
>>>>
>>>>
>>>> On?3/17/2025?2:59?PM,?Radu?Bogdan?Dicher?via??wrote:
>>>>>
>>>>> Thank?you?all,?great?input.
>>>>> From these choices, it sounds like a stereo microscope on a boom
>>>>> would be ideal. I do tend to work on all sorts of positions and
>>>>> oftentimes spill outside of the desk/bench. Also, some of the
>>>>> boards I need to examine are too large to fit under a microscope
>>>>> with a stand. I'm not sure exactly how well this relative freedom
>>>>> to move the microscope around works. But the idea to have that
>>>>> available is very exciting - I'm really tired of using my multiple
>>>>> hand magnifiers with their own lights and often another flashlight
>>>>> on the other hand. My eyes get terribly strained with that setup.
>>>>> Probably a stupid question, but I know nothing on the "stereo
>>>>> microscope" topic - are these working well for people wearing glasses?
>>>>> Thank?you.
>>>>> Radu.
>>>>>
>>>>>
>>>>> On Mon, Mar 17, 2025, 10:29 AM John Griessen via
>>>>> <> <john=[email protected]> wrote:
>>>>>
>>>>> ????On?3/17/25?07:59,?Dave?McGuire?via??<>?wrote:
>>>>> ????>?On?3/17/25?00:02,?Radu?Bogdan?Dicher?via?
>>>>> ????<>?wrote:
>>>>> ????>>?Having?done?enough?(red)?eye?cracking?smd?soldering?jobs?or
>>>>> ????inspections?in?case?of?suspected?failure?(cold?joints,?etc.),?I've
>>>>> ????>>?decided?to?invest?a?bit?on?a?better?optical?setup.
>>>>> ????>>?There's?plenty?of?cameras?on?the?marketplaces?and?retailers?out
>>>>> ????there,?but?what?are?some?better?choices??Good?experiences?with
>>>>> ????>>?some?specific?models?
>>>>> ????>>?Also,?what?to?watch?for??Specs,?minimal?magnification?that
>>>>> ????crosses?over?a?good?threshold?
>>>>> ????>>?I?have?a?couple?of?large?screens?at?my?bench?-?I'm?thinking
>>>>> ????this?will?be?best?done?by?shooting?this?over?to?one?of?those.?USB,
>>>>> ????>>?HDMI?...
>>>>> ????>>?Lighting/LEDs?making?a?significant?difference?
>>>>> ????>>?Thank?you?for?your?input.
>>>>> ????>
>>>>> ????>????The?Mantis?by?Vision?Engineering.
>>>>> ????>
>>>>> ????>????On?the?prototyping?bench?I?moved?from?a?Nikon?SMZ-1?with?an
>>>>> ????after-market?LED?ring?light?to?a?1st-generation?Mantis?about?ten
>>>>> ????>?years?ago,?and?upgraded?to?a?Mantis?Elite?last?year.
>>>>> ????>
>>>>> ????>????The?Nikon?is?a?binocular?inspection?microscope?with?great
>>>>> ????optics?(typical?of?Nikon)?and?excellent?overall?performance.??I?had
>>>>> ????>?an?opportunity?to?try?out?a?Mantis?when?visiting?a?customer's
>>>>> ????lab.??I?was?astonished?by?its?capabilities?and?purchased?one
>>>>> ????>?immediately.
>>>>> ????>
>>>>> ????>????My?upgrade?to?the?Mantis?Elite?last?year?was?a?similarly
>>>>> ????impressive?thing.
>>>>> ????>
>>>>> ????>????Two?important?considerations?are?binocular?optical?paths?and
>>>>> ????lighting.
>>>>> ????>
>>>>> ????>????Binocular?optics?are,?IMO,?absolutely?required?for?SMT?work.
>>>>> ????>
>>>>> ????>????Lighting?is?next.??People?often?skimp?on?this?and?use?a
>>>>> ????random?desk?lamp?or?whatever?happens?to?be?lying?around,?but?a?proper
>>>>> ????>?lighting?system?makes?all?the?difference.??There?are?cheap
>>>>> ????aftermarket?LED?right?lights?that?are?surprisingly?effective;?this
>>>>> ????>?suggests?that?the?lighting?really?isn't?that?difficult?a?problem
>>>>> ????to?solve.??The?key?is?360-degree,?oblique,?even?lighting?to
>>>>> ????>?eliminate?shadows.??(lighting?is?built-in?on?the?Mantis?microscopes)
>>>>> ????>
>>>>> ????>???????????????-Dave
>>>>>
>>>>> ????Hi?Radu,
>>>>>
>>>>> ????I've?got?Greenough?scopes?(binocular)?by?Olympus?and?Vision
>>>>> ????Engineering?(precursor?to?Mantis),?and?fiber?light?rings?and?sources
>>>>> ????to?sell.
>>>>>
>>>>> ????The?Vision?Engineering?ones?are?kind?of?large,?but?trying?an
>>>>> ????Olympus??Greenough?would?be?painless?--?you?could?return?it?if?not
>>>>> ????liking?it.
>>>>>
>>>>> ????When?I?assemble?SMT?boards?I?use?a?Greenough?on?a?boom?that?lets
>>>>> ????me?move?with?fine?dials?in?X?and?Y?(and?of?course?Z?for?focus).
>>>>>
>>>>> ????I've?also?tried?the?Vision?Engineering?and?it?would?probably?be?a
>>>>> ????speedup?tool,?but?Ive?not?afforded?enough?bench?top?space?to?use
>>>>> ????one?effectively?yet.
>>>>>
>>>>> ????Also?have?Nikon?SMZ-7?and?a??Vision?Engineering?Greenough?for?sale.
>>>>>
>>>>> ????Booms?to?hold?them?are?super?heavy,?so?looking?locally?makes?the
>>>>> ????most?sense.
>>>>>
>>>>> ????I?agree?with?Dave,?that?if?you?want?to?do?prototypes?your?speed
>>>>> ????and?quality?will
>>>>> ????improve?drastically?with?stereo?vision?--?it?puts?your?"there"?in
>>>>> ????the?micro?world...??Also?you?will?notice?more?since?flat?view
>>>>> ????onscreen?doesn't?translate?to?3D?in?your?mind?well.
>>>>>
>>>>> ????The?large?screens?might?be?OK?for?some?things,?but?not?for?active
>>>>> ????seeing?when?looking?for?tiny?cracks,?missing?solder,?adequate
>>>>> ????solder?paste,?etc.
>>>>>
>>>>> ????Now?to?get?busy?cleaning?and?photographing?the?ones?I?mentioned...
>>>>> ????--?????John?Griessen
>>>>> ????Albuquerque?NM
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>
>>
>>
>>
>>
>>
>
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"Jean-Luc F1ULQ via groups.io" <f1ulq@...> writes: Hi Sven,
you have to place a new CR2032 on the mainboard, then do a CMOS
default and set the correct date/time.
Normally, after that all should be OK. I had the same issue on mine,
fixed it that way. Thanks, good to know that this must work - i was afraid of some bug or unknown procedure. In the beginning this didn't work for me with the symptoms I described. I left the unit without battery for a night and than it worked the way you described and i was happy. But Windows XP crashed later during the day, and after that it didn't work again. Also had some problems that USB didn't work. I now bought an old used mainboard with the same form factor and PCI slots, an Asus P8B75. Hope i can implant this, not sure how compatible the Agilent Software is with other boards. Would also be a nice upgrade as this one has an i5-3330. Maybe i'll even try Windows 7. 73 DM1SV
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Re: Agilent/Keysigh ESG series CLIP
The exact P/N of the board Is E4400-60141
?
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Re: 5041-8820 Rear Strap Handle Cap — 3D print files?
Peter, Radu,
Great stuff.
I have used PLA from Farnell and Prusa MK4 printer.
Here is the .step file.
Leo
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Re: Agilent/Keysigh ESG series CLIP
Check the tantalums, they usually fail short-circuit.
What exact part number of the board is it? Agilent had a few versions.
Leo
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Re: Agilent/Keysigh ESG series CLIP
Wait till tonight, not at home now, will check what I have.
Milan
Hello Milan,
?
I have no intention of distributing the document. I have a short on the -15V of the A9 module (Vector Output), which pulls the power supply down and prevents the device from turning on.
In any case, if it’s not possible for you to send me the full document, could you send me only the page for the A9 module with the UNB option (P/N: E4400-60141)?
That would be a great help.
?
Thanks
Santiago
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Re: Agilent/Keysigh ESG series CLIP
Hello Milan,
?
I have no intention of distributing the document. I have a short on the -15V of the A9 module (Vector Output), which pulls the power supply down and prevents the device from turning on.
In any case, if it’s not possible for you to send me the full document, could you send me only the page for the A9 module with the UNB option (P/N: E4400-60141)?
That would be a great help.
?
Thanks
Santiago
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Re: Agilent/Keysigh ESG series CLIP
Guys,
Do what you think that's fair play....I spent 2 weeks to scan and rectify....
Good luck with ESG's
Milan
On Thu, 20 Mar 2025, 13:55 alberto.vaudagna via , <alberto.vaudagna= [email protected]> wrote: but I really think they are bot the same copy. I mean can that user have begun to sell the Milan version on eBay?
Il giorno gio 20 mar 2025 alle ore 12:39 Leo Bodnar via <leo= [email protected]> ha scritto: Hi Milan,
I have bought mine in 2018 from a random eBay dude with account called "Jimt4".
Was that you? If not, I assume am free to pass them on.
Leo
--
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Re: HP 8673D synthesized generator - need help identifying the two PC boards attached to A1A11 power amplifier
The lift table sounds like a useful boat anchor manipulation device.? I am of "that age" but am still very good at lifting (everyone is good at something in the gym).? However, sidelined a couple of months due to having to go to the maintenance facility for a shoulder repair for a different injury and the doc telling me no heavy lifting for a bit.? So for now, circuit development and debug of tiny stuff like 0402 SMD parts.
I have to get into my 8660D which I still like for lower frequency RF work as other more modern units I have (modern is relative) don't go below 300 kHz.? The 8660D mainframe is alright but could use a tuneup but the low frequency plugin has no output.? I will probably need to make an extender.? I do have parts and harnesses from a scrapped 8660 mainframe I grabbed that someone had left as trash at the end of a hamfest so maybe can make an extension cable with those Winshester-looking connectors.
Most of the alignments and adjustments in the 8660 can be done without extenders but some steps can't be done without.
Due to how busy I am I think this will need to wait a few months but it will happen!
Peter
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Show quoted text
On 3/19/2025 4:49 PM, David Feldman via groups.io wrote: Peter - yes - beast (trivia - back in about 1981 I was one of hundreds of volunteer extras (person-sized bird characters) for a movie being filmed north of Los Angeles called "the beastmaster" - never saw the movie!.)
A recently purchased (earlier this week) VEVOR TFD15 hydraulic lift table has made 1000% improvement in handling these heavy/old machines (8660, 8350, 8673) which use linear/transformer power supplies and are made of 100% pure cast iron straight from the mine. Highly recommend such a thing for those of us "of a certain age" that still wrangle electronics by the metric ton.
Determined course of action at this point --- going to build extender mechanism to allow the pictured module to operate outside the synthesizer. 6x2 3.94mm card edge connector, already have PCBs with 3.94mm pitch traces for making these sorts of things, and 14-pin IDC DIP male plugs to make the 2-port ribbon cable that appears to go off in the direction of the YTO, are both on order, couple weeks til delivery, so machine is back to it's "hangar queen" location until I am ready for testing.
Barring any other adds to this discussion, I'll surface again with the topic once I am able operate the module(s) outside the synthesizer chassis.
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Re: 5041-8820 Rear Strap Handle Cap — 3D print files?
Leo, Awesome, looks great. I could have offered a 3D print file for the other end of the handle:? Radu.?
Oh, well I quickly knocked it up myself.
Leo
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Re: 5041-8820 Rear Strap Handle Cap — 3D print files?
Nice!? What printer and plastic did you use?
I just got Catia installed on my machine and starting training
(mostly, how to work with the company document management system)
so should be able to start making up parts at some point.
Peter
On 3/20/2025 8:58 AM, Leo Bodnar via
groups.io wrote:
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Show quoted text
Oh, well I quickly knocked it up myself.
Leo
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Re: 5041-8820 Rear Strap Handle Cap — 3D print files?
Oh, well I quickly knocked it up myself.
Leo
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Santiago Z