HP 8702D - What is the latest firmware?
Hello,
I am searching for a few days for the 8702D firmware without any luck.
I saw some CPU boards on eBay showing version 6.14 on the EEPROMs. Does anyone have the firmware files?
Is the Lightwave Analyzer 8702D supporting version 7.x firmware?
Thanks,
Razvan
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Re: Agilent E8357A Network Analyzer Phase Lock Lost Error
Link to the manual,, https://elektrotanya.com/hp_agilent-technologies_e8356a_e8357a_e8358a_network_analyzer.pdf/download.html
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Re: HP8510C "system bus address error", but then it works
Thanks for the replies!
I did a factory default, but it changed nothing. RF switch was already at 31, so I also set the power meter to 31 (assuming 31 means "not there"), and moved the printer and plotter to RS232. The "disc" is still at 0.
In system/more/multi source edit I pressed OFF and save.
I still get "system bus address error" on boot, also if I pres user preset.
I have a HP double floppy box from the 300 computer, should I try to attach that?
Could this be some cable fault? As stated above, source and test set respond well to commands from the 8510.
?
Regards,
Marko Cebokli
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Hi all,
I have acquired the above sensor with the matching?
attenuator. It zeros but takes a couple of hours to stabilise. before I start digging to deep is this something that can be repaired easily?
thanks
tony?
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Wanted WR 08 and WR 10 components
Wanted WR 08 and WR 10 components
?
Hi all I live in the UK and I am looking for wave guide items and wondering if anyone can help me with the following ?
Power measurement 70 to 110 GHz? WR 10
Power measurement 90 to 140 GHz? WR 8
Directional coupler 90 to 140 GHz? WR 8 ??????preferably 10 db or 20 db
Wave guide load to go with Directional coupler? 90 to 140 GHz? WR 8? good for 50 mw
Frequency multiplayer with an output on 140 GHz
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Please privet message me Regards Paul
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Re: Agilent E8357A Network Analyzer Phase Lock Lost Error
Yes? that is curious.? Block diagram shows a switch in line that you may have to command to goto external 10 MHz ref.?
I have? not looked at the service manual but I would check to see if there is sufficient troubleshooting details, tree diagram etc... to warrant working on these module cards. PLL systems do require a divide and conquer approach.?
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Re: HP8566B band amplitude response discrepancy - how much indicates a component failure?
Perhaps it's the YTX (tuned filter) tracking/tuning is off
kilter?
Especially, if the frequency accuracy of what signals can be seen
on screen is relatively OK, that would prove the swept local
oscillators are tuning OK, irrespective of the indicated
amplitude.
Just thinking back some decades to when I was servicing such
things for another well known measuring instrument maker.? Yig
Tuned Filters were just as important to get sweeping correctly.?
There again, on those things there was a user control for
"peaking" the front end YTF, and you did need to use it, as things
changed noticeably as the instruments warmed up.
Going back under my rock.
Dave 'KBV.
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HP8756A - cal data backup and recovery - FYI.
Hi to the HP-Enthusiasts, Dear Aaron!
On the weekend Aaron approached me because of the work I have done to
re-program my HP8756A scalar analyzer with fresh calibration data.
My analyzer lost data quite quickly and that was because one of the
caps developed a signigicant leakage current. So I replaced all of them
and added a larger Li battery to the CPU board.
For programming, I used (in the 2000s) a sun workstation and the sbus
GPIB adapter which was in there, so that code is not of much use
nowadays. But the procedure was as follows:
Using a calibrated HF-voltmeter, I created a table of the output power
of my 8350B generator for all attenuator steps. Than I connected
the detector to the 8350B and made a measurement using the un-
calibrated 8756A (with cleared calibration data).
From that, I calculated correction polynomials for all three channels,
(taking into account the frequency and the correction value printed on
the detector head for the frequency I was running at).
In a last step I wrote the polynomal into the 8756A and after that it
gave the correct readings as measured with the HF-voltmeter.
Attached is the C source file for your amusement (there you can see
how the polynomial gets written). Should not be hard porting that
to a modern platform.
(1) USE AT YOUR OWN RISK
(2) Would be happy if you mention my work ;-)
Best wishes,
Erik. www.baigar.de
P.S. Of course a much better method would be analyzing the 8757 cal
program (which does not work with the 8756A of course!)...
...on how to drive the 11613B calibrator...
...and with the knowledge from my c code creating a new, nice
calibration software (preferrably for linux ;-)). Actually
I have got one of the 11613Bs, but the project never has
taken off...
P.P.S. The only reason to bother with the 8756A is, that I have the
equipment doe measurements up to 18G which is not the case
for my VNWA.
-----------------------------------------------------------------------
''~``
( o o )
+--------------------------.oooO--(_)--Oooo.-------------------------+
| Dr. Erik Baigar Inertial Navigation & |
| Salzstrasse 1 .oooO Vintage Computer |
| D87616 Marktoberdorf ( ) Oooo. Hobbyist / Physicist |
| erik@... +------\ (----( )---------------------------+
| www.baigar.de | \_) ) /
+----------------------+ (_/
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Re: 16-pin Connector Part Number for 11713-60044 cable
On 5/27/25 09:30, 4X6MU via groups.io wrote: Does anyone have infor on the 16-pin Connector Part Number for 11713-60044 cable?
Mates with many RF switches and Step Attenuators. If we're thinking about the same ones, they are Viking/Thorkom p/n TNP12-101. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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16-pin Connector Part Number for 11713-60044 cable
Hi Guys,
?
Does anyone have infor on the 16-pin Connector Part Number for 11713-60044 cable?
Mates with many RF switches and Step Attenuators.
?
Thanks & BR'
?
Ilan 4X6MU
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Re: HP 54503A Memory address error
Very similar on a 53310A MDO. Error came and went, only to disappear totally (knock on wood).
In my case, I could cause it by switching on the Iwatsu DS6612-Oscilloscope which stood right above the unit.
--
With best regards
Tam HANNA
Enjoy electronics? Join 21k4 other followers by visiting the Crazy Electronics Lab at
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Re: Agilent E8357A Network Analyzer Phase Lock Lost Error
Looking over the results from the Serial Bus Test .
Most of the Test Point measured voltages on the A-8 Fractional-N Board are wrong except the +5Vdc Supply Voltage, +15 Current Draw and PreTune Buffer Output.
VCO Tune Voltages, ALC DAC Voltage,? VCO Compensation, all out of range.
?
The 30kHz Phase Detector and 30kHz Phase detector Integrator on A-11 Phase Lock Board, used only by Band 0, are all fed by the A-8 Board 150MHz circuit.
?
I would think looking for a new A-8 Board is my only option.
And possibly change the OCXO to one in spec.
I did feed an external 10.000004 reference into the back BNC but it didn't make a difference to 5Mhz, which is Curious.
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Re: HP8566B band amplitude response discrepancy - how much indicates a component failure?
When working with the upper bands which go through the YTX be sure that the <PRESEL PEAK> values aren't way off into the weeds, if they are the measured amplitude will be a lot lower than reality.
?
Each upper band can be preselected-peaked to ensure that the YTX bandpass is optimized/positioned to achieve the greatest (most accurate) amplitude.
?
Do a <SHIFT> <PRESEL PEAK> (KS=) to set the <PRESEL PEAK> values back into their factory preset values.
?
After ensuring that the <PRESEL PEAK> values have been reset, check to see if there is any improvement in the observed amplitude.
?
If you don't see any improvement in the amplitude response then you will probably need to go through the lengthy YTX alignment process, which does require having a suitable signal source.
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Re: Agilent/Keysight AWG 33250A /33220A CAL
Bonjour cher monsieur Yves, mille mercis pour votre réponse rapide.
Quelle surprise de trouver un Fran?ais avec ce vieil et bel instrument.
J'habite à Paris, où habitez-vous ?
Nous pouvons continuer à discuter par PM ou e-mail
Bonne journée
Translated with DeepL ()
Jon
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Re: Agilent/Keysight AWG 33250A /33220A CAL
Bonjour Jon,
Les constantes de calibration sont sauvegardées dans un EEPROM.
Je possède un 33120A et un 33220A.
J'ai déjà calibré moi-même ces deux instruments, évidemment ?a prend un certain temps surtout pour la première fois, car il est préférable d'y aller lentement pour éviter des erreurs.
Dans le manuel de service vous avez les informations incluant le schéma électrique.
J'ai inclus un test de vérification pour un 33120A, ?a vous donne une idée de la t?che.
Je suis en train de revérifier mon programme de test en ce moment, je continuais ce projet déjà commencer il y a quelques mois.
Les tests étaient automatiques, mais la calibration manuelle.
Là je veux rendre tout automatique, pour le 33120A et 33220A.
Je jetterai un coup d'?il pour le 33250A pour voir si c'est très similaire au 33220A.
J'ai un ami qui pourrait peut-être me prêter un 33250A, je pourrai vérifier en même temps pour voir les similitudes entre le 33220A et 33250A.
Je vous conseille de faire dans un premier temps, la série de tests pour voir si votre 33250A est hors spécifications.
The calibration constants are stored in an EEPROM.
I own a 33120A and a 33220A.
I've already calibrated both instruments myself, but obviously it takes some time, especially for the first time, because it is better to go slowly to avoid mistakes.
The service manual contains information including the wiring diagram.
I've included a verification test for a 33120A; it gives you an idea of ??the task.
I'm currently revising my test program; I was continuing this project I started a few months ago.
The tests were automatic, but the calibration was manual.
Now I want to make everything automatic for the 33120A and 33220A. I'll take a look at the 33250A to see if it's very similar to the 33220A.
I have a friend who might be able to lend me a 33250A, and I can check it out at the same time to see if there are any similarities between the 33220A and the 33250A.
I recommend you first run the series of tests to see if your 33250A is out of specification.
Yves
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-----Message d'origine----- De : [email protected] < [email protected]> De la part de Froggie the Gremlin via groups.io Envoyé : 26 mai 2025 02:58 ? : [email protected]Objet : [HP-Agilent-Keysight-equipment] Agilent/Keysight AWG 33250A /33220A CAL hello everyone Bonjour a tous... This fine 80 MhZ AWG (circa 2016) needs a full calibration similar to the 33220A 20 MhZ. Do either of these generators, use a back up battery or NV ram that can lose the calibration Constants over the years? Can calibrate in a few hours? Any tips or experience (on either part number) is appreciated. Bon Soiree jon
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Re: HP8566B band amplitude response discrepancy - how much indicates a component failure?
I have only done the adjustment procedure for A20, with the "preferred method" where you enter a bunch of shift-command stuff that gets saved, then you go between recall 1 and recall 2 registers that forces the YTO (1LO) output to either 2.3 or 6.15 GHz. You're supposed to alternate between the two settings while monitoring 1LO with a counter (which I have referenced from the 8566B's 10 MHz ref to get "exact" counts) and tweak it for the correct readings through a number of iterations, since they interact. This seems to have worked as it was supposed to, after about eight iterations. I tried this earlier while it was still broken (C18 on A19 was shorted) and it was stuck around 2.1 GHz. BTW this part was discussed in the first different thread about the problem - it is here for reference in case it wasn't seen:
?
/g/HP-Agilent-Keysight-equipment/topic/hp8566b_band_amplitude/113315244
?
Once it was all back together, the only frequency control part that really changed was the YTO - all the boards were original, except for A20's tweaks and A19's repair. I figured that the pre-tune DAC stuff on A19 should be still be good and appropriate for the YTX et al, IFF that keys off the sweep/tune signal(s), and not the YTO coil drive, AND only I have previously tweaked anything else while attempting to fix the original problem. So, with everything original except the YTO, I think adjusting only its coil drive on A20 was right to align it with the the rest. I had already messed it up while broken, and the procedure did work after the fix, so presumably it now tracks properly with what it is given.
?
The big question I think is whether my assumptions were right about the overall control scheme, and any past possible tweaking by others. I'll have to review the adjustments and theory of operation for all that, unless someone happens to know a quick and easy answer. I think it boils down to whether the YTO coil adjustments on A20 directly influence the YTX control or other things, or is it only apparent in effects on their relative alignment. I believe the adjustments on A19 affect both the YTO and the YTX system, but after that they are separate things that still track each other according to proper adjustments. If someone has tweaked things wrongly in the past, then that's another separate story to resolve. Of course there's always another story, which is whether there are other failures. Oh well, one thing at a time.
?
Ed
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Re: HP8566B band amplitude response discrepancy - how much indicates a component failure?
You’ve gone through the YTO loop calibration, right?? If the pretuning controls aren’t right for your replacement YTO, it might end up off-frequency far enough to make certain bands look worse than others.? ? You do NOT want to mess with the YTX calibration process unless you have a lot of time on your hands and a suitable sweeper. ? -- john, KE5FX ?
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From: [email protected] <[email protected]> On Behalf Of ed breya
Sent: Monday, May 26, 2025 12:57 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] HP8566B band amplitude response discrepancy - how much indicates a component failure?? I'm still looking at this 8566B I just repaired, and pondering what it takes to do more adjustment. Right now it looks like the 2-5.8 GHz band shows over 12.5 dB lower than in the low 0-2.5 GHz band. I'll probably start trying to tweak things to see what's needed to bring it up to par. This is the unit that had a shot YTO - the oscillator Q had B-C shorted, evidenced by the blown collector bias resistor in one of the "RO" spots. With the fresh YTO and the A20 adjustments done, the 0-2.5 GHz band seems to work fine, so I know the frequency controls and 1LO power are sufficient. I think the 13 dB or so less in the next band and whatever amounts in the higher ones should be easy to correct with proper adjustments, but I have never done this on any of my 8566s. I'm wondering whether this initial difference is no big deal in the scheme of things, or indicative of some other failure. From a quick look at the adjustment document it looks like it will get quite complicated and tedious, involving alignment of the YTX with the YTO and such, band by band. There's a lot going on in there. I think the main thing next is to assess the condition of the YTX. The only comparison I've done so far is in the overlap of the bands around 2.3 GHz. The low band is checked against the 100 MHz -10 dBm cal reference (which I checked with the 436A), then the response is checked at 2.3 GHz ~0 dBm from the HP70331A and then in the 2-5.8 band. The preselector peaking process seems to work through its routine, so the YTX must be doing some tuning at least. Anyway, I think it's likely OK and close enough operationally that it's mostly going to be about adjustments, and not some other component failure. I'll find out eventually, but it seems a lot more involved than I had expected. I'm hoping for a fairly low frustration and anxiety level.
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HP8566B band amplitude response discrepancy - how much indicates a component failure?
I'm still looking at this 8566B I just repaired, and pondering what it takes to do more adjustment. Right now it looks like the 2-5.8 GHz band shows over 12.5 dB lower than in the low 0-2.5 GHz band. I'll probably start trying to tweak things to see what's needed to bring it up to par. This is the unit that had a shot YTO - the oscillator Q had B-C shorted, evidenced by the blown collector bias resistor in one of the "RO" spots. With the fresh YTO and the A20 adjustments done, the 0-2.5 GHz band seems to work fine, so I know the frequency controls and 1LO power are sufficient.
?
I think the 13 dB or so less in the next band and whatever amounts in the higher ones should be easy to correct with proper adjustments, but I have never done this on any of my 8566s. I'm wondering whether this initial difference is no big deal in the scheme of things, or indicative of some other failure. From a quick look at the adjustment document it looks like it will get quite complicated and tedious, involving alignment of the YTX with the YTO and such, band by band. There's a lot going on in there. I think the main thing next is to assess the condition of the YTX.
?
The only comparison I've done so far is in the overlap of the bands around 2.3 GHz. The low band is checked against the 100 MHz -10 dBm cal reference (which I checked with the 436A), then the response is checked at 2.3 GHz ~0 dBm from the HP70331A and then in the 2-5.8 band. The preselector peaking process seems to work through its routine, so the YTX must be doing some tuning at least.
?
Anyway, I think it's likely OK and close enough operationally that it's mostly going to be about adjustments, and not some other component failure. I'll find out eventually, but it seems a lot more involved than I had expected. I'm hoping for a fairly low frustration and anxiety level.
?
Should I worry?
?
Ed
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Agilent/Keysight ENA 5071C Receiver Gilbert Cell Mixer 1GC1-4405
I have been fixing some 5071C ENAs.? Many of them have bad receivers.? Upon doing some tests & research, I noted that the Gilbert Cell Mixers were bad.? This is generally on port 1 on roughly 5 of 10 units, probably due to overheating from the units being left on day and night for years.? These mostly have the part number 1GC1-6234.? Some have 1GC1-4234.? But today I opened up a more recent version which has part 1GC1-4405.??
?
Replacement parts for any of these are expensive and hard to source.? It appears that 1GC1-4298 is a suitable replacement for the 1GC1-6234 and 1GC1-4234.? What I haven't been able to figure out is if the 4298 can be used to replace the 1GC1-4405.? Is there anyone who can provide any insight on this?? I've contacted Keysight in the past on this unit, but they pretty much just want me to send them the unit so that they can fix it and charge us accordingly.
?
cheers-
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Re: Agilent E8357A Network Analyzer Phase Lock Lost Error
Useful to be sure the clocking of the frac N counter (5 MHz) reference is ok. Does the manual provide logic?
swing levels? Scoping the clock at W4-1 should be sufficient. Then, does the manual provide a guide to a setup?
of the A8 card if the VNA were set for a CW no sweep condition. Opening the loop to investigate the frac N count?
is required and opening the control of the vco's is needed to see if the control voltage from the phase detector(s) makes
sense. You really need detailed information from the manual if you desire to troubleshoot the A8 card to the component level.?
Assuming, you want to do so. I am not aware of the availability of cards for that instrument.?
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Paul Bicknell
Dave McGuire
4X6MU
rmb_guru
Froggie the Gremlin