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Re: HP DVM / DMM technological history
Also the 3421A Data Acquisition Unit has voltage input terminals on the front panel IIRC.
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On Feb 17, 2016, at 2:39 PM, Jeremy Nichols jn6wfo@... [hp_agilent_equipment] wrote:
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Soldering recommendation
I have a challenging soldering job and am looking for advice from someone who's tackled something like it before.
I have a modern high-end device which has a complex and unobtainable custom LCD display. This display connects via a flex circuit to a connector on the main board. Unfortunately, the mechanical design is not great and where the flex circuit attaches to the LCD glass there is no strain relief so a couple of flexes and several traces broke. These traces are approximately 4 mils wide, spaced 4 mils apart. Under a stereo microscope I was able, using a new X-acto knife and VERY gently, scrape off the insulation on each side of the broken traces. I secured under the movable part with some cyanoacrilate. I now need to solder perhaps a wire across the broken traces. Using some surface mount paste (looks like BBs under the microscope) I managed to tin the traces but my soldering tip looks like I'm using a copper roofing iron, and that's after I sharpened it to what looked like a super fine point. Heck, at 40X even a pin looks rounded. #30 wirewrap wire is far too large but I did find some perfect wire strands from some superflex silicone RC wire. It reads 3.5 mils dia on my micrometer. So, this seems like a tough job but I did get one piece on after several tries. Has anyone who has successfully done something this have any pointers? Is there an iron meant for this kind of micro work? Things I should or shouldn't do? Peter |
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Service Training Mamual for HP 8566 / 8568
Would anyone have any interest in my Service Training manual for the HP 8566A/B and 8568A/B? This is NOT the service guide but rather a thick binder covering the circuit description with some schematics. This book was used during my service training at a two-week seminar at HP's Rohnert Park facility for these models.? Please contact me off-list if interested. $ 50 + $ 20 shipping Steve |
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Re: HP DVM / DMM technological history
¿ªÔÆÌåÓýDon't forget the 5265A Digital Voltmeter plug-in for the 5245-series counters!Jeremy N6WFO On 2/16/2016 6:00 AM, d.garrido@...
[hp_agilent_equipment] wrote:
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Re: HP8593A Power Supply repair
John
see msg# 67510 in the group messages..
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Regards John On 17-Feb-16 5:00:31 AM, newsong777@... [hp_agilent_equipment] (hp_agilent_equipment@...) wrote:Roumen,I would like to have a copy of the power supply schematics if it is possible. My HP8591A has the low 5.2 volt supply problem that others have mentioned. I am very experienced in this type of electronics and I would like to find a solution that is lasting and that I can share with others. |
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HP 3325A ROM Replacement
I thought I would summarize a somewhat meandering thread. I¡¯ve received the Artek manual and it is great!? It appears I do have a failing ROM IC.? As time went by HP changed from 4 4k*8 chips to 2 8k*8 chips and there is a way to jumper some boards to tell it which is installed.? (Joe: is that just the A/B jumpers near U5, or is it more than that?).? Apparently there are even some 3325a¡¯s with 3 ROM ics. The HP nano-processor only has 11 address lines for a 12 bit space and so they played games to extract the 12 bit.? In the 4-chip solution, each chip has 2 select pins which are used in such a way as to provide the top 2 most significant bits. Thus far, I have not found a 4k*8 EPROM or EEPROM that is pin-compatible with the original Synertek Sy2332/Motorola MCM88A332 masked ROM.? The TMS2532 are almost right, but lack the second select pin. [I keep seeing this listed even in historical literature as pin-compatible, but it is not according to the data sheets.? I¡¯ve seen this so many places that I wonder if the datasheets are wrong and pin 20 can be used as a second select.] The original 2-IC solution used the Motorola MCM68764C EEPROM.? A later version of that chip? is the Motorola MCM68766.? Joe has previously extracted the 2-IC ROM program.? I would guess that the 4-IC data is the same, just split between chips.? I also think the data is the same independent of options as otherwise the signature analysis info would have to change between machines, and it does not. My repair options include: 4 IC¡¯s.? This looks to require some extra glue logic to decode the second select unless a pin-compatible EEPROM can be found.? It would also require me to extract my data or split the existing 2-IC data. 2 IC¡¯s.? This only requires some jumper changes and the ROM program is already available. 1 IC solution.? Because the 3325a already decodes the 2 select pins as if they¡¯re address pins, this would only require a simple pin-remapping board for the new IC. Option B looks like the obvious choice except that I have so far only been able to find used replacement EEPROMs and I wonder about the longevity of those. I¡¯d also like to help the next person that needs to fix the ROM in a 3325a, and that argues for Option C.? Once option C is chosen almost any parallel ROM can be used and I¡¯m seeing some flash-ROM with a listed lifetime of 100+ years. Does anyone have a favorite 16k*8 EEPROM ic that is common and likely to be available for a few more years? |
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Re: 8590E Video Display problem
Depending on the model the 8590 series video displays have different horizontal sweep rates. The video displays are externally identical but the 8590A has a lower sweep rate (15,750 Hz?) than the 8590L and I assume your 8590E (19KHz?). A horizontal oscillator precision capacitor to set the free running value has a different value depending on the models.
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Someone may have swapped the display section not knowing this or your caps may have shifted values and you cannot sync up the displays until you "kick in the seat of the pants". Check the horizontal sync signal at the video display and then see if it approximately matches the free running oscillator value;. WB6IQS, John, Vista, CA -------------------------------------------- On Tue, 2/16/16, pbbob426@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
Subject: [hp_agilent_equipment] 8590E Video Display problem To: hp_agilent_equipment@... Date: Tuesday, February 16, 2016, 2:27 PM ?I have an HP 8590E in which there is no video on initial power up. But consistently, if I shut the 8590E down anytime after about 2 minutes and turn it again, the display is perfect - until the next cold start.? Anyone have any ideas what may be causing this? BobD |
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Free for shipping: HP 412A
Free for shipping ( We believe this thing will fit into a USPS large flat rate box ($26) to the lower 48: All electronic innards are there, including panel and meter and all panel switches. Outer case and carry handle in good condition . ?No tubes or test leads or front bezel. AC cord has been snipped off. Thank You Kiss Electronics Cornelius, Oregon Ms Ashley Hall W7DUZ |
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Re: 8590E Video Display problem
On 2/16/2016 5:27 PM, pbbob426@... [hp_agilent_equipment] wrote:
I have an HP 8590E in which there is no video on initial power up. ButBad cap somewhere...holding an address line down on a cold start ...then on a warm start the cap is feeling better and lets the address line come up faster -- Dave Manuals@... www.ArtekManuals.com |
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Date set for next Sphere Stuff Day/Ham Swap Meet
We will have tons of test equipment, (Tek, HP, Boonton, Fluke, PMI/Wavetek and much more) spare parts, plug-in modules, manuals and salvage units. Also tons of free electronic goodies of all kinds, as well as dirt cheap items, PLUS a wide range of ham gear and related items from ICOM to Collins for selling, swapping and testing. There is a lot of very cool stuff we are clearing out to make space, so whether you want RF parts, transmitting tubes, test gear, CRTs, nicads, scopes, meters, parts or what-have-you, you WILL find it here. There will also be solar panels, tons of high quality panel meters, Tek 11K items, time code systems (for that home launch pad you've been working on), and a huge assortment of crystals, filters and precision oscillator modules. Susan will also provide Visa/MC and Paypal services for payments if needed. Want
space to show and sell your gear, just CONTACT WALTER to reserve a
spot, strictly first come, first served. Trunk/truck sales are fine, or
you can set up a table, as you wish. We can provide power for some
locations, and we will have some interesting test gear to allow you to
demo and verify your stuff. YES,
we take requests for specific items you may be interested in, and YES
we will post a list in advance of some key items and prices for those
that just can't get up here, but shipping costs can be annoying for big
items, which is exactly why we suggest showing up in person.
Those that have been here in the past have had a great time, so we
invite you to drop by and snorkel through the goodies to your heart's
content. Plus, who knows what fabulous treasures others will bring to
trade? We may also be able to set up a BBQ spot for snacks, and we will have off-air frequency checks, RF power testing, and a master frequency reference to let you check your counters and other gear. Plus, lots of help and advice from a great cross-section of people you don't get to see so often. All in all, it should be a great time. RSVP if you need exhibit space, or just to say hi, and remember that we do take requests to set out just the items you need (we have 4 storage buildings, we can't set it ALL out). If you have been missing a good surplus store experience for a while, come by and get that taken care of here! Remember, Saturday, April 9th. I will post again as we get closer to remind you of the date. all the best, walter & susan (walter2 -at- sphere.bc.ca) sphere research corp. |
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Re: Weinschel step attenuator gets stuck
Tom, Afraid I don't have any help with this problem but a very warm welcome to the HP group. For those who don't recognise Tom's name and callsign, he is the brilliant designer of the DG8SAQ vector network analyser, VNWA. I built an early kit and have had?a lot of fun and learned much. With retirement coming up, I will have time to explore a lot more of the amazing functionality Tom has developed it?and continues to do so?with new software releases. I urge anyone with any interest in VNAs up to 1.3Ghz to check out the Yahoo VNWA group. Ian G3XYV |
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Re: Test Equipment where battery failure causes SERIOUS problems
Dr. David Kirkby (Kirkby Microwave Ltd)
On 16 February 2016 at 21:27, Dr. David Kirkby (Kirkby Microwave Ltd) <drkirkby@...> wrote:
Just to clarify, the extra hour was not for replacing the battery - the owner had already done that. The extra hour was for the fact every range needed zeroing and setting to full scale.? |
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Re: HP DVM / DMM technological history
Dave Brown
The 970A- I'm still chasing a battery pack for one- dead or alive (I just need the case)- but son has recently got a 3D printer- I smell success looming!
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Dave, ZL3FJ ----- Original Message -----
From: "'Mike Feher' n4fs@... [hp_agilent_equipment]" <hp_agilent_equipment@...> To: <hp_agilent_equipment@...> Sent: Wednesday, February 17, 2016 3:05 AM Subject: RE: [hp_agilent_equipment] HP DVM / DMM technological history I forget the nomenclature of the pen style red LED readout DVM. I had several and they were neat. Regards ¨C Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] Sent: Tuesday, February 16, 2016 9:00 AM To: hp_agilent_equipment@... Subject: [hp_agilent_equipment] HP DVM / DMM technological history Hello All, I am doing a bit of research to accomplish a comprehensive understanding of the DVM / DMM technology from the late fifties and early sixties into the 90's. I have come up with what I think is a list that covers the models I should be looking into. Are there any more digital meters that should be added? 405 2401 2402 3435 3440 3450 3455 3456 3460 3465 3490 Cheers, David |
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Test Equipment where battery failure causes SERIOUS problems
Dr. David Kirkby (Kirkby Microwave Ltd)
For many bits of kit, a battery is used to run a real time clock, and a failure is not a big deal. But for others it can be quite serious. It would be useful if we had a list of HP equipment where battery failures cause serious problems. Here are 1.5 entries. 1) HP 70700A digitizerSo if you have an 70000 series MMS with one of those, make sure the battery is replaced and done so without losing the data in SRAM. So a battery failure causes a loss of calibration data, and perhaps a higher charge to get a 3457A calibrated, since everything needs adjusting, not just the odd range which might be out of spec. Dr. David Kirkby Ph.D CEng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT, UK. Registered in England and Wales, company number 08914892. Tel: 07910 441670 / +44 7910 441670 (0900 to 2100 GMT only please) |
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Re: HP DVM / DMM technological history
Leon Robinson
I have a 405AR and a 970A. Also a Non HP Digitec Z-204B. ? Leon Robinson ?? K5JLR Political Correctness is a Political Disease. From: "d.garrido@... [hp_agilent_equipment]" To: hp_agilent_equipment@... Sent: Tuesday, February 16, 2016 8:32 AM Subject: [hp_agilent_equipment] Re: HP DVM / DMM technological history
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AH YES!!! The 970 tiny 3.5 digit handheld DMM. ?Was that the very first handheld? d the latest update: 405
2401
2402
3403
3435
3437
3440
3450
3455
3456
3460
3465
3470
3480
3490
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Re: HP DVM / DMM technological history
¿ªÔÆÌåÓýSpeaking of the 3478 (which I also have), is the 3468.? It¡¯s very similar to the 3478, but uses HP-IL rather than HP-IB.? (this was for use with the handhelds like the HP-41, HP-71 and the like). ? Daun ? Daun E. Yeagley, II, N8ASB ? From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: Tuesday, February 16, 2016 1:50 PM To: hp_agilent_equipment@... Subject: RE: [hp_agilent_equipment] HP DVM / DMM technological history ? ? How about the workhorse 3478?? Very popular and as low as $150 guaranteed working on eBay. ? PS: My stable of HP DMMs is a 3456, 3457, and 2 3478¡¯s. ? Regards, John K1AE ? From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] ? ? Hello All, ? I am doing a bit of research to accomplish a comprehensive understanding of the DVM / DMM technology from the late fifties and early sixties into the 90's. ?I have come up with what I think is a list that covers the models I should be looking into. ?Are there any more digital meters that should be added? ? 405 2401 2402 3435 3440 3450 3455 3456 3460 3465 3490 ? Cheers, ? David |
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HP/Agilent T&M Catalogs for Sale
I have all the HP/Agilent Test & Measurement Catalogs from 1985-2001 in excellent condition as well as 2ea 1989 (50th anniversary) catalogs in their original box. I worked at HP/Agilent in Baltimore & Philadelphia area so there is a personal history with these catalogs. Let me know if interested & can send pictures. Mike |
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Re: HP8593A Power Supply repair
Roumen, ????? I would like to have a copy of the power supply schematics if it is possible.? My HP8591A has the low 5.2 volt supply problem that others have mentioned.? I am very experienced in this type of electronics and I would like to find a solution that is lasting and that I can share with others. ??????We have a family friend in Burgas and relatives in Russia, we are in the US. ? Ted |
Jeremy Nichols