Re: Damaged HP feet

Thanks Radu !

Following you message , I went to the Anchor Electronics web site and I have discovered the words "Square base (tapered) bumper" as in fact I was searching on the web with "square feet"

So then ,I found the 3M Grey Bumpon SJ5023? which seems the right one and available from Mouser at a good price

Thanks again

Best regards

Eric

?

Re: Damaged HP feet

#148165

Eric,

For this type? of feet - simple rubber blocks - I usually replace all four with generic ones. It's usually possible to find off the shelf ones that match very well, if not perfectly. I've found some that work really well at?places like Anchor Electronics and such.?

Even if you'd find replacement ones in fair condition, they'd still be very old, and aged rubber will not last forever. If removed from an existing unit, I'm not sure how well they'd stick to yours.?

Radu.?

Show quoted text

On Wed, Oct 23, 2024 at 5:33?AM f1ghb via <f1ghb=[email protected]> wrote:

Hello,

?

On small HP power supplies ( E3630A ) I have a problem with the rear bottom rubber feet.

?

With time , they become sticky , see pics with a nice one and three damaged.

?

I am looking for spare feet or at least the HP reference of this type of foot to replace them ( I suppose they are just stuck on the case )

?

The size is 21x21mm H=7mm , I have alreay found some but not with a height of 7mm

?

Best regards

Eric

Damaged HP feet

#148164

Hello,

?

On small HP power supplies ( E3630A ) I have a problem with the rear bottom rubber feet.

?

With time , they become sticky , see pics with a nice one and three damaged.

?

I am looking for spare feet or at least the HP reference of this type of foot to replace them ( I suppose they are just stuck on the case )

?

The size is 21x21mm H=7mm , I have alreay found some but not with a height of 7mm

?

Best regards

Eric

Re: HP 346A Noise Source Below 10 MHz #file-notice

#148163

Arbitrary generator! You could generate any noise distribution you need in python and load it. Very long sequences are possible. Ref. Mersenne Twister and the like.?

Re: HP8555A BAND SWITCHING PROBLEM

#148162

Robert, I was wondering if it was one of those plastics impossible to glue. And, this raccords with your last comment Ed, at work we used a lot of polypropylene because it resists high temperatures and acids. That was polyfused which is exactly autogenous welding. Only with hot air, not flame of course. I thought first of trying that but the risk of my amateurish work destroying the minuscule piece discouraged me!

I also thought of machining one as you mentioned Ed. Still possible.

Thinking of the best course of action now!

Thanks,

Renaud

Re: Agilent Logic Analyzers 90-pin connectors

#148161

I love "Mousikey"

?

Hello Renaud,

?

There's obviously their brothers: Digouser.

?

73,

Christian

?

M. et Mme p'tite'pip ont trois filles :

- Anne

- Justine

- Corinne

Comprendra qui pourra...

Re: HP8753B VNA question regarding if I purchase one

#148160

I don't think comparing the 8753 and nanoVNA can be an "apples-to-apples" situation. The 6GHz 8753 doubles the sweep signal and, presumably, filters it a bit to lower leak-through of the fundamental. The nanoVNA uses the third harmonic (or fifth for higher frequencies) and uses it in the presence of the larger fundamental, which is still there.?

?

On the suggestion of learning to use VNA Cal Kit Manager 2, it does work on both Windows 10 and Windows 11. I have also recently used it on an older computer running Windows XP Service Pack 2. A very good place to start is Dr Kirkby's site? -, .?Lots of good reading to be found there.

Re: 346B verification?

#148159

Hi Dave,

?

Look for this document:

?

Keysight N2002A Noise Source Test Set

?

Chapter 3 has the manual measurement procedure. The instructions are for the NFA, but the concept is the same if you use an 8970. Same formula.

?

Vladan

?

Re: 346B verification?

#148158

开云体育

Vladan,

Do you have a document that flushes this out in more detail.?

Thanks

Dave

VE7HR

Show quoted text

On Oct 22, 2024, at 9:40?PM, pianovt via groups.io <pianovt@...> wrote:

?
Gary, the most hobbyist-friendly approach would be to borrow a noise source with a trusted ENR table and use a noise figure meter to transfer the calibration to your noise source. That's in principle what Keysight does when you send your source in for calibration. There is a little bit of math involved which you can take care of in Excel.

?

Keysight uses a noise figure meter, a noise source they vouch for, and a N2002A test set. They also check return loss before they calibrate the source. The N2002A is not essential, it helps automate the process. It contains some relays, attenuators and isolators.

?

Vladan

?

On Tue, Oct 22, 2024 at 08:03 AM, Gary Hitchner wrote:

Would anybody have a recommendation on where to send a 346B noise source for calibration, or verification?

Generate a new table if necessary.

?

It appears Keysight does still support the 346B, just wondering if there are other options that may be more hobbyist friendly.

Gary

Re: 346B verification?

#148157

Gary, the most hobbyist-friendly approach would be to borrow a noise source with a trusted ENR table and use a noise figure meter to transfer the calibration to your noise source. That's in principle what Keysight does when you send your source in for calibration. There is a little bit of math involved which you can take care of in Excel.

?

Keysight uses a noise figure meter, a noise source they vouch for, and a N2002A test set. They also check return loss before they calibrate the source. The N2002A is not essential, it helps automate the process. It contains some relays, attenuators and isolators.

?

Vladan

?

On Tue, Oct 22, 2024 at 08:03 AM, Gary Hitchner wrote:

Show quoted text

Would anybody have a recommendation on where to send a 346B noise source for calibration, or verification?

Generate a new table if necessary.

?

It appears Keysight does still support the 346B, just wondering if there are other options that may be more hobbyist friendly.

Gary

Re: 346B verification?

#148156

I do have some background information on this topic. George, you are incorrect. The 346 noise sources were designed at HP in Stanford Park (Palo Alto). As far as I know, they have never been made by an outside vendor. The only thing that changed since the original design is the fab that makes the noise diodes. HP obsoleted the Si process in Santa Rosa and started buying diodes from an outside fab. At least some of the founders of that outside fab were former HP employees.

?

The N4000 noise sources were designed at Agilent U.K. in South Queensferry, as were NFA noise figure meters which are based on the E440X ESA economy spectrum analyzers.

?

Noisecom made look-alike noise sources and even called them 346 to leave no doubt about what market they were after. There was another company, now called Noisewave, which made a similar product. I can't recall for sure, but Noisecom may have been started by a Noisewave employee after some disagreements. I also can't remember what Noisewave was called back then.

?

Another manufacturer of noise sources was Ailtech, later part of Eaton, and after that Maury Microwave. Ailtech did not use the 346 designation. The Ailtech sources I opened didn't look anything like HP's. Some of them struck me as hobby projects. I think Maury gave up on noise sources. They now make calibration systems for noise sources.

?

However, I just went to the Maury Microwave site and it appears that Noisecom is now part of them!

?

Vladan

?

Show quoted text

Hi Gary

Noisecom. Inc actually designed and makes the HP346B, HP just re badges it. The Noisecom model number is NC364B.

George G6HIG?

Re: Repairing the Hp 2225a HP-IB InkJet printer

#148155

I bought a broken one to use for parts and one of the things I was
secretly hoping was that the flex circuit would be bad so I would have
the excuse to rip it out and make a set of duplicate gerbers from a
flatbed scan of it.

On Tue, Oct 22, 2024 at 10:56?PM gren via groups.io
<hrgerson@...> wrote:


The Hp 2225a ThinkJet InkJet printers are really very nice, compatible with many Hp instruments and provide easy screen/data printout directly from the instrument, often with the push of just one Hp button on the instrument.

Much criticism of the 2225 has been directed at the "leaking" cartridge & corrosive ink.
-- But really this can be managed by removal of the cartridge (when not printing for long periods of time), storing it in a small
        Rubber  Maid type container, and periodic cleaning of spilled ink.
Otherwise, the Hp ThinkJet technology is superb, and a 1st for Hp of that era (ca. 1984).
( For fun, and amazement, read the Hp Journal May 1985 describing the development of the Hp ThinkJet, and peek at one of the developers stories in Hp Measure magazine, I will dig up that reference later ).

Several frequent breakdown issues occur with the Hp 2225a HP-IB inkjet printer:

A]
The Print Head electrode contacts frequently become corroded due to prolonged contact soaking in the corrosive Ink; where either the contacts themselves become corroded Or the contact-flex cable juncture develops a micro-crack, causing some of the 12 print head "character" nozzles  to not function ( non printing ).

A1]
A repair can be had by following the excellent Repair Log "Fixing the ThinkJet" , by Martin Hepperle, September 2016.
( a .pdf is now in the Hp 2225 File Section herein ). One needs to buy an Hp Q7453a Carriage Assembly to do this.

A2]
Flex head electrode cracks can be repaired with Silver (Ag) paint ( Silberleitlyck 3gm Art No.: 530042 ),
  as described in the below YouTube video
by atkelar:

     { Note this YouTube provides a guide for complete disassembly & reassembly of the 2225a  HP-IB printer }



B]
The Hp 2225 can fail to turn on Or suffer from a Mains power receptacle Rifa-type filter death (or short),
which recently happened to me.  This repair is also covered, and rebuilt, by atkelar, in his YouTube video.

C]
PS recapping.  This also happened to my 2225a printer, & also covered by atkelar.

Note:
  atkelar described using an older NOS 51604a Print cartridge, expired 5 yrs earlier,
printed well, with good results !

TonyG   has provided an excellent alternative Hp 2225a repair with a YouTube video swapping the whole front print section including the Carriage Assembly from a 2225 parts mule:










-- 


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Repairing the Hp 2225a HP-IB InkJet printer

#148154

?

The Hp 2225a ThinkJet InkJet printers are really very nice, compatible with many Hp instruments and provide easy screen/data printout directly from the instrument, often with the push of just one Hp button on the instrument.

?

Much criticism of the 2225 has been directed at the "leaking" cartridge & corrosive ink.

-- But really this can be managed by removal of the cartridge (when not printing for long periods of time), storing it in a small

??????? Rubber? Maid type container, and periodic cleaning of spilled ink.

Otherwise, the Hp ThinkJet technology is superb, and a 1st for Hp of that era (ca. 1984).

( For fun, and amazement, read the Hp Journal May 1985 describing the development of the Hp ThinkJet, and peek at one of the developers stories in Hp Measure magazine, I will dig up that reference later ).

?

Several frequent breakdown issues occur with the Hp 2225a HP-IB inkjet printer:

?

A]

The Print Head electrode contacts frequently become corroded due to prolonged contact soaking in the corrosive Ink; where either the contacts themselves become corroded Or the contact-flex cable juncture develops a micro-crack, causing some of the 12 print head "character" nozzles? to not function ( non printing ).

?

A1]

A repair can be had by following the excellent Repair Log "Fixing the ThinkJet" , by Martin Hepperle, September 2016.

( a .pdf is now in the Hp 2225 File Section herein ). One needs to buy an Hp Q7453a Carriage Assembly to do this.

?

A2]

Flex head electrode cracks can be repaired with Silver (Ag) paint ( Silberleitlyck 3gm Art No.: 530042 ),

? as described in the below YouTube video

by atkelar:

? ? ?{ Note this YouTube provides a guide for complete disassembly & reassembly of the 2225a? HP-IB printer }

https://www.youtube.com/@atkelar

?

B]

The Hp 2225 can fail to turn on Or suffer from a Mains power receptacle Rifa-type filter death (or short),?

which recently happened to me.? This repair is also covered, and rebuilt, by atkelar, in his YouTube video.

?

C]

PS recapping.? This also happened to my 2225a printer, & also covered by atkelar.

?

Note:

? atkelar described using an older NOS 51604a Print cartridge, expired 5 yrs earlier,

printed well, with good results !

?

TonyG?? has provided an excellent alternative Hp 2225a repair with a YouTube video swapping the whole front print section including the Carriage Assembly from a 2225 parts mule:

?

Re: HP8555A BAND SWITCHING PROBLEM

#148153

Forgot to mention - there are small scale plastic thermal welding tools available - like a soldering iron but you fuse the plastic and add molten-in (same type of ) plastic rod material as you go. Typically very ugly, but it works.

?

Ed

Re: HP8555A BAND SWITCHING PROBLEM

#148152

Unfortunately, that's a very high stress zone, so any surface bond on the small cross section that's broken with adhesives or cements probably won't hold for long. Your best bet would be to find someone nearby junking out a 8555A that has the part available. If you want to rebuild it, glue it back together to original shape, then study the mechanics of the pieces and operation, and figure out where you can add reinforcing elements to beef it up in the high stress parts. You can add whatever you want as long as it doesn't interfere with the action.

?

If you have access to machine tools, another option is to build a copy in metal, like zinc alloy (pot metal) or aluminum block. With zinc you can even make a rough casting to start, with fairly simple mini-foundry stuff you can build.

?

I've junked out several 8555As many years ago, so I remember sort of what's inside those lever assemblies, but don't recall if I had saved any of them.

?

Good luck.

?

ED

Re: 346B verification?

#148151

There's some history and info about Noisecom and HP noise sources here:

?

It's all a bit before my time but I think the HP 346 noise sources date back to the 1970s and their older 34x noise sources date back to about the late 1950s.?

?

Re: HP8555A BAND SWITCHING PROBLEM

#148150

A solvent based adhesive like EMA Plastic Weld. This is basically Dichloromethane A.K.A Methylene Chloride.

Avalable from model shops

?

Robert.

Re: HP8555A BAND SWITCHING PROBLEM

#148149

Sorry, not used to those: 141T with 8555A, 8554B, 8553B and ?8552B IF.

Renaud

Re: 346B verification?

#148148

开云体育

Yes, I remember when I was working, the Noisecom sources cost was about 2/3 compared to the HP.? Good quality also.

?

Thanks,

Gary

?

Show quoted text

From: [email protected] <[email protected]> On Behalf Of george edmonds via groups.io
Sent: Tuesday, October 22, 2024 11:31 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 346B verification?

?

Hi Gary

Noisecom. Inc actually designed and makes the HP346B, HP just re badges it. The Noisecom model number is NC364B.

George G6HIG

On Tuesday 22 October 2024 at 16:03:29 BST, Gary Hitchner via groups.io <talgarth@...> wrote:

?

Would anybody have a recommendation on where to send a 346B noise source for calibration, or verification?

Generate a new table if necessary.

?

It appears Keysight does still support the 346B, just wondering if there are other options that may be more hobbyist friendly.

Gary

WA2OMY

Re: 346B verification?

#148147

Hi Gary

Noisecom. Inc actually designed and makes the HP346B, HP just re badges it. The Noisecom model number is NC364B.

George G6HIG

On Tuesday 22 October 2024 at 16:03:29 BST, Gary Hitchner via groups.io <talgarth@...> wrote:

Would anybody have a recommendation on where to send a 346B noise source for calibration, or verification?

Generate a new table if necessary.

?

It appears Keysight does still support the 346B, just wondering if there are other options that may be more hobbyist friendly.

Gary

WA2OMY