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Re: FS: HP8568b 1.5 Ghz Spectrum Analyzer with HP8444a Opt. 59 Tracking Generator
Jose V. Gavila
Hi Howard,
I reply on-list because of this comment: ... The HP8444a tracking generator is less common Option 59 that works withThis seemed extremely interesting to me, as I have a (I guess) less common 8444A with Option 058 (yes, it is not a typo; difference sems to be it only goes to 1.3GHz) so perhaps I could use it with the 8566A... but I guess you wanted to write 8558, right? Best regards, JOSE ------------------------------------------------- 73 EB5AGV - JOSE V. GAVILA IM99sm La Canyada - Valencia (SPAIN) Vintage Radio and Test Equipment RadioRepair BLOG European Boatanchors List Amateur Repairs List |
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FS: HP8568b 1.5 Ghz Spectrum Analyzer with HP8444a Opt. 59 Tracking Generator
Howard Ashcraft
I have an HP8568b that is in very nice shape electrically and cosmetically.
I purchased it from a professional calibration lab that was upgrading its equipment and was last calibrated by them in October of 2006. Since then, it has been in an equipment rack in my workshop. The HP8444a tracking generator is less common Option 59 that works with the 8568b. It is in good shape electrically, but there are a few scratches on the front panel that were probably made when someone removed stickers. I can send photographs if you are interested. Price is $1,000 for the pair (I am not interested in selling the tracking generator separately), plus packaging, shipping and insurance from Alameda, California. Better yet, if you are local you can save the cost and pick it up by arrangement and I will throw in a GPIB cable. Please reply off list. Howard Ashcraft |
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Re: HP 5326 counter repair question
Antonio
Fred,
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I have printed page 8-39 of the manual to see if I can help you. I think the most significant zeros being present in your Nixies have nothing to do with the -5V. It is probably caused by some logic fail in the display module. The schematic have two major sections: input switching and buffer amp. Input switching is done by relays K1 to K6 controlled by transistors Q1 to Q6. If I understand correctly -5V is read by a multimeter (assuming the (-) probe of your multimeter is on the black terminal), connected at the DVM input terminals. Now let's start some tests: Note that there is no -5V supply entering this board so their presence at the input can be a misleading symptom. What happens if you short the DVM input terminals? The first question is if -5V is present at ANY position of the DVM range (10V, 100V, 1000V) switch and the READ and READ B of function switch. If it is always present, I would simply pull out A12 and see if the display zeroes. If the display read near zero at this condition, the V to F (A13 board) and the remaining circuits can be considered good and the cause is really A12. First check continuity at pins 13 and 14 of the A12 card edge slot. This connection is the feedback path of the buffer and is completed at A13 (see schematic). If wrong it can lead to imbalance in the buffer stage and cause strange behavior. If O.K., check diodes CR2 and CR3. Short gate of FET Q7A to signal earth and put A12 back. The display should zero if buffer amp is operating correctly. If it zeroes search for some input-switching leak putting -5V in the input buffer. If the zero condition cannot be obtained shorting input gate Q7A to earth, the opamp is the probable cause (assuming all transistors measure good). In my case both Q7 and U1 were bad. Putting a new LM301A and substituting my burnt FETs by near identical IDSS discrete FETs restored the operation. The zero adjust trimmer R31, however, was unable to zero the instrument because of FET imbalance. Anyone knows about a reliable source of dual JFETs? Hope this can help you to troubleshoot you 5326B. Good luck! Antonio Falcao --- In hp_agilent_equipment@..., "fredschneider2001" <fredschneider@...> wrote:
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Re: 8673G
Had
Take a look at www.to-way.com
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At 10:28 AM 9/19/2009, you wrote:
Hi, |
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HP 16500A,B,C parts, 16515/16A pair
John Griessen
I figured how to swap a good monitor from a 16500A to a 16500C
after taking apart the A. No more dim view! 16500 Frame parts, odd screws, covers, strap, mainboard, touchscreen bezel/front panel assy, 3 or 4 of those projecting back side protector feet, power supply, card cage halves, floppy drives, blank filler card, fans -- are available cheap, (for a few days at least), via USPS from 78756 Austin TX. All the frame parts interchange between A,B,C. Not sure about the power supply -- different part number even though looks same. No bottom feet or boot discs though. Extra plugin modules: 16515/16A 1000MHz state/timing plugin pair with 32 coax probes $75 16510A LA 25MHz-state/100MHz-timing with probe leads but can't spare any probe ends $10 John Griessen |
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Very OT: Help on Staten Island, NY.
J. Forster
Sorry for the OT post, but a friened is in need of a small favor that has
to be done in person on Staten Island, NY. Background: My friend did a lot of data base work for a politician running for NYC City Council on Staten Island and the candidate refuses to pay her for her work. Repeated efforts to collect have been ignored, as have complaints to the appropriate NYC authorities. It has come down to filing a law suit. The favor: Attempts to get the forms for filing a lawsuit pro se (w/o a lawyer) have to be PICKED UP in person at the courthouse, 527 Castleton Ave., Staten Island, NY 10304. What is needed is the form to file a suit pro se and the instructions that go with it. If anybody is willing to pick up the form and instructions and mail them to me, it'd be most appreciated. Please contact me off-list. TIA, -John |
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Re: HP 8662A parts needed
J. Forster
Can't help you with parts, but NiCds have Potassium Hydroxide in them, a
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base, not an acid. You use a mild acid like vinager to clean it up. -John ===================== Hi Group, |
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Re: HP 8662A parts needed
David C. Partridge
I can help with 1990-0540 but not 0330 - don't know difference I'm afraid.
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Dave -----Original Message-----
From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of macurlis Sent: 19 September 2009 11:14 To: hp_agilent_equipment@... Subject: [hp_agilent_equipment] HP 8662A parts needed Hi Group, <snip> Also it seems to have some failed LED modules, does anyone know if they are still available? Corrosion may have killed these aswell. I think they are also used in the 8640B. HP part nm. 1990-0330 Matt |
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182C CRT access
Hello all,
I can't figure out the steps needed to access the front glass plate of the CRT on a 182C display. I need to clean all the plastic covers AND the CRT front plate. I guess I need to remove the front plate of the instrument, but how? Can anyone tell me the needed steps? Thanks in advance and best regards Francesco IZ8DWF |
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HP 8662A parts needed
Hi Group,
I've nearly completed rebuilding a 8662A that was in a horrible state. The nicd pack had exploded long ago and the fan had helped the corrosion spread all around. As well as that it was caked with dust worse than any instrument i've seen. Anyway after stripping, washing (!) and fixing corrosion related issues it basically works. The only thing which is beyond repair is the front-left sweep panel, the battery acid seems to have eaten the lettering of the panel. So is there anyone out there who has a donor unit with a this panel? I'd even be happy with fairly average one. Also it seems to have some failed LED modules, does anyone know if they are still available? Corrosion may have killed these aswell. I think they are also used in the 8640B. HP part nm. 1990-0330 Matt |
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Re: sliderule
im 52 and had to memorize the multiplication table in grade school
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older engineers from the non digital world liked to approximate everything. and many things were designed very conservatively with large safety factors. my late father who was an ee believed in the muntz tv method of design optimization "remove parts and stages until it stops working then add parts to restore reliable operation" he died a long time ago but his electrical and mechanical designs that i saw were conservative he had a habit of doing things quickly and simply arond the house. but knew how to be a perfectionist. "like at work" his slide rule was a ke versalog my older brother who is also an ee lost it i still have its rerplacement a newer "hemi" leather cased versalog. i used a simpler sliderule in high school and a corvus that was a copy of an hp initially in college lately i use some cheapy casio scientific calcs. "i also own an hp 50 and ti86. i never finished my ee . ----- Original Message -----
From: d.seiter@... To: hp agilent equipment Sent: Saturday, September 19, 2009 2:27 AM Subject: Re: [hp_agilent_equipment] sliderule I agree, but I can't measure up. My father was a pipeline engineer for Bechtel (and I hate it when people pronounce the name like it's a telecom company with a hard -TEL), and could multiply any 2 3digit numbers in his head almost as fast as I could using a calculator. I still don't understand how he did it. I know I missed the math gene almost completely! -Dave ------------------------------------ Slipsticks and quick mental calculations impress the younger generations enormously, the latter is not a good sign. |
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Re: sliderule
I agree, but I can't measure up. My father was a pipeline engineer for Bechtel (and I hate it when people pronounce the name like it's a telecom company with a hard -TEL), and could multiply any 2 3digit numbers in his head almost as fast as I could using a calculator. I still don't understand how he did it. I know I missed the math gene almost completely!
-Dave ------------------------------------ Slipsticks and quick mental calculations impress the younger generations enormously, the latter is not a good sign. |
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Re: sliderule
I'm very bad in Math, but i like it very much (strange don't you think :-) ). I tried to understand the log-thing because my hobby about network analysers (and the dB, where it all is about) but no succes, I knew which button to push on my valculator but that's it. After an afternoon playing with the virtual slide rule and reading the instructions I now finaly get it about logarithm. It's not something to make math more difficult or a problem found for a solution there was before :-) This is just a very clever thing to make live more easy. I'm rather visual, a calulator is not visual but the slide rule is. (I do not know if it's clear what I mean but I hope you get the picture)
I begin to love them more allready.. Very nice to read my questions bring back happy memory's to a lot of readers here. (I also begin to think I'm one of the youngest here) Fred |
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Re: sliderule
Hi all,
This is a great thread. I'm 60 and when I was in high school they were strictly forbidden in scientific mathematics classes as they were only for "arithmetic". We were encouraged to use the necktop as often as possible, something I value to this day. When I went to university of course every engineering student had one. I still have my Faber Castell bamboo 1/98 Electro which is as smooth as the day it was made although the scales have yellowed. I also have one or two little no name plastic ones which I use occasionally in the workshop. I had a big FC log-log decitrig plastic one years ago but it warped after being left in a car in the Aussie summer. Slipsticks and quick mental calculations impress the younger generations enormously, the latter is not a good sign. Cheers, Morris VK3DOC |
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Re: HP Application Note 136
John Miles
All you have to do to find this and most other app notes is go to
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and type in "AN 150-2". Other documents that aren't already online should be uploaded to the manuals page at . It should be fairly obvious to most by now that attachments don't work on Yahoo groups... -- john, KE5FX -----Original Message----- |
Pierre-Fran?ois (f5bqp_pfm)
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