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Re: HP141T with multiple sections

 

As I recall, the manual warns that the power supplies may not regulate without plug-ins, but I'm relying on my memory here, and it ain't what it used to be.

Gary Appel

On 12/3/2024 1:22 PM, Don Bitters via groups.io wrote:
You can turn on the 141 display by itself, but will only have a dot display which you can move with the horiz/vert controls. I would not leave it on for any length of time with no plug-ins installed. The plug-ins can be verified to be operable by the set up and operation verifications in the manuals.
In the right hands this is still a usable system. You could sell it (guesstimate 200-600€ for all - if working). It is still pretty repairable, unlike some of the modern test equipment. Local pickup is very much recommended, the total system is not lightweight.
You could donate it to a tech school. If donated to a tech school there are many good articles and app notes still available on usage, theory, and applications.

Don Bitters
Re: Fan replacement 8341B

 

Sunon A1175HBL-T
Re: HP141T with multiple sections

 

You can turn on the 141 display by itself, but will only have a dot display which you can move with the horiz/vert controls. I would not leave it on for any length of time with no plug-ins installed. The plug-ins can be verified to be operable by the set up and operation verifications in the manuals.
In the right hands this is still a usable system. You could sell it (guesstimate 200-600€ for all - if working). It is still pretty repairable, unlike some of the modern test equipment. Local pickup is very much recommended, the total system is not lightweight.
You could donate it to a tech school. If donated to a tech school there are many good articles and app notes still available on usage, theory, and applications.

Don Bitters
Re: Fan replacement 8341B

 

¿ªÔÆÌåÓý

Yes, it is quiet, hard to tell it is on.? I should have noted, I used a fan that has slightly less air flow than the original.? This instrument will be used on the bench, at room temperature, not cabinet mounted.

Spinning the old fan by hand it is easy to hear the worn bearings.

After being on for a while, nothing warm was noted.

One more thing, after removing the covers, and moving it around, the RF gaskets fell? out of the rails in the side covers. Keep track of them, easy to lay down and re-install covers.

?

Gary

?

?

?

?

From: [email protected] <[email protected]> On Behalf Of saevar via groups.io
Sent: Tuesday, December 3, 2024 4:11 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Fan replacement 8341B

?

Good job,

Is it any quieter than the original?

?
Re: Fan replacement 8341B

 

Good job,
Is it any quieter than the original?
?
Re: HP141T with multiple sections

 

This depends on the age of the mainframe, late ones have a interlock connection & relay in the power supply, to prevent operation with no plug-ins fitted.
But for testing something in unknown condition, I prefer to make sure the power supply rails are correct before fitting plug-ins, this also applies to the 18x series mainframes.
?
David
?
On Tue, Dec 3, 2024 at 09:42 AM, tantratron wrote:

My first question: since the HP141T was not run for more than 2 years, is it possible to run the HP141T alone with no section added.
Re: Looking for Noise Source Driver Assembly E4401-60123 for E4407B Spectrum Analyzer

 

I'm afraid I've never looked inside any of the NFA units. They do look like an ESA on the outside but I think the internal signal path will have quite a few changes.
?
The noise figure of the NFA will be about 4dB up to 500 MHz and the ESA will be more like 7dB. So there will be differences in the front end design.
I'd also expect the NFA to have a dedicated noise detector that will have very good linearity. I think that it would also have to have accurate attenuators or at least some way to calibrate the attenuators for accuracy.
?
I tried to find a service manual for the N8973A but had no luck.
?
?
Re: 8350A + 83525A mechanical issues

 

I guess I should say IF there's a battery problem. The message flow is a little confusing to me - not sure about any battery issues.?? Ed
Re: 8350A + 83525A mechanical issues

 

Since you have a battery leakage problem too I'd recommend cleanup, repair, and checkout of proper operation before wrapping up the switch and connector issues. If there's fatal damage from the battery, that changes the picture for the rest. Good luck.
?
Ed
Fan replacement 8341B

 

¿ªÔÆÌåÓý

Posting for information if anybody might be able to use it.

My fan replacement in the 8341B was successful.? The Orion fan number ?OA172SAP-11-3TB is just about an exact replacement. ?Two differences noted.

The fan height is not a issue, the original fan measured about 1.97 ¡°, the Orion fan is 2¡±. ?It fit perfectly.? The grounding screw was a short 10-32, screw.? The new fan has threaded holes for 8-32 and M4, the original wire and lug only fit to the M4 threads on the new fan, you will a M4 screw.? I carefully cut the sleeving and unsoldered the wires to have the original wire length available.

The recommended McMaster Carr filter material also fit perfectly, McMaster number? 2195K305. Cut with scissors and fit into the filter bracket.

Using a small brush and air ?I cleaned dust where I could without disturbing much.?

Synthesizer back on the bench and working.? Looking at the interior of this instrument I wonder how they did that.? Hopefully it will work for a long time.

Thanks for the help,

Gary

WA2OMY

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?

?

?

8341-fan-2.jpg
8341-fan-1.jpg
8341-fan-3.jpg

Re: Shielded probe cables?

 

If you're going to do an adapter, according to the user manual the 5032 has an input resistance of 220k and an input capacitance of 12pF.? You could adjust the 10k termination up a little (10.476k) to give you exactly 10k in parallel to keep the ratio /10.
?
I'm measuring the input capacitance of a 40-pin connector input on an HP analyzer card to be 26pF.? So you might have to add some capacitance to the termination resistance to get the compensation right.? Perhaps start with an adjustable trimmer to find the exact right value with the 5032.
?
-mark
?
?
?
On Mon, Dec 2, 2024 at 06:06 AM, Anders wrote:

It is the 5032, , I was typing from memory and the manufacturer name probably stuck because it is the software I see the most. It has a nice dev kit and I have written decodes for the HP1000 A series memory for a project.
?
You can set custom levels to using cannibalised HP probes might be a good idea. Let me see what I can find.
Re: HP 8341B 1992 firmware version

 

I don¡¯t suppose you¡¯d be willing to write out a copy of the 8.xx image from the device to a floppy and upload it would you? Or if you have files, upload those?
?
I don¡¯t see anything other than the 7.x images in the files section.
Re: 8350A + 83525A mechanical issues

 

Hi Bumbo!
Where are you located?
J.Kruth

In a message dated 12/3/2024 4:25:12 AM Eastern Standard Time, bumbo.chinelo@... writes:
?
Thanks for the feedback
?
Last night I tried the rocker fix. It almost worked, but when I went to put the final turns on the screws the plastic cracked thus I went to the next task, i.e. kicking myself in the ass. The only reliable solution is making a new rocker; will try with a piece of aged walnut wood and this weekend go to a junk yard for a small aluminium block.? Not exactly my piece of cake
?
The N connector seems to be screwed on the frame and it broke the mounting. Once I'm done with the rocker I'll tackle that and might come back for more suggestion
?
The batteries are/were a real bomb. In my 8350 they leaked so much and corroded some tracks This is my first repair of this kind but it has more mechanical tasks than electronic ones
?
Cheers
?
?
?
Re: HP141T with multiple sections

 

¿ªÔÆÌåÓý

Hello,

In France you can place a ad on :



There is one actually for sale - pick-up only - for 400 Euros ( HP141T Mainframe + 8552B , 8553B and 8555A )

Also on :



Best regards
eric

Le 03/12/2024 10:42, tantratron a ¨¦crit?:

Hello, I'm the owner of a HP141T with multiple sections since 2010.
?
From that time, in order to be quick on different projects and testing, I progressively purchased three HP8552B? sections (IF section).?
?
That way, i'd assemble respectively together to ease quick plug and play inside the HP141T chassis:
  • section 8556A (0-30 KHz / 0-300 KHz) with first 8552B
  • section 8553B (0-11 MHz / 0-110 MHz) with second 8552B
  • section 8554B (0-13000 MHz) with third 8552B
I do have one tracking generator 8444A (0.5 - 1300 MHz).
?
During early 2022, I had specific EMC/EMI contract so I've decide to rather go after more recent sprectrum analyzer, Advantest R3361 but kept the HP141T with all its section. At that time, everything was working fine but it has been kept since then in my cellar. For different reasons, I need to make room in my house so do not intend to keep the HP141T suite along some other equipment (i.e. tektronix).
?
My first question: since the HP141T was not run for more than 2 years, is it possible to run the HP141T alone with no section added.
?
My second question: what do you suggest on how to resell these having in mind thet are in mint condition and I'm living in France ?
?
Unless you consider it is really not worth (time, money, logistics) to try resell then only choice would be junkyard.
?
Thank you in advance for any wisdom technical advices and suggestions.
?
Albert
?
Re: HP141T with multiple sections

 

If you need a hand to deliver it to the junk yard ........ /s/s
Re: HP141T with multiple sections

 

Hello Albert,
?
before the junkyard I'd put it on Ebay, 1 Euro starting price, pickup only.
For sure there will be some bids!
?
a+
Martin
?
HP141T with multiple sections

 

Hello, I'm the owner of a HP141T with multiple sections since 2010.
?
From that time, in order to be quick on different projects and testing, I progressively purchased three HP8552B? sections (IF section).?
?
That way, i'd assemble respectively together to ease quick plug and play inside the HP141T chassis:
  • section 8556A (0-30 KHz / 0-300 KHz) with first 8552B
  • section 8553B (0-11 MHz / 0-110 MHz) with second 8552B
  • section 8554B (0-13000 MHz) with third 8552B
I do have one tracking generator 8444A (0.5 - 1300 MHz).
?
During early 2022, I had specific EMC/EMI contract so I've decide to rather go after more recent sprectrum analyzer, Advantest R3361 but kept the HP141T with all its section. At that time, everything was working fine but it has been kept since then in my cellar. For different reasons, I need to make room in my house so do not intend to keep the HP141T suite along some other equipment (i.e. tektronix).
?
My first question: since the HP141T was not run for more than 2 years, is it possible to run the HP141T alone with no section added.
?
My second question: what do you suggest on how to resell these having in mind thet are in mint condition and I'm living in France ?
?
Unless you consider it is really not worth (time, money, logistics) to try resell then only choice would be junkyard.
?
Thank you in advance for any wisdom technical advices and suggestions.
?
Albert
?
Re: 8350A + 83525A mechanical issues

 

Thanks for the feedback
?
Last night I tried the rocker fix. It almost worked, but when I went to put the final turns on the screws the plastic cracked thus I went to the next task, i.e. kicking myself in the ass. The only reliable solution is making a new rocker; will try with a piece of aged walnut wood and this weekend go to a junk yard for a small aluminium block.? Not exactly my piece of cake
?
The N connector seems to be screwed on the frame and it broke the mounting. Once I'm done with the rocker I'll tackle that and might come back for more suggestion
?
The batteries are/were a real bomb. In my 8350 they leaked so much and corroded some tracks This is my first repair of this kind but it has more mechanical tasks than electronic ones
?
Cheers
?
?
?
Re: Looking for Noise Source Driver Assembly E4401-60123 for E4407B Spectrum Analyzer

 

Thanks for the PDF, very interesting reading.

Do you know what is the difference between the NFA and the ESA? I
thought the NFA is just an ESA with the Option 219 card installed and
the 2 ports routed to the front panel.

I searched on Google images to see some pictures with the NFA hardware
shown on the display and I saw they have different boards (part numbers)
installed compared to ESA. I guess it is not just the E4401-60123 board
installed.

I couldn't find any pictures with the NFA hardware to see how it looks
inside.

On 02/12/2024 22:21, jmr via groups.io wrote:
The E444xA does have the 110 option for a 50 GHz preamp but the noise
figure (and presumably also the input VSWR) of the preamp limits the
performance across the upper parts of the frequency range.
The older version of the 5989-5065EN noise figure selection document can
be found here:
5989-8056EN-05-5-10.indd <
an/5989-8056EN.pdf>
This includes graphs for the ESA and the 8970B.
I think the reason the ESA and 8970B aren't listed in the later version
of the above document is that they are now classed as obsolete. So is
the E444xA analyser.
Re: Looking for Noise Source Driver Assembly E4401-60123 for E4407B Spectrum Analyzer

 

Hi,
?
there is a similar graph of uncertainties, but with VERY different axis scales, in 5989-8056EN dated May 12 2008. It also shows that the NF option for the ESA analyzers to be less than wonderful.??
?
https://assets.testequity.com/te1/Documents/pdf/noise_figure_selection.pdf
?
?
regards
Charles Edmonds
VK3CLE
3201 - 3220 of 151544