Hi, I've some HP specans just obtained as BER items from a local space communication site.
The first one I'm looking at is an HP8561E, it powers on OK and the display is bright but the text is jittery and almost unreadable.
I'm guessing "check out the PSU, Paul" is the way to go but does anyone have any insight on this model/fault they might like to share?
I'm also looking for component level schematics etc.
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The other items I have are all HP859x series.
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Any info welcome thanks
Paul
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HP8510C "system bus address error", but then it works
Got my hands on a 50GHz 8510C with test set and source, everything mounted in a mobile rack with a pullout table.
When I switch it on, it says "caution: system bus address error", but them it proceeds to function OK.? Both the test set and source respond to commands. I have checked the addresses, and they are set as specified in the manual, both on the instruments and in the HP-IB setup menu.
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Not much of a problem, since I can use the analyzer, just a bit annoying. Any idea how to fix this?
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Marko Cebokli
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Re: Agilent E8357A Network Analyzer Phase Lock Lost Error
Actually measuring again with a counter I come up with 10.000447
Not to say my equipment is perfectly accurate.
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Re: HP 8902A Measuring Receiver
Hey there Raymond,
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I've done a little futzing with the power supply and the input amp on my 8902, so I'm happy to try and help where I can.
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I think you might get more traction on the group if you describe the problem you have and see who might have ideas about how to address.
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TonyG
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Re: Agilent E8357A Network Analyzer Phase Lock Lost Error
Are you saying 4.999756 is in error?
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Re: ftp.agilent.com tar-file on archive.org
I have been downloading files with "wget" for many years, but never used the "-c" option (I guess as long as one just downloads "regular" size files, it doesn't matter that much).
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It worked like a charm! Thank you for the tip.
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Best,
Wolfgang
KI7PFX
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On Thu, May 15, 2025 at 05:23 PM, Wolfgang Schraml wrote:
Thanks. I'll give that a try.
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Wolfgang
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========================================
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On Thu, May 15, 2025 at 01:05 PM, Razvan Popescu wrote:
I download the whole archive a few years ago. I also had issues with the
download at that time but it was easy to resume the download because I
started it using "wget".
If you don't have a Linux box you can use the wget for Windows in a
Command Prompt window.
You can download from here the latest wget binary for Windows.
Use the following command:
wget -c
Best regards,
Razvan
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Re: Agilent E8357A Network Analyzer Phase Lock Lost Error
Why is the 5 MHz in error, while the 10 MHz is correct??
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Re: Checking an 8402B Calibrator
Tony,
If you have or can borrow one, the Fluke 8840A does High-Z up to 20Vdc.
--John Gord
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On Sat, May 24, 2025 at 09:03 PM, Tony Goodhew wrote:
Thanks, Jim & Charles - Appreciate it.
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Where I find myself is that the 8402B manual says to look at a voltage that is around 17.8 Vdc above the -30V rail (Section 5-7 in the manual) - This pushes my 34401A into the 100V range, which means it is only 10Mohms input impedance (there are two measurements that are here, otherwise I can just use the 10G setting and do the other ones) - This is why I think I need to implement a voltage follower with an OpAmp to get the >100M input impedance.
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Having never done this before, I'd love guidance from anyone who has done this or worked with the 8402 - Coming back to the reason I'm asking is that I have a 431C which was broken and I think I've fixed it but I sort of need the 8402 to confirm that I have done that (Old lady swallowing fly and all).
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Thanks,
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TonyG
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Re: Checking an 8402B Calibrator
Thanks, Jim & Charles - Appreciate it.
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Where I find myself is that the 8402B manual says to look at a voltage that is around 17.8 Vdc above the -30V rail (Section 5-7 in the manual) - This pushes my 34401A into the 100V range, which means it is only 10Mohms input impedance (there are two measurements that are here, otherwise I can just use the 10G setting and do the other ones) - This is why I think I need to implement a voltage follower with an OpAmp to get the >100M input impedance.
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Having never done this before, I'd love guidance from anyone who has done this or worked with the 8402 - Coming back to the reason I'm asking is that I have a 431C which was broken and I think I've fixed it but I sort of need the 8402 to confirm that I have done that (Old lady swallowing fly and all).
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Thanks,
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TonyG
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Re: Checking an 8402B Calibrator
Hi,
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the 34401A can do >10 G¦¸ input R but only on the 10V and below ranges:
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Blue Button
(Menu) On/Off
 ? ?(Down arrow)  ? ?(Right arrow) Enter
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See pages 27 and 53 of the manual (well the year 2000 version anyway).
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regards
Charles Edmonds
VK3CLE?
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Re: Checking an 8402B Calibrator
Try using the 34401A in hi-Z (high impedance) mode, Tony. ?I had to do that once about 10 or 15 years ago when measuring voltage in a low current circuit. ?Got weird results until I switched it to hi-Z mode. ? HTH.
Jim Ford Laguna Hills, California, USA?
toggle quoted message
Show quoted text
On May 24, 2025, at 6:17?PM, Tony Goodhew via groups.io <tony_goodhew@...> wrote:
? Hey All,
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I'm looking at an 8402B calibrator, and the manual says that the measurements need to be done with a floating DMM that has a greater than 100Mohm input impedance.
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The manual says to use an HP 740B - I don't have one of these, so I'm thinking of using an HP 34401A with an OpAmp Voltage Follower to buffer between the 8402 and the 34401.
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Has anyone done this before and could provide any insights?
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Thanks,
TonyG
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Checking an 8402B Calibrator
Hey All,
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I'm looking at an 8402B calibrator, and the manual says that the measurements need to be done with a floating DMM that has a greater than 100Mohm input impedance.
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The manual says to use an HP 740B - I don't have one of these, so I'm thinking of using an HP 34401A with an OpAmp Voltage Follower to buffer between the 8402 and the 34401.
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Has anyone done this before and could provide any insights?
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Thanks,
TonyG
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Re: Agilent E8357A Network Analyzer Phase Lock Lost Error
Forgot to add the Block Diagram.
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Agilent E8357A Network Analyzer Phase Lock Lost Error
I have been troubleshooting my Network Analyzer using the E8356A, E8357A , E8358A Service Guide June 2004. This 8357 has an upgraded 700 MHz CPU.
After reading and Option 015.
My problem is Phase Lock Lost error in a number of bands. All would seem to relate to the A8 Fractional-N Synthesizer Board Assembly.
Fortunately I could partially run the Serial Bus Test where I found wildly out of spec voltages on the board.
The Serial test node numbering on my application do not coincide with the manual Nodes but the description places me in similar territory as the Manuals Node descriptions.
The test has a minimum and maximum range for the Node as I will describe.
??????????????????????????????????????????? Min????????????? Result?????????? Max
+5Vdc Supply Voltage???? 4.28.?????????????? 5.0?????????????? 5.78.???? OK
Band ALC Level???????????????? -8.27?????????? 14.0169????????? 1.0??????? Bad
VC01 Tune Voltage???????? ?? 6.3???????????? -1.345 ?????????? 14.3???? Bad
VCO Compensation ? ?? ?? 2.07??????????? 13.748??????????? 4.07????? Bad
????????
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Node descriptions A11 Phase Lock Board. ( the signals to the A11 board 30kHz block come from the A8 Fractional-N board.
30kHz Phase Detector???? -0.33.???????? -5.088 ? ? ? ? ? 0.33. ? ? Bad?
30kHz Phase Detector Integrator
?????????????????????????????????????????? -2.86?????????? -13.827?????????? 0.44.???? Bad
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10MHz Frequency.? 10.000000
5Mhz Frequency?????? 4.999756
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A10 Phase Lock Test??
Network Analyzer Setting?? W39? From A10J5
Band 0???????????? Setting 9.9MHz???????????? Result should be? ??? 9.9MHz ??????????????????? Actual Measurement ??????? 9.87??????? (Very weak signal)
Band 1 - 6.?????? Setting. 1 GHz?????????????? Result should be ?? 1.04166MHZ ??????????? Actual Measurement ?????? 1.041616MHz
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A8 Fractional -N
Band 0 Output????? Setting 5MHz.?????? Result Should be 120.16 MHz.??? Actual Measurement?????????? No distinct signal
???????
I have added pics from CW Testing showing the frequencies and Bands affected.
And the 20MHz - 550Mhz segment.
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My questions: 1. Would you agree with A8 Fractional board being bad?
???????????????????????? 2. Are there A8 Boards available in the < = 500 dollar range.
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HP 8902A Measuring Receiver
To anyone with HP 8902A expertise,
My HP 8902A is in need of repair and some expert advice would be most helpful. Before going into details, I would like to hear from someone who is willing to assist.
73
Raymond ON4DBV
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On 5/23/25 20:46, Philip Freidin via groups.io wrote: I'm not a group manager, but since you have posted a message,
I am pretty sure you have now joined the group. Welcome.
You may want to select subscriptions on the left side of the web
page, an adjust settings to match the way messages are delivered I had given him this info offline. Nice to see you here Philip. -Dave (group owner) -- Dave McGuire, AK4HZ New Kensington, PA
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I'm not a group manager, but since you have posted a message,
I am pretty sure you have now joined the group. Welcome.
You may want to select subscriptions on the left side of the web
page, an adjust settings to match the way messages are delivered
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Philip
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Re: HP8566B with YTO unlock indication appears to have no YTO output at all
I think it's fixed and running beautifully. The other A19 board was functional but significantly different on top and none of the labeling on the plastic cover matched the board, so I decided I should fix the original. I quickly found that the -12.6V reference was out (only about -1.7V), but it took a while to figure out since there are a number of things that could do it. The culprit was perhaps the absolute last thing I would have expected. I had a couple of usual suspect Ta caps, a couple of high-K ceramic caps, a bunch of negative opamp rail circuitry to make -24V from the -40V supply, and of course the opamp itself that regulates the reference from a TC Zener.
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After some test point wire tacking and operating measurements I found that the input to the opamp U3 was shorted to ground by C18, showing about 18 ohms. I couldn't believe this high grade plastic cap could have failed - it's not even a high stress spot at all, just extra filtering at the input against 5.11 kR from the Zener. C18 and its counterpart C22 in the +10V reference apparently needed to be high grade (I'm virtually certain these are PPF = polypropylene and foil) types for very low ESR, ESL, and DC leakage. I have some of these salvaged from other gear over the years, so I immediately recognized the type, and I can often tell by the density, which usually "feels" higher than film type caps. This is a relatively fancy and expensive part, and physically big (board space-wise), so there must have been good reason. A cap like this failing in a spot like this has to be an extremely rare random failure.
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I found an equivalent one in stock, popped it in, and voila, just like new. All the original boards are back in now. I assumed the original setup for A19 is still good enough, so I only did the A20 adjustments, and this time the procedure worked as it was supposed to. It seems to be all working now, but will need some more checkout to be sure. I am happy for now.
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Ed
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Re: HP8566B with YTO unlock indication appears to have no YTO output at all
I tried to do the adjustment procedure for A20, but could not get the YTO frequency above about 2.1 GHz, and likewise with any settings of the SA. Fortunately I have on hand a nearly full parts carcass, so I found by board swapping the actual fault appears to be on A19, the DAC pre-tuning board. Now the unit has original A21 and A20 (but all messed up from trying to tweak it before), and a different A19, that all now seems to work. The A19 is a different board version - I don't know if it's newer or older than the original here, but it should be OK.
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I'll have to try the whole procedure for tweaking it up, unless I can quickly find and fix the fault in the original. Now that I know where to look, I will poke around in there and see what's up.
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Ed
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Thanks Don.
I noticed that when I turn on the device the red LED on the A6A7 (YTX current driver) board lights up for a few seconds, after which it turns off completely and the green LED seems to indicate that everything is correct: is this normal?
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Dave McGuire
Philip Freidin