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Re: 3458A Schaffner Mains Filter

 

I have just had two blow-ups in an 8514 and in an 8515. Nasty stink!
Does anyone know where to obtain replacements for the Schaffner mains sockets that mechanically fit?
The ones I see here in Europe are all too long. The chassis of the 851x is in the way.

Tom
Re: 3458A Schaffner Mains Filter

 

"Carsten Bormann" <cabocabo@...> writes:

But if you need to replace them, getting a new line filter is a bit less of a waste of time.
If you try to repair the line filter: Definitely do *not* get a replacement cap that is again a clear blob of hard epoxy; these will fail the same way some 20, 30 years from now. Best get one with a plastic cup and some more ductile plastic filling covering the capacitor coil.
Kemet still sells metallized paper (MP) caps that appear to use the same
epoxy coating. Do we know that modern Schaffner filters have opted for
the film caps over the MP versions? Has anyone opened these up?

Also, how simple is it to open up the line filter and just replace the
caps?

Matt
Re: 3458A Schaffner Mains Filter

 

Let's be fair here, if we can...

Where an X or Y cap has a rating, that is the nominal
working voltage for the cap. The safety margin is already
cooked into the rated working voltage.

So, an X or Y cap may say 250VAC, but it is really a
much higher voltage capacitor. It is sized appropriately
to operate on a 250VAC power main.

Schaffner caps were perfectly fine when they were new, and
perfectly fine when they were quite old. But at some point
after being quite old, they failed. In droves...

The failure has nothing to do with the environment, but
rather everything to do with the epoxy used to mold the
body of the cap. Epoxy is a confused tangle of bonds that
get created as the chemicals in its mix combine. Epoxy
used to pot X or Y caps contains fillers and fire retardant
additives.

If the engineer/chemist that designed the epoxy mixture
guessed wrongly, the epoxy he designed will shrink for the
rest of time. Eventually, the tension will get so high that
the epoxy bonds break, the plastic cracks, and moisture can
get into the paper dielectric capacitor.

All paper dielectric capacitors will fail eventually if
moisture is allowed to infiltrate the paper.

-Chuck Harris


On Fri, 9 Sep 2022 14:50:38 +0000 (UTC) "dbztuzujdhgtrjzthxh via
groups.io" <dbztuzujdhgtrjzthxh@...> wrote:
I thoroughly support replacing these filters on sight.The first of
mine that failed - it took weeks to get the smell out of the
house.The caps are only rated 250V which is ok on 110V, but no margin
when used in the rest of the world.

This doc shows what is inside and how to rebuild if you can't find a
suitable replacement www.n4iqt.com/solartron/solartron-repair.pdf
Re: 3458A Schaffner Mains Filter

 

On 2022-09-09, at 16:50, dbztuzujdhgtrjzthxh via groups.io <dbztuzujdhgtrjzthxh@...> wrote:

I thoroughly support replacing these filters on sight.
The first of mine that failed - it took weeks to get the smell out of the house.
Yes. And I still have tar marks on some furniture that was subjected to the jet of molten (vaporized?) tar coming out of the 3457A. Fortunately, that furniture was hard to set on fire.

The caps are only rated 250V which is ok on 110V, but no margin when used in the rest of the world.
That is a common misunderstanding of the problem.

These caps were rated for 250 V because they were designed and intended be used on 250 V mains. (250 V is the working voltage rating, not the voltage at which they start to fail ¡ª there is *plenty* of margin.)

It just turned out that the manufacturing process didn¡¯t actually serve to protect the innards from moisture ingress in the long run, which eventually causes the caps to degrade well below their rating.
The failure then indeed happens earlier (and is more catastrophic) in 230-V-land than in 110-V-land, but the failure is the same.

Depending on climate, moisture ingress is less heavy when the device is powered (warmer than the room) continuously. Then when it is decommissioned, put into storage, and ultimately sold on ebay, the problem hits.

This doc shows what is inside and how to rebuild if you can't find a suitable replacement

www.n4iqt.com/solartron/solartron-repair.pdf
These are great images to learn more about these line filters.
But if you need to replace them, getting a new line filter is a bit less of a waste of time.
If you try to repair the line filter: Definitely do *not* get a replacement cap that is again a clear blob of hard epoxy; these will fail the same way some 20, 30 years from now. Best get one with a plastic cup and some more ductile plastic filling covering the capacitor coil.

Gr¨¹?e, Carsten
Re: HP 3580A Spectrum Analyzer - broken frequency display

 

Hi Peter,
with the extra aid of some warm air, I succeeded in releasing the bezel.
Accordingly, I could inspect my broken display with a microscope and I found a detached filament inside.

In your video you mentioned KCSC02-105 display as a replacement, am I right?
Farnell sells these components.
?
Private Messaging is not working on my side and I can't send my address to you.
I'll try again tomorrow.
?
Bye
Re: 3458A Schaffner Mains Filter

 

I thoroughly support replacing these filters on sight.
The first of mine that failed - it took weeks to get the smell out of the house.
The caps are only rated 250V which is ok on 110V, but no margin when used in the rest of the world.

This doc shows what is inside and how to rebuild if you can't find a suitable replacement
Re: HP Semiconductor Analyzers

 

Am 09.09.2022 um 08:27 schrieb Sven Schnelle:

Thanks, but i already ordered a HxC emulator to replace the floppy
drive. I don't even know whether the floppy drive does even work. Were
Is this one of the Sony MP-F52W drives too? I (now) know how to emulate them properly with a Gotek hardware, FlashFloppy software and HFE file. Had to dig a little bit to get all pieces working, the disk change reset is a little tricky (and does not work on all versions of Gotek hardware).

Bernd
Re: FS: (US) HP 83525A and 83522A RF Plug-ins for 8350A/B Sweep Generator

 

Reminder, the HP 83525A (0.01 to 8.4 GHz) is still available and ready to ship.

Details here:

Price reduced, asking US$300
Re: Hp 8590a eeprom problem.

Richard Cook
 

I reflowed the pins yesterday on U21 but the error message didn't come up till after 30 mins of operation. . I have read that one guy didn't get the same error code till he did amplitude cal. I also did another cal yesterday . Maybe I need exactly what I do and when it rears its ugly head again. I'm beginning to suspect something other than EEPROM issue. What do you all think ??
Re: OT - AN/PRM-10 Numbers on name plate

 

¿ªÔÆÌåÓý

The 11-digit number is the federal stock number (a predecessor to the NSN; insert "00" between the first and second groups of digits to form the corresponding NSN). Looking it up leads, among other places, to:



Perhaps that will lead to more of what you're looking for.

-- Cheers,
Tom
-- 
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070

From: [email protected] <[email protected]> On Behalf Of Stefan
Sent: 09 September 2022 09:18
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] OT - AN/PRM-10 Numbers on name plate

?

Hello all,

I recently acquired a military AN/PRM-10 Test Oscillator (dip meter).?There are some inscriptions on the nameplate that I don't understand and?couldn't find on the web.

Does anyone know the meaning of those strings:

?6625 - 339 - 2046

?AF 36(600)19312 [Air Force?]

?PT. NO. 483B2000 [Part Number?]

?MFG. 06728 [Manufacturer?]

?
Re: OT - AN/PRM-10 Numbers on name plate

 

¿ªÔÆÌåÓý

The first number will be a NATO Stock Number (NSN) there are published lists of these which wil lgive more details and the manufacturers name etc.

?

Hope it helps¡­

?

Just V busy now and haven¡¯t time to look further.

Regards

Nigel

?

From: [email protected] <[email protected]> On Behalf Of Stefan
Sent: 09 September 2022 09:18
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] OT - AN/PRM-10 Numbers on name plate

?

Hello all,

I recently acquired a military AN/PRM-10 Test Oscillator (dip meter).?There are some inscriptions on the nameplate that I don't understand and?couldn't find on the web.

Does anyone know the meaning of those strings:

?6625 - 339 - 2046

?AF 36(600)19312 [Air Force?]

?PT. NO. 483B2000 [Part Number?]

?MFG. 06728 [Manufacturer?]

?

Thank you,

Stefan
OT - AN/PRM-10 Numbers on name plate

 

Hello all,
I recently acquired a military AN/PRM-10 Test Oscillator (dip meter).?There are some inscriptions on the nameplate that I don't understand and?couldn't find on the web.
Does anyone know the meaning of those strings:
?6625 - 339 - 2046
?AF 36(600)19312 [Air Force?]
?PT. NO. 483B2000 [Part Number?]
?MFG. 06728 [Manufacturer?]
?
Thank you,
Stefan



AN-PRM-10 b.jpg

Re: HP Semiconductor Analyzers

 

Am 09.09.2022 um 01:55 schrieb Jared Cabot via groups.io:
I have a spare boot floppy for the 4145A, can make a copy on a new floppy disk for the 4145B, and have a set of Agilent floppies in a sealed box for the 4155B/4156B (Kit# 04155-85022, containing P/N: 04155-17001, 04155-17004, 04155-17401, and E5250-17001)

I'm able to take images of these disks if you like (not the 4145A disk yet, still working on getting the 5.25 floppy drive operational) and email them, or sell the physical disks for the cost of shipping plus what I paid for them (a nominal amount).

Would be nice if you can upload those images to one of the usual sites (KO4BB?) For the 4145B disks already are at KO4BB.


Bernd
Re: HP Semiconductor Analyzers

 

"Jared Cabot via groups.io" <jaredcabot@...>
writes:

I have a spare boot floppy for the 4145A, can make a copy on a new
floppy disk for the 4145B, and have a set of Agilent
floppies in a sealed box for the 4155B/4156B (Kit# 04155-85022,
containing P/N: 04155-17001, 04155-17004, 04155-17401,
and E5250-17001)

I'm able to take images of these disks if you like (not the 4145A disk
yet, still working on getting the 5.25 floppy
drive operational) and email them, or sell the physical disks for the
cost of shipping plus what I paid for them (a
nominal amount).
Thanks, but i already ordered a HxC emulator to replace the floppy
drive. I don't even know whether the floppy drive does even work. Were
are you located? I guess if it's US shipping to EU is likely as much as
the HxC ;-)

Regarding the image itself, couldn't you just convert the HxC emulator
images that are out there?
Re: HP Semiconductor Analyzers

 

"Jared Cabot via groups.io" <jaredcabot@...>
writes:

On Fri, Sep 9, 2022 at 05:40 AM, Sergey Kubushyn wrote:

Most common failure in 1345 is one (or more) of the trimpots lost
connection in one of terminals. Those small Bourns round trimpots are a real
disaster. I had at least a couple of dozens of those replaced in all kinds of
HP and Tektronix gear and that was the only parts failed. That included 3 or
so 1345 displays.
I found the same in the 1345 displays in both my 4145A and 4145B, more
than one of those little Bourns 3329-series
trimpots were problematic.
The interesting thing was that it wasn't even noticable when turning the
pot. It was just open when the unit was cold, and after it warmed up,
everything was fine. I just suspected the pot because during after some
warmup time the width of the picture changed in a 'flickering' way until
it finally worked ok.
Read frequency list from HP 8510C via HP-IB

 

Hi

I'm trying to read the list of stepped frequency points for the current
(corrected) trace on an HP 8510C via HP-IB. I *think* OUTPFREL is
supposed to accomplish this, but I see the message:

CAUTION: REQUESTED DATA NOT CURRENTLY AVAILABLE

The manual says this about that error message:

You tried to input/output raw data arrays that were not available due to
the calibration type, or tried to input calibration coefficients without
selecting the proper calibration type (see INPURAW, OUTPRAW), or tried
to output a memory trace without turning on memory.

Only the last option there seems like it could be applicable. What does
"tried to output a memory trace without turning on memory" mean?

FYI I'm able to read out the corrected trace data just fine with
OUTPDATA (I've set the format to ASCII = FORM4).

How can I read out the frequency stimulus points?

Thanks in advance,
Matt
Re: HP 3580A Spectrum Analyzer - broken frequency display

 

Hi Marco,
The scope bezel does come off, but because of age the plastic will have become brittle, so you do have to be careful. There are two tabs on the bezel which lock it into a metal surround on the front panel.?
These tabs are hidden but are located, one on the top and the other on the bottom in the center of the bezel. If you use your thumb and middle finger of one hand to grip the top corners of the bezel, ready to pull it forward when the top tab is released, then with your other thumb press down on the center of the bezel near the rear edge. This should release the top part of the bezel from the instrument.

As for the board it is small enough to be sent in a letter so the postage should not be expensive. This is just a blank board, no parts included. The seven segment displays I used are available from RS Components, E14/Farnell, Digikey, and Mouser.
As for the right-angle header the pins are longer those currently available, so I just reused the one from the original display board.

Let me know you mailing address and I'll send the board.

Regards,
Peter
70427A, or 70428A, or 71707A, or 717108A, or N5507A service information?

 

Does anyone have access to service information and/or schematics for any of these microwave sources and down-converters?
As far as I can tell HP/Agilent never released any service info on any of these fine instruments. Thank you.
Re: HP Semiconductor Analyzers

 

On Fri, Sep 9, 2022 at 05:40 AM, Sergey Kubushyn wrote:
Most common failure in 1345 is one (or more) of the trimpots lost connection
in one of terminals. Those small Bourns round trimpots are a real disaster.
I had at least a couple of dozens of those replaced in all kinds of HP and
Tektronix gear and that was the only parts failed. That included 3 or so
1345 displays.

---
*
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
*
I found the same in the 1345 displays in both my 4145A and 4145B, more than one of those little Bourns 3329-series trimpots were problematic.

Jared
Re: HP Semiconductor Analyzers

 

I have a spare boot floppy for the 4145A, can make a copy on a new floppy disk for the 4145B, and have a set of Agilent floppies in a sealed box for the 4155B/4156B (Kit# 04155-85022, containing P/N: 04155-17001, 04155-17004, 04155-17401, and E5250-17001)

I'm able to take images of these disks if you like (not the 4145A disk yet, still working on getting the 5.25 floppy drive operational) and email them, or sell the physical disks for the cost of shipping plus what I paid for them (a nominal amount).


Regards,
Jared
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