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- HP-Agilent-Keysight-Equipment
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Re: HP 1715A Vertical Position Problem
Dick,
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Sorry to report to you that the 171x & 172x series seems to have had a problem with that "chip". I have 2 1720A's & 1 1715A on the shelf ith the same problem and no resolution. All of the scopes respond fine when the chip is replaced with a known good one and I haven't been able to find a source for them. (other than donor scopes) Regards, Warren The first clue is that the Vertical Position only causes about 1/2 cm deflection. I checked the voltages on P5 and get a +15 to -15 swing |
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Re: Thanks ....John .....54110 Id is up and Running
Terry,
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No problem!! It is a great group. I like to give back when the opportunity arises. I have quite a bit of experience with the 54111D and 54112D which are similar. These scopes do not have the same input plugins that the 54110D has. You were lucky, with the power supply. I have seen a few with the control chip blown. HP used a custom designed Power supply chip in these scopes. Regards, John ---------- Original Message ----------------------------------
From: Terry Oleksy <tloleksy@...> Reply-To: hp_agilent_equipment@... Date: Sun, 7 Jan 2007 17:22:07 -0800 (PST)
________________________________________________________________ Sent via the WebMail system at aztec-net.com |
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Repair of Legacy (1970s) HP equipment
Robert Hagenbach
Hi,
I have the following HP test equipment that needs repair: 1) HP 8556A Spectrum Analyzer LF Section 20 Hz to 300 kHz - frequency sweep is nonlinear. 2) 8553B - Spectrum Analyzer RF section 100kHz to 110 MHz - 0 dBm input gives -40 dBm reading. Both pieces were tested with a known good HP 8552A Spectrum Analyzer IF Section Does anyone have any recommendations on companies that does repair of Legacy HP test equipment? The local phone book and a Google search did not help. I would like a company in Florida, preferably Tampa/St Pete area. Heck, I would even consider a ham that someone trusts! Bob Hagenbach Largo, Fl |
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Thanks ....John .....54110 Id is up and Running
John
Thanks so much for the PDF files, was able to locate problem, C12 had very high ESR problem. I had missed it when I had first tested the Caps before having the info you where so kind to send. The data you provided led me back to that circuit. Now all I need to do is learn how to operate this sophisticated peace of equipment. You and others may want to mark your power supply diagram, C12 doesn???t appear to have been a good quality cap to begin with. Thanks again for your kindness. T.O. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around |
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Getting 8505A working
I have the two units but no cables. They power up but nothing appears
on the CRT. Tip: there is a switch at the rear of the CRT section that permits it to power up as soon as it is plugged in, and in the other position it slaves the turn on from the power switch on the frequency control unit (remove the 2 "legs" and undo one screw to remove the cover. You cannot see the filament in the dark so don't assume a bad CRT). I make individuals patch wires with pins on the ends and jumper all 17 of freq control to signal processor connector. Now I get a trace and most controls seem to do something and I get the power switch to control both units. So this cable is needed to check the CRT. The trace is noisy and the counter does not make much sense giving an overlflow display. I next patch the 5 coax using individual coax with the correct coax connector inserts from some scrapped junk. However I only have 3 so the last 2 I use connector sockets and hook up wire (no coax). Nothing impressive happens on the display. I can turn on all 5 markers and move them on the display but the counter does not make any sense, shows overflow, and shows frequencies out of the scan range with no relation to the markers on the screen. Tip: to see the markers you must turn down the intensity of the CRT to faint. They show as diamond shapes. It looks like my analyzer might be worth some more investment. I search for manuals and find Artecmedia have a complete set on CD. I have dealt with them before and they have high quality scans. I order a set for $25. I find www.glkinst.com sells cables and www.cinchuk.com/dsubd6.htm has connector bodies and pins and coax inserts. So I can make them or buy them, I will think on this. Until my manuals arrive can someone tell me if there should be lights on the source/converter (mine is dead). What is a simple test hookup with say a 60MHz low pass filter? Any comments on the counter? I hope this will help others in getting their analyzers going. |
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HP 1715A Vertical Position Problem
Richard W. Solomon
I picked up a 1715A that has a problem with both Vertical Inputs.
Since the problem is the same on both, I suspect the common Vertical Amplifier section. The first clue is that the Vertical Position only causes about 1/2 cm deflection. I checked the voltages on P5 and get a +15 to -15 swing there from both pots. I suspect something daffy in that ceramic substrate but not sure. I removed it and cleaned the contacts with alcohol but it did not fix the problem. Any hints on what to look for next ? Thanks, Dick, W1KSZ |
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Re: LOGSA AND IE-7 ???
On Fri, Jan 05, 2007 at 02:11:33PM -0500, J Forster wrote:
Geoff Blake wrote:I worked at DG for the engineer who devised this circuit (when I worked for him he was then a division VP of R&D and it was some years after the circuit was implemented) and can confirm it was real and deliberate and conscious and sanctioned at the highest levels of the company. It was part of a rich folklore of similar stories about DG's competitive practices in the very early days that allegedly included kerosene cans... It is interesting that two of the folks who are taking over for Mr. Gates at the helm of Microsoft also worked with me in the same R&D group under the same boss (who designed this circuit). I'm not sure whether either of them ever heard this story from the horse's mouth so to speak, but they might have. -- Dave Emery N1PRE, die@... DIE Consulting, Weston, Mass 02493 "An empty zombie mind with a forlorn barely readable weatherbeaten 'For Rent' sign still vainly flapping outside on the weed encrusted pole - in celebration of what could have been, but wasn't and is not to be now either." |
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Upcoming Scrounge, Southern Cal.
This is being posted to: TekScopes, HP, TestGear, and CCTech lists.
Fellow techies, I'm going to have a day or so of opportunity to do some serious scrounging in the southern California region, specifically around Anaheim and vicinity, coming up in May of this year. Being that I haven't been near the area since 1993, I could really use some pointers on who's who in the electronic surplus arena that would be worth a look. My primary interests are in test gear (usually RF and telecommunications, but I keep an open mind), specialized hand tools for connector crimping (both mil-spec and commercial), and "legacy" telephone equipment from the Bell System/Western Electric heyday. So... Let the suggestions fly! ;-) Thanks much. -=-=-=-=-=-=-=-=-=-=-=- Bruce Lane, Owner & Head Hardware Heavy, Blue Feather Technologies -- kyrrin (at) bluefeathertech do/t c=o=m "If Salvador Dali had owned a computer, would it have been equipped with surreal ports?" |
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Re: 54110d
Thanks James,
I was hopping to find someone that may have run into a similar problem. I hate paying for service manuals that don't include data for the most important element of any equipment The POWER SUPPLY or photos that are unreadable. My grand kids could have done better with crayons. Back in the days when Motorola came out with the Quasar, (a modular system ) they still provided schematics for troubleshooting. A technician could continue to learn and be more than a module changer. Sorry, enough Venting. Do you know if the schematic and photos are any better on the $25.00 manual you mentioned. T.O. |
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usb_gpib Adapters
Paul_group
Hello
I wonder if anyone has had success using Intuilink / Excel with a none HP usb_gpib adapter. I have comms with my instruments using the test application that came with the lead but now need to be a bit more adventurous. I'd be grateful for pointers from anyone who has been down this track before. TIA Regards Paul -- 73 de Paul GW8IZR IO73TI |
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Re: 54110d
Pat,
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A good place to start is the agilent website. They have made available 100s of manuals for obsolete equipment. The 54110D manual is available at: This service manual does not contain schematic, but it does contain some detailed troubleshooting information. The schematics are available from: www.artekmedia.com You need to get: 54110D $25.00 (3 Vol. Set, Oper., Pgmr., FRU service, Ext Service) Even with this there may not be any schematics for the monitor assembly. I have a 54111D and I believe that the monitor assembly was purchased as a component. I hope that this helps. Regards, John Barnes VE3XRY ---------- Original Message ----------------------------------
From: "tloleksy" <tloleksy@...> Reply-To: hp_agilent_equipment@... Date: Sat, 06 Jan 2007 05:18:48 -0000 I'm in need of help with my HP Agilent 54110D 1GHz scope ¡ No Video ________________________________________________________________ Sent via the WebMail system at aztec-net.com |
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Re: HP8620C / HP8621B
Geoff Blake schrieb:
Hi Geoff, I have a 8621B plugin that does not work. So I'd like to find that manual. Not urgent - but would be nice to have. Also have plugin without manuals: **HP86220A 10 - 1300 MHz HP86241A 3,2 - 6,5 GHz** and these modules for the 8621: **HP86320A 0,1 - 2 GHz HP86330A 1,8 - 4.2 GHz HP86331A 1,7 - 4,3 GHz HP86342A 5,9 - 9,0 GHz HP86350A 8 - 12,4 GHz If you could find anything it would be very nice. vy 73, Rainer ** -- VHF/UHF/SHF Online Toplist: DF6NA Homepage: Amateurfunk-Flohmarkt: VHF-DX.net: |
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Re: INPUT RC NORMALIZER
you can measure scope input capacitance using a capacitance meter or bridge
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just remember to take the capacitance of your test leads or coax into account. i normally just measure the capacitance with the test coax disconnected and then with it hooked up the 1m ohm resistor shouldnt change the reading significantly. thats what the 130 lc meter was designed for . ive seen them used as general purpose measuring devices too. as you know the compensator will act as a 2x attenuator when driven from a low impedance source. you should terminate the pulse generator before the coax enters the compensator "i think" ----- Original Message -----
From: Geoff Blake To: hp group Cc: tekscope group Sent: Friday, January 05, 2007 11:24 AM Subject: Re: [hp_agilent_equipment] INPUT RC NORMALIZER On Fri, 5 Jan 2007, Geoff Blake wrote: > The input normaliser is a series 1M ohm / 47pF capacitor placed in > series with the scope input. It should be as close to the input as > possible. There should be no coax between the input and the > compensator. The 47pF is normally something like a 39pF plus a > trimmer capacitor to set exactly to 47pF. The Tektronix devices > use a chassis mounted male BNC with the C/R soldered to the pin. > > It acts as a potential divider and the input capacitance of the > scope is adjusted on an input squarewave, just like compensating a > scope probe. CORRECTION The series element comprises a 1.0 Mohm and 47pF in parallel, not as I wrote. I wrote that at work and was interrupted by about a dozen telephone queries as I wrote. It is thus: 47pF |-----||-----| generator o---| |---o to scope o----|---|--> |---/\/\/\---| | \ input 1M | / circuit = \ of | / 'scope | \ o--------------------o o----|---|--> Sorry for the error. Geoff -- Geoff Blake G8GNZ located near Chelmsford, Essex, U.K. Please reply to: geoff (at) palaemon (dot) co (dot) uk Using Linux on Intel & Linux or NetBSD on Sun Sparc platforms Please avoid sending me Word or PowerPoint attachments. See <> ---------------------------------------------------------- This E-mail and any attachment(s) are strictly confidential and is intended solely for the addressee(s). If you are not the intended recipient please notify <postmaster(at)palaemon.co.uk> and the sender by return and permanently delete the message. You may not disclose, forward or copy this E-mail or any of its attachments to any third party without the prior consent of the sender. ---------------------------------------------------------- |
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Re: RC Normalizers
maybe you can find some cheap chinese 10x probes that wili compensate to a 50 pf input
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maybe deane kidd has some older tek probes that have that much range you might be able to build a simple 10 x probe that would be good up to 5 or 10 mhz "heathkit sold probe kits for their early scopes like that" ----- Original Message -----
From: Jerry Massengale To: hp group ; tekscope group Sent: Friday, January 05, 2007 11:21 AM Subject: [hp_agilent_equipment] RC Normalizers Greetings, My thanks to all for the very instructive replies. At the moment SC501's are my immediate concern. I wonder if it might be reasonable to just use 47pf mica cap as the SC501 adjustment instructions call for 47pf with 1 megohm. Surface mount parts would be neat. I will build another with the trimmer for my other scopes. I have some Le Croy 9400's that have such a high input capacity(50pf) that none of my newer probes work with them. Newer probes like the lecroy PP001 and PP002 cause a display with severe leading edge roll-off. Jerry |
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54110d
I'm in need of help with my HP Agilent 54110D 1GHz scope ¡ No Video
but can see a brief flash as High Voltage enters CRT and when turning off. LED on first power supply board is lit but no other voltages present on any other test points. Have no service manual ¡.any help would be greatly appreciated. Thanks Pat |
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Re: 8620a / 86220a manuals
you have a spare 8620a manual to sell me?
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From: Rainer To: hp_agilent_equipment@... Sent: Friday, January 05, 2007 7:09 AM Subject: Re: [hp_agilent_equipment] 8620a / 86220a manuals I have the 8620a manual - looking for 86220a and HP8621B, HP86320A, HP86330A, HP86331A, HP86342A, HP86350A ! Rainer arthurok_2000 schrieb: > > does anyone have these manuals availible > > |
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Re: LOGSA AND IE-7 ???
J Forster
Traitors.
Thats what gets my goat, companies or individuals that sabotage, they should be treated as commercial and environment traitors and they should face prospect of jail ! This is not a new thing. In the 1970s, Data General introduced a Nova 2 mini with a potted power fail module that PURPOSELY caused randommemory failures if you did not use DG memory, then spread rumors that second It got quite a bit of notice. See, for example: -John |
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Re: HP8620C / HP8621B
Geoff Blake
On Thu, 4 Jan 2007, Geoff Blake wrote:
On Thu, 4 Jan 2007, Rainer wrote:Rainer,Hi,Hi Rainer, Sorry, I was mistaken, I thought I had the .pdf's you need, but they were for single band plug-in's, like the 86245A. If you are really stuck, I probably have paper copies. 73 Geoff -- Geoff Blake G8GNZ located near Chelmsford, Essex, U.K. Please reply to: geoff (at) palaemon (dot) co (dot) uk Using Linux on Intel & Linux or NetBSD on Sun Sparc platforms Please avoid sending me Word or PowerPoint attachments. See <> ------------------------------------------------------------------------------ This E-mail and any attachment(s) are strictly confidential and is intended solely for the addressee(s). If you are not the intended recipient please notify <postmaster(at)palaemon.co.uk> and the sender by return and permanently delete the message. You may not disclose, forward or copy this E-mail or any of its attachments to any third party without the prior consent of the sender. ------------------------------------------------------------------------------ |
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Re: LOGSA AND IE-7 ???
Traitors.
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Thats what gets my goat, companies or individuals that sabotage, they should be treated as commercial and environment traitors and they should face prospect of jail ! At 03:11 AM 6/01/07, you wrote:
Geoff Blake wrote: |
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Re: RC Normalizers
J Forster
I am certain that a 47pF Silver Mica capacitor would do, I think
that the effort of making a surface mount version would be overkill, just string the components across a BNC male/female pair in a small screened box and that will do. These boxes were available in a wide range of capacitances and were used to 'standardize' the input capacitance to enable probes to be switched between 'scopes (of the same input capacitance). Geoff Tek just uses an off the shelf ITT Pomona cast box, roughly 1" x 1" x 2", with M and F chassis mount BNCs on the ends and wired the R & C from center conductor to center conductor. Trivial. -John |
Bruce Lane
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