Anyone happen to have those files? I have the disassemblers for HPIB and other stuff, but not HP1000. Docs for the two breakout boards would be nice as well!

I had been seeing some phase jumps from my DMTD and after swapping out both the DMTD and the 7350A, I had come to the conclusion that it was probably the 3335A.? I had started another 24 hour run, and the outputs to the 5370A stopped cycling.? Then I noticed the display panel on the 3335A flashing nonsense.? So, after pulling the 3335A apart, I found that U3 on the pass-transistor board must have conducted at high gain for some reason, as J2 pin 5 on the A15 board (pass transistor board) was charred clear through the board.? The back of the board is very dark under U3, as well.? And yet, diode tests on the darlington with a DVM don't look bad.? Other than the burned PCB the only anomaly I've found so far is that this darlington transistor has been previously replaced with an NTE-247.? The other +V darlington has the number PMD12K60 on the case.? The big electrolytics test OK on my little multi-tester, both for capacitance and ESR.

So, before I go any further, I thought I'd ask the group if anyone had run into this type of failure before?? I was thinking of looking at the opamps on A14 next.

Bob - AE6RV

Brad,

?

If I can recall the neon-photocell approach was very similar to that used in the HP 5245L counter series display boards.? If you can find an old board (base P/N 05212-6016) you might have some luck in finding similar photocell devices.? The suffix to the part number (“Series 6xx”) changed reflecting the board functionality.? There was also changes in the design of these boards where they either contained an enclosed module termed “Decoder” (One HP part number is 1820-1683”)? or a “Photoconductor Plate” where the photocells directly drive the Nixie tubes.

?

It appears that HP changed to the “Decoder” module in later model counters.? It is a black plastic enclosure on the board with a removable cover but I have never opened one up to see what is inside.? Given its construction I am assuming that it, too contains photocells.

?

Greg

Don -
Thanks - that is what I thought.

Cheers!

Bruce

Quoting "Don Bitters via groups.io" <donbitters@...>:

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Guys I have a HP 8656B that has a lot digit on the display that remains on all the time.?

Example: 10.000 MHz reads ? ? ?.10.000 MHZ?

not sure if it may be a stuck something??

Andrew

Hi all
Regarding Yig information and a X reference look in the Yig folder on this site

/g/HP-Agilent-Keysight-equipment/files/YIG%20%20folder

Hello again Candrian.

Sadly I do not know enough about those hardware options, to say for sure.? But if I had to recommend anything, I'd go for the HPIB(GPIB) interface designed for that analyser, if you can find one, and one of the common USB(or LAN) to GPIB adapters/controllers, there are several to choose from.

If your PC OS is Windows, go for the National Instruments device, and companion drivers.? Very well known, and works very well.
(NOTE!? NI are changing how they support "non current" products, so take care with them.)
Many people like NI's LabView (not me personally) and there is a lot of third party software out there that expects to use a NI interface.?? ? for one.

Or, the HP/Agilent equivalent, but using it's own native software (HP VEE) and drivers.? They might "Look" similar, and perform the same functions.? But, you CANNOT use NI drivers with the Agilent device, or the other way round.

If you use Linux in any flavour, there are ways to graft in the kernel needs for the NI devices, and there is some good code around using Python (in one form or another) to get work done.? The fun bit, is getting the OS to recognise and load drivers for the device itself.? It has even been done on a Raspberry Pi!

Then there are the Prologix devices (or the many look-alikes) as they don't actually have installable "drivers" as such, they appear to the OS as either a virtual serial port (USB connected types) or an address on your home/workshop LAN.
There are many DIY versions of the former, for example the AR488 Arduino based project.? For most people, they work well enough. Just don't expect to get anywhere close to the fabled 1 Mega Byte a second transfer rate, even if your instrument could do that.

The LAN connected GPIB adapters are possibly the most flexible. Both need some software skill's to deploy and make work, though lots of other people have done it.?? The LAN type's, of course can be used by any PC on your LAN if you need (but generally NOT at the same time!)? Of course, if you don't have a wired LAN, not a lot of use without some more kit.? (There are ways, but...)

If you have one instrument only, they are fairly easy to use.? If you have multiple that you need to use together to form a system, there is some more software work to do, to point the controller at the instrument you want to exchange data with.? Some of the documentation is a bit vague on that subject!

If you are not already, you WILL become fluent in whatever programming language you end up using, as well as "GPIB speek". Creating a system to do a job, and making it all work as you wish/need, is very satisfying.? But oh so frustrating at times! Don't assume all instrument (or software) documentation is 100% accurate either!? Also use good quality GPIB/HPIB cables, and take care of them.? (Personal experience from 30 odd years working with GPIB instruments etc for work...)

As we say, "The Devil is in the Detail"?? And there are lots of small details that you have to get correct for things to work.? Any one wrong, and often, nothing will work, or you get bad data or weird instrument behaviour!

(Hint:? ALWAYS check the error flags and status words!? And handle such errors, even if that is just to stop execution of your software, but put a meaningful message up for the luckless user when that happens! ...)

Above all, have fun!.? Instrument control over any interface, can be a deep rabbit hole to get lost in!

??? Dave G8KBV

--
Created on and sent from a Unix like PC running and using free and open source software:

Most of your assumptions are true, but if the end point voltages are not reasonably close you won’t see output at either end. You might find that if you supplied a tuning voltage to the YIG somewhere in the middle of its tuning range you would possible find output from the YIG but off in frequency by as much as 1GHz or more. If the endpoints are not close and beyond the tune range of the YIG +/-, there will be little to no output from the YIG. Many of HP YIG choice were either 3Vdc/GHz tune voltage, there is also another spec. of mA/GHz, but I cannot recall that now. There also exist 1Vdc/GHz tuning voltage YIG’s.
Don Bitters

Recently I've resolved the burnt T1 transformer issue on the mainframe. You can see that in my older 8350B post. I think the mainframe is now ok, but the definitive confirmation is try to operate a healthy plugin. I've already think on that, Paul.?

Until that happens, I think I will do the tracking generator conversion, Don't need 20 gig sig gen in a hurry, I've already have a trusty (and hacked) 8341A. So TG for the moment, later on a healthy plugin to test the proper operation of the mainframe and then I'll do more study on the YO and the other acronyms present in the war.

Regards,
Ruben

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For that generation of instrument, my first guess would be CdS. These are light-controlled resistors, so photodiodes/phototransistors would not be acceptable subs in most cases.

-- Cheers
Tom
(btw, it's silicon, not silicone. Just remember "silicon valley" is for chips, "silicone valley" is Hollywood)

-- 
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070

On Wed, Mar 15, 2023 at 06:05 AM, Dave_G0WBX wrote:

Set the PC up so that RealTerm just dumps what comes in to the screen.? 9600, n, 8, 1 should be a good start.

Hi,

I just tried the COPY button and I received a bunch of characters on my RealTerm . So it seems you are right Dave maybe option 023 is only for outgoing messages and no option for remote controlling the device. Do you know if i can install option 043? Is there a card that i can plug in and upgrade the scope for remote controlling??

Thanks,
Candrian

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How much room on the 'other' side from the 90 deg bend?

Would something like this:



be made to fit with a bit of a spacer under the hexagonal end? Not cheap however at 3.62 quid per nF!

You probably have to enter it on the german site, I don't know.

Its a guy who sells 5 PCM testers for 370 EUR. He bought them for the sole purpose of having parts for his NFAs...

cheers
Martin

Well, yes, just one instrument for both of us would be fine.... But no, thanks.

Cheers....

That item doesn't show up as anything. What was it?

--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix/Linux - We don't do windows

Hi Harke,

item #294954912663 on a well known auction site would probably yield a good stock of these.

Not a bargain, unfortunately.

cheers
Martin

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Hello Martin,

I immediately recognized this feed-through capacitor. Seems typical for WG as my Rauschpegelsender RS100 has the same. One showed a short and as I considered it as unobtanium, I just removed this cap and installed a wire. Not so nice but it works. In the RS100 it is used as connector to supply + 12 V to a pcb with the noise generator. I guess the mechanical force in the end destroyed this feed-through cap.

Obviously: if you find a source, please let me know.

Best regards,

Harke

Hi all,

I'm looking for a replacement for a shorted feedthrough capacitor for my SNA1 Wandel & Goltermann analyzer. It seems special in that it is very thin on the interiours side, where the bended wire is. I cannot find anything like that on the internt. Below some pics (metric scale!).

The parts list says 8c20 / 0855-0020.0008 / C-Keramik / ZZMZ / 4N7 / 20/80 / 63V.
So its a 4n7 ceramic capacitor with 63V rating. In the SNA this capacitor is handling a 12V supply line.

Does anyone have a similar item in his drawer?

thanks
Martin