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- HP-Agilent-Keysight-Equipment
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Re: HP-8566B, HP-8566A used without display
开云体育John, The display section is more that the CRT circuits; it's also the IF section. Along with the HPIB you'd need to capture the IF signals and do the processing in software. As you said, probably hellish to do, but an interesting project to think about! I remember some of the ATE from decades ago in the USAF and yes, often the display was done away with. When it came to the metrology lab we had display sections available so we could do the calibration at first, and later I think the labs got ATE capability. I'm not sure how the developers did their magic but I suspect it was a similar method.? Steve WB0DBS On Oct 16, 2015, at 9:09 AM, John Griessen john@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
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Re: HP 83592B hangs 8350B sweeper
开云体育Has anyone noticed that boards in HP 8350 plug-ins have part numbers different from the plug-in model? My 83592 has two boards, A6 and A7, that have part numbers starting with 83595-x. The others start 83592-x. ? I know that replacing the A6 board (83595-60106) with a good one (83592-60106) gets the plug-in working, even with the 83595-x A7 board. ? On the bad A6 board I have found that a pot (R63, SRD bias) was missing and the Band 0 jumper was in the B1 position. The board also has two extra pots which are not shown on the schematic or component location. There are seven single turn pots on the top left, viewed from component side. They are shown in the 83595 manual. Did someone try to get it running with the board from a 83595 (0.01 to 26.5 GHz) plug-in? I need to look carefully at every component. The 60106 in the number is the same (83592-60106) and the boards look identical but I’m sure there are component differences as I have found. I do not believe that this is the original board for the plug-in. ? I have seen instruments put together with odd parts before. I have an HP8656A chassis that is part 8656A and part 8657A inside. I gave up troubleshooting when I discovered this. This is a very dishonest practice to do this and sell the items as-is, for parts, etc. ? ? |
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3561A LCD mod
After the fly-back transformer blew I decided to try an LCD mod for this analyzer.? The A90 Display Board along with all the high-voltage circuits are no longer needed and removed.? It's been several weeks but I have a working version.? There's still an issue but I'm not sure if it can be resolved easily.? HP decided to use vertical line scans (the fast sync) instead of the normal horizontal scans for a normal monitor.? I can only surmise that HP wanted to keep from skewing the data by posting all the "Y" values for a given "X" as the "X" value increments with the graph origin located at the bottom left of the screen.? This is real time plotting so maybe there might be some noticeable distortion to the displayed data had they used a normal CRT scan.?? So now the slow scan becomes the horizontal scan on a typical monitor!? The result is that the display is rotated 90 degrees CW on a standard LCD monitor. I worked out a circuit to emulate an old-school XT color graphics adapter. The added benefit is that the two raster streams (full & half bright) can now be assigned any of the RGB color combinations.? The sync timings with the A60 Digital Display Driver oscillator (22.589 MHz) is too slow to fit an entire line scan on a modern LCD monitor.? I started modifying the display board with several oscillators to see what would happen.? The A60 board also has a selector for the slow sync of 60 Hz (power line frequency) or Free Sync which is tied to the on board oscillator which provides additional modes to test.
I tried several oscillators and anything above 24 MHz causes too much jitter with the display and the monitor has a hard time synching with the signal.? I wanted to try a frequency in the 23 MHz range but didn't have a standard oscillator style like the original so I built an oscillator with some inverter gates (74LS04) and a 23.247 MHz crystal.? It's mounted on top of the board with a selector block to choose between the old and the new oscillator. This works fairly well but I would like to get a regular oscillator so I can close up the case. I've added some pictures in my "3561A Repair" photo folder.? I've included the final display results showing success at getting a complete raster display on the LCD monitor so at least it's usable again! Since I'm running at a faster frequency the skewing problem might not be an issue so the main question is - would it be possible to modify the way the pixels are mapped to memory so that it emulates a standard display?? I've got my 1650A Logic Analyzer working but don't have a clue where to start looking at bits and bytes.? There is some description in the manual for the A60 board and it appears that all the addressing is done on the A60 board:? "The byte address consists of two parts: a row address and a column address.? The column address is taken from the upper seven bits of the position address register, the row address is taken from the next seven bits.? The bottom three bits of the position address register are decoded to form the bit address bus (RAM selector)."? I'm thinking that the CPU is assigning the coordinates and the A60 board is converting it to a position address.? If that's the case then there is probably a ROM that needs to be modified (well above my capabilities).? If anyone has a clew HOW or IF re-addressing the pixels is possible please let me know. Gary |
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Re: HP-8566B, HP-8566A used without display
On 10/16/2015 10:09 AM, John Griessen john@...
[hp_agilent_equipment] wrote: I've done it with a 70K-series SA, it's easy to do. I believe theYou might look into a TFT display replacement.OK. I don't have an 8566B or a display for it. The question was, Does anyone use command set is similar to that of the 8566. The 70900 LO/controller has an "8566 compatibility mode" for ATE use. -Dave -- Dave McGuire, AK4HZ New Kensington, PA |
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Re: HP-8566B, HP-8566A used without display
On 10/15/2015 04:48 PM, sgm460122@... [hp_agilent_equipment] wrote:
You might look into a TFT display replacement.OK. I don't have an 8566B or a display for it. The question was, Does anyone use the GPIB port to get SA sweeps and is it practical, or is there much other settings info that would be missing and make it hellish to do? I just read that some ATE users didn't buy the display. Did those ATE programmers always have one with the display to develop on? John |
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Re: cleaning contaminated boards
If it is a NiCad chances are you have highly alkali potassium salts that will happily eat their way through copper.? In situations like this the approach I take is:
1/ Remove the leaking battery. 2/ Remove as much blue crud as possible with a scalpel and metal scribe/pick, being careful not to damage components and traces, and in some cases where it has eaten its way under solder mask you have to carefully scrape that away to reveal more blue crud. 3/ Neutralise the remaining potassium salts with white wine vinegar.? Dab it on with a stuff brush and scrub firmly but carefully.? Leave it for a while. 4/ Wash the entire board with distilled water, again careful but firm scrubbing.? Repeat a couple of times. 5/ Put board in a warm dry place to thoroughly dry out.? If you can also use a dry air blower aerosol to make sure you blow out any water in tricky places such as under DIPs. Before doing any of this make sure you do your research on the particular battery chemistry you're up against. Good luck! Neil |
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Re: Searching for a Pwr/Supp Circuit HP-8591A P/N 0950-1977
Hi Clint,
I am sending my hand made diagram ... Best regards / Roumen LZ3RV, Sofia, Bulgaria On Fri, Oct 16, 2015 at 10:21 AM, 'hardy' hardyhansen@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
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Re: Searching for a Pwr/Supp Circuit HP-8591A P/N 0950-1977
Hi
I think it son didiers site Hardy Fra: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] Sendt: 16. oktober 2015 08:04 Til: hp_agilent_equipment@... Emne: [hp_agilent_equipment] Re: Searching for a Pwr/Supp Circuit HP-8591A P/N 0950-1977 Hi Clint, I have a pdf file and notes from Roumen / LZ3RV. Did you find it? QSP to vk4jkl AT wia.org.au 73 John @ irlp 6163 Ingen virus fundet i denne meddelelse. Kontrolleret af AVG - www.avg.com Version: 2015.0.6140 / Virusdatabase: 4447/10825 - Udgivelsesdato: 15-10-2015 [Non-text portions of this message have been removed] |
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Re: HP3325 transistor
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From: "wallydoc@... [hp_agilent_equipment]" <hp_agilent_equipment@...>It isn't Selenium, it is a SELected part. Does anyone know what this crosses to?It was replaced with HP 1854-1010, which is a MD918A. This is listed as being replaceable with an NTE81. There are a couple MD918A on Ebay, starting at $4.99 Here is a list of stocking distributors. Keysight states that a limited supply of the 1854-1010 are available for $ 20.17, each. I think that is a pair of 2N918A transistors, on the same die, to reduce drift. That is replaced by the NTE108-1, and Newark has those for 94 cents each. I would use a pair of them to replace a suspect transistor for testing, before spending $21 to $30 for a new part. Do you think this could be the problem? Michael A. Terrell |
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Re: HP-8566B, HP-8566A used without display
Tom Miller
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I must agree with Rich. These are very nice displays and make the 8566/68
SA into a modern instrument. Simmconn has done a very nice job with this
kit.
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Regards,
Tom
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Re: HP-8566B, HP-8566A used without display
DUH....
You might look into a TFT display replacement. I have one in my HP-8567A and I am well pleased with it. You can look it here and download the Instruction Manual. You an browse his website and see what other upgrade kits that he has available. RICH From: "John Griessen john@... [hp_agilent_equipment]" To: hp_agilent_equipment@... Sent: Thursday, October 15, 2015 2:06 PM Subject: [hp_agilent_equipment] HP-8566B, HP-8566A used without display
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Does anyone have experience programming them with GPIB to make plots?
I'm wondering if that is a viable option since the displays are so old and fading... |
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Re: HP-8566B, HP-8566A used without display
You might look into a TFT display replacement. I have one in my HP-8567A and I am well pleased with it. You can look it here and download the Instruction Manual. You an browse his website and see what other upgrade kits that he has available. RICH From: "John Griessen john@... [hp_agilent_equipment]" To: hp_agilent_equipment@... Sent: Thursday, October 15, 2015 2:06 PM Subject: [hp_agilent_equipment] HP-8566B, HP-8566A used without display
?
Does anyone have experience programming them with GPIB to make plots?
I'm wondering if that is a viable option since the displays are so old and fading... |
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Re: HP-8566B, HP-8566A used without display
开云体育Simmconn Labs has really nice LCD replacement kits if your display is fading. No financial interest, just a beta tester and happy customer! Steve On Oct 15, 2015, at 4:06 PM, John Griessen john@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
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Re: HP-8566B, HP-8566A used without display
Tom Miller
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Re: UPDATE on the HP-8568B SA's, Battery Time
Norman Thompson
Gedas,
For the battery.
remove the bottom cover of the RF unit.
undo the single screw holding the cover for the A15 board, remove
that board.
the battery is mounted on the A15 board
Suitable 3.6v lithium battery replacements are Tadiran TL-5104 or
Omnicel SL-760/P
Regards,
Norman
? Hello group. ?I have been able to purchase a 2nd HP-8568B SA unit, this one with the rear cables and with a HP-8444A (opt 059) tracking generator.? I was so happy to see that by swapping cables from one unit to the other, both 8568B's work just dandy, after the ovens warmed up. ?It amazed me at how close they both were in frequency and amplitude accuracy. ?I did however notice that one unit has a flashing "BATTERY" next to the cold oven indication while the unit warms up. I have DL'ed every doc I could find on these units but before I rip into them to find and replace the battery can someone save me some time by possibly knowing whether the required battery is in the top or bottom unit and if the battery is difficult to get to and replace? ?Also, what battery type is needed. Gedas, W8BYA |
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Re: Attenuators in HP/Agilent Infinium 548xx scopes
Peter Loron
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Re: UPDATE on the HP-8568B SA's, Battery Time
Hi Vladan and thank you very, very much for that information. ?You told me exactly what I needed to know. ?I was afraid that I would lose important system data or information w/o the battery and would have to go through some kind of reprogramming etc. ?I will get a new battery ordered ASAP and drop it in.
Then my next task is to connect up the HP-8444A TG to one of the units to ensure it works. And if so, sell both units. ?I hate to do so but I must as it will hopefully provide some needed income into the household. ?Thank you again ! gedas, W8BYA PS, for some reason I cannot reply to messages via e-mail like I used to be able to do and must log into the Yahoo group directly to make this post. ?It is weird as in some groups I am able to reply directly from e-mails and in others, like this one I cannot. |
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Re: UPDATE on the HP-8568B SA's, Battery Time
The battery is in the RF section (bottom box). In the "B" model, it's soldered into the processor board which is under a long, hinged sheet metal cover. I think it's the board with the green pull-out ears which will almost certainly crack when you try to pull it out. Try to pull it out without stressing the plastic handles.
You can actually see the battery before you pull the board out. Be careful with the ribbon cables when you re-insert the board. They can get pinched. The battery is a lithium AA size, but with leads. It's made by Tadiran. This is _not_ a rechargeable battery. It is available online and it seems to last approximately 15 years. The only thing you lose when the battery dies is the ability to store user settings. On the "A" models, the battery is behind the keyboard and it's a NiCd pack that usually leaks. Vladan |
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Dave McGuire
Michael A. Terrell
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