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FS 8660 plug in's

 

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List,? FS -

Three plug in’s ?used in 8660’s.

2)- 86603A ?one has phase modulation capability.? These are the high frequency units that go to 2600 MHz.

1)- 86633B, ?Modulation plug in.?

These plug in’s were all in use and working about a year ago when the 8660;s were retired, maybe one has a bad attenuator step.

Sold as is, but as pictured and complete,?? $150.00 for all three shipped to your door, US only, L48.

Gary

WA2OMY
Re: E4402B SA power problem - need DC socket connections

 

The other area of the PSU to look at is standby power and startup circuit. In the older 859x series there is a Schottky diode HSMS-2800 that goes leaky. It's function is to rectify the output from a low current oscillator to generate a pull up voltage for the turn on signal. If it drops too low, the PSU shuts down. Higher temperatures increase leakage, which could cause these symptoms.

I don't know how relevant they are, but I posted traced schematics of the 8591E PSU to the files section a few weeks ago.

Chris G4MWQ

On Mon, 24 Mar 2025, 16:53 Jeremy Owen via , <jezzer3=[email protected]> wrote:
Well, well, well!? I put 12V on the DC connector and removed the mains and the SA fired up.? about 12V at the plug at 7A when running, from a commercial switchmode 13.8V psu.
And it stayed fired up for 3 hours until I got bored and turned it off.? The display was perfect, no error messages, doing exactly what I expected, which was nice.
This means that the fault must lie in the very first stage of the PSU, where the ac is rectified and down-converted to 15V or so.
Maybe dried-out main reservoir caps giving excessive ripple. or rectifier(s).
I've got other things to attend to now but will get back to this in a week and get the PSU out and some caps changed.
I also used the EEVBlog mechanism to install a narrow bandwidth option "upgrade" and it works beautifully!
Good result all round for now.?
Thanks for the help.
-Jeremy
?
Re: E4402B SA power problem - need DC socket connections

 

That's good news.
?
Robert.
Re: E4402B SA power problem - need DC socket connections

 

Well, well, well!? I put 12V on the DC connector and removed the mains and the SA fired up.? about 12V at the plug at 7A when running, from a commercial switchmode 13.8V psu.
And it stayed fired up for 3 hours until I got bored and turned it off.? The display was perfect, no error messages, doing exactly what I expected, which was nice.
This means that the fault must lie in the very first stage of the PSU, where the ac is rectified and down-converted to 15V or so.
Maybe dried-out main reservoir caps giving excessive ripple. or rectifier(s).
I've got other things to attend to now but will get back to this in a week and get the PSU out and some caps changed.
I also used the EEVBlog mechanism to install a narrow bandwidth option "upgrade" and it works beautifully!
Good result all round for now.?
Thanks for the help.
-Jeremy
?
Re: 89605 / 89606 cal file

 

Hi Ed,
?
Here are 3 text files from separate serial number 89605A/B units.? I don't think I have any 606 cal files.? Would be happy to collaborate to set up a test procedure to build cal files for these, as I have several.
?
Adam

89605A_US40240223.cal.txt
89605A_US40240223.cal.txt
89605B_US43180383.cal.txt
89605B_US43180383.cal.txt
89605B_US43180546.cal.txt
89605B_US43180546.cal.txt

Intermittent REF UNLOCK error message on 8591A Spectrum Analyzer

 

I have just bought an 8591A that has an intermittent REF UNLOCK error message when I use the internal 10 MHz reference. The error comes every 0,5 to 10 second.
The internal reference is 10,000 MHz and the amplitude is around 350 mV peak to peak. The waveform is a bit distorted - not a clean sinus wave.?
The error REF UNLOCK disappears if I connect an external 10 MHz reference - If the amplitude is exactly 130 mV peak to peak.
If the amplitude is higher than 140 mV peak to peak, the intermittent error REF UNLOCK comes back.
Also if the external reference is adjusted lower than 9,98 MHz or higher than 10,02 MHz the error REF UNLOCK disappears even if the amplitude is higher than 140 mV peak to peak.
My 8591A has serial number 3122U01724 and software revision 7.5.91.
?
I have checked the Service Manual but it does unfortunately not contain any drawings of the A25 Counter Lock Assembly.
I am very grateful if anybody has any suggestions!
Re: E4402B SA power problem - need DC socket connections

 

Thanks Robert.? That ties up with about 16.5V to chassis measured on that top pin.? The bottom pin seems to float.
I'll try it on DC and see if that makes any difference.? I think that there's some logic or a microprocessor in there that organises shutdown.
But I'm resigned to a shotgun cap change as this is a really lovely SA in excellent condition and I would like to get more use out of it!
I suspect that it's one of the caps round the startup/shutdown circuitry, but a refresh of a batch of caps may just sort it out.
Thanks for the clear plug info.
BTW does anyone know the correct manufacturer's plug type to match that socket for DC in?? I get lost in the Molex catralogue looking for things like that, and none of my stocks of connector parts matches it.
-Jeremy
How to I disassemble the HP/Agilent 8495B attenuator ?

 

Hello,
?
I need to disassemble ?the HP/Agilent 8495B ?attenuator, there are no visible screws, how can I do it if I need to service the attenuator ?
?
Thanks in advance!
Re: microscope / high magnification camera options for soldering, faults, and other examinations/inspections

 

Hi Steve,
Thanks for that advice. Why are 145 eyepieces better please? It seems 147 are very common.
Best regards,
Renaud
Re: microscope / high magnification camera options for soldering, faults, and other examinations/inspections

 

Inasmuch as this is a vintage equipment group you might consider an American Optical AO570 with the model 145 eyepieces for about $100 on eBay. I can attest to the superb optics, with magnification from 7x to 40x. Illuminators are available for another $30-50. You do have to familiarize yourself with the models, various bases available and the eyepieces. I got an AO570 wit the wrong eyepieces included but got a correct pair model 145 separately. Gorgeous stereo view. The AO569 is a little cheaper but the optics have marginally less resolution. I’m happy I got the model 570.
An Interesting find: HP Strobeline Demonstrator

 

I recently purchased this rare HP item off of eBay. It appears to be a trade show demonstration unit for selling HP's alphanumeric LED display modules. It is from 1970 (based on the date codes of the parts) and is made to a very high standard. As received it needed a very good cleaning to remove "residue of rodents" but once cleaned seemed to basically work without any repairs. The only remaining problem is a worn-out "DATA ENTER" switch but I found an exact replacement on eBay and will get that going as soon as the part arrives.
?
This same unit is on page 3 of the July 1970 HP Journal () and the corresponding article describes it in pretty good detail, although without schematics. All the ICs appear standard except for a mask ROM, and, of course, the HP display module itself.

I am posting this here to document this rare item's existence and in the hopes that a former HP employee may be able to provide some more information on it.
?
?
Re: Keysight 33522a Binary Arb Files

 

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Hi Alex,

?

I used a demo version of Benchlink 33503A Pro to create triangle wave files in *.wvf, *.arb, and *.barb formats.

?

For the 33522A, the waveform will appear on both channels simultaneously.

?

Yves

?

De?: [email protected] <[email protected]> De la part de TomS via groups.io
贰苍惫辞测é?: 23 mars 2025 04:19
??: [email protected]
Objet?: Re: [HP-Agilent-Keysight-equipment] Keysight 23522a Binary Arb Files

?

Hey Yves,

I found a threat for a 33210 where you created a testfie for a User. Is IT possible that you create a small barb File with all possible Parameters for my 33522a?

Thanks in advance Alex

Triangle_33522A.barb
Triangle_33522A.barb
Triangle_33522A.arb
Triangle_33522A.arb
Triangle_33522A.wvf
Triangle_33522A.wvf
Triangle_33521A.wvf
Triangle_33521A.wvf
Triangle_33521A.arb
Triangle_33521A.arb
Triangle_33521A.barb
Triangle_33521A.barb

HP 10248 series data probe IC part number

 

Does anyone have handy the HP part number on the interface IC used in the 10248 series of logic analyzer data probes? The manual on the probe has all part numbers listed except for the IC that is part of the PWB assembly. I once came across a HP part number 1820-0919 that was believed to be the number but it crosses to a Motorola MC1650L which is a dual A/D converter, an obviously wrong part. Thanks, Greg
Re: E4421B Display Sorted

 

I'm glad you solved the problem and that I was at least a little bit helpful!
Milan

On Sun, 23 Mar 2025, 16:06 geoffrey pike via , <gi0gdp=[email protected]> wrote:
About a year ago one of my E4421B signal generators developed a display contrast problem. I left it for a while and then decided to see what info i could find about the problem.
After a while i decided i needed the services of Milan for the CLIP details, this was neatly done (thanks Milan). This info also was left for a while and then i finally took the cover off to see what was happening. As previously reported Q601 had an open BE junction. Mmm strange. But prior to this i measured some weird voltages on the LT1170 regulator and even worse an unusual to me configuration, the ground tab is connected to the 1mH switching inductor.
So i confirmed the DAC was supplying a 0 to -10V control signal from the front panel-good but the output from the TL074 was jumpy as was the output from the LT1170 regulator with supplies of up to -46V being measured.
Q601 was replaced (not the best thing to do) and the display was back for a minute and then it all went wrong again. Working at the LT1170 was not easy due space and depth issues so i rebuilt the supply on stripboard to emulate the problem. So i couldn't get these weird varying voltages even thought the control signal was fine. Almost there so it was the Schottky diode CR607 that was the culprit.
The excess voltages explains the demise of Q601, C651 the 47 uf output capacitor was also replaced. I would suggest to any one with this problem to immediately connect a 24V zener across R625 the 2 watt 1K5 resistor and remove the 15 way flat ribbon going to the display? to avoid damaging it whilst affecting repairs as $350 is a high price for a new one
cheers
Geoff
GI0GDP
8660 extension cables

 

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HP list, the extension cables have been sold,

Thanks for the responses,

Gary

WA2OMY

?
E4421B Display Sorted

 

About a year ago one of my E4421B signal generators developed a display contrast problem. I left it for a while and then decided to see what info i could find about the problem.
After a while i decided i needed the services of Milan for the CLIP details, this was neatly done (thanks Milan). This info also was left for a while and then i finally took the cover off to see what was happening. As previously reported Q601 had an open BE junction. Mmm strange. But prior to this i measured some weird voltages on the LT1170 regulator and even worse an unusual to me configuration, the ground tab is connected to the 1mH switching inductor.
So i confirmed the DAC was supplying a 0 to -10V control signal from the front panel-good but the output from the TL074 was jumpy as was the output from the LT1170 regulator with supplies of up to -46V being measured.
Q601 was replaced (not the best thing to do) and the display was back for a minute and then it all went wrong again. Working at the LT1170 was not easy due space and depth issues so i rebuilt the supply on stripboard to emulate the problem. So i couldn't get these weird varying voltages even thought the control signal was fine. Almost there so it was the Schottky diode CR607 that was the culprit.
The excess voltages explains the demise of Q601, C651 the 47 uf output capacitor was also replaced. I would suggest to any one with this problem to immediately connect a 24V zener across R625 the 2 watt 1K5 resistor and remove the 15 way flat ribbon going to the display? to avoid damaging it whilst affecting repairs as $350 is a high price for a new one
cheers
Geoff
GI0GDP
Re: FS 11672A 8660 extension cable kit

 

Gary,
?
I will take the extender cable kit. Let me know how you to complete.
?
Thanks,
Russ
WA7MLW
?
Re: Keysight 23522a Binary Arb Files

 

Hey Yves,
I found a threat for a 33210 where you created a testfie for a User. Is IT possible that you create a small barb File with all possible Parameters for my 33522a?
Thanks in advance Alex
89605 / 89606 cal file

 

Would anyone have an example cal file they can share? I’d like to create one for my hardware
Re: Cleaning N-tyoe cal kit

 

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If you manage to separate the metallic parts form dielectrics , it is possible on older connectors. I recommend a solution of boiling water and sodium bicarbonate to clean the parts the process can take a couple of hours. Sodium bicarbonate is a known antiacid and its easy to get . It reverts the corrosion and is the best to save gold plated surfaces. Of coarse you can rework the surfaces with electroplating.?
Ing. Patricio A. Greco
Taller Aeronáutico de Reparación 1B-349
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Gral. Martín Rodríguez 2159
San Miguel (1663)
Buenos Aires
T:?+5411-4455-2557
F:?+5411-4032-0072

On 22 Mar 2025, at 22:23, Robert G8RPI via groups.io <robert8rpi@...> wrote:

?
After lots of trials with several solvents over the years I've found the best solvent for decayed PU foam is 99% methanol.
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