Re: Looking for HP alphanumeric display module 3 digits: 5082-7100 or 1990-0476
On 12/8/23 09:35, Raymond Domp Frank wrote: Ooohh! Please post pics of that when it's done.
Hi Dave,
My clock has been finished for a few weeks now. It works fine and uses Robert's replacement alpha module (5 x 7) for month indication.
It runs on a stable RTC, synchronised by a GPS signal, if available, which takes care of long-term accuracy.
I wonder if photos of it aren't too much off-topic in this HP equipment group but I do have a few to show. The displays are two different HP modules (10 ea. one-digit and 1 three-digit). That sounds great! Let me know if you're interested and if placement in an album in this group seems appropriate. Not really appropriate for this mailing list, but I'd love to see them. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: HP 16534A digital scope supported platform
Apparently not B&C models only, however if you would like to
upgrade your A to a C I have a kit of parts and instructions to do
that available.? The instructions are from HP they apparently
offer this as an official upgrade.
Paul.
On 2023-12-08 1:59 p.m., Bolgia
Alessandro wrote:
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Is it usable in HP16500A ?
Do anyone have the software module for this digital oscilloscope
board ?
Thanks
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HP 16534A digital scope supported platform
Is it usable in HP16500A ?
Do anyone have the software module for this digital oscilloscope board ?
Thanks
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Re: Another HP 3325a with hiccups
I guess I should add to Ed's and my post that?Vishay's M39006 capacitors are mil. spec. and claimed to be hermetic (which is why I chose to mention them), but AFAIK not glass sealed but sealed the same way as all other wet slugs that I know of and that Ed describes, i.e. using elastomer/PTFE sealing methods. They show the typical pinched waist of that construction.
Raymond
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Re: Another HP 3325a with hiccups
Raymond called it about right.
The main thing to remember is that either dry solid or wet Ta caps may be hermetically sealed, which is the premium package form. There are several brands, but I always remember these examples: The old Sprague 150D is hermetic dry solid, while the 109D is wet Ta, but NOT hermetic, using elastomer/PTFE sealing methods. These two are the ones I've encountered the most. The bestest, fanciest, and expensivest are the true hermetic wet Ta types, which can easily cost hundreds of dollars a pop for the larger sizes.
Ed
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Re: Another HP 3325a with hiccups
On Fri, Dec 8, 2023 at 04:29 PM, Jim Adney wrote:
I've always liked the Kemet 110 series, but I think any of the wet Ta caps, the ones with the GLASS seal at one end, are very good. The only problem with them is that they have become extremely expensive. I have a pretty good stash of them from swap meets, but I don't see them there much any more.
I suspect some common confusion, or please correct me if I'm wrong: Both Vishay 150D and Kemet T110 series are *solid*? tantalum capacitors, hermetically *glass-sealed*. Wet tantalum capacitors, like Vishay's M39006... are indeed *wet* inside tantalum capacitors. They often are about another order of magnitude more expensive than "ordinary" hermetically sealed solid tantalums. Applications are (often) higher reliability and especially, higher WV than the solid variety. All wet tantalums ("wet slugs") that I've seen exhibit a strongly pinched positive end ("narrow waist") and a silver (not just silver or tantalum coloured)? body. Solid tantalums have a tantalum (greyish) body. Raymond
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Re: Another HP 3325a with hiccups
On Thu, Dec 7, 2023 at 01:19 PM, Ed Breya wrote:
Oops - I meant to say "150D" style Ta caps, not 105D
I've always liked the Kemet 110 series, but I think any of the wet Ta caps, the ones with the GLASS seal at one end, are very good. The only problem with them is that they have become extremely expensive. I have a pretty good stash of them from swap meets, but I don't see them there much any more.
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On 12/8/23 09:59, Wayne via groups.io wrote: Thanks for hosting this!? Fantastic collection, very nicely presented. Thanks Wayne, please feel free to add to the material that's there. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Dave,
Thanks for hosting this!? Fantastic collection, very nicely presented.
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Re: Looking for HP alphanumeric display module 3 digits: 5082-7100 or 1990-0476
On Mon, Nov 13, 2023 at 02:07 AM, Dave McGuire wrote:
Ooohh! Please post pics of that when it's done.
Hi Dave, My clock has been finished for a few weeks now. It works fine and uses Robert's replacement alpha module (5 x 7) for month indication. It runs on a stable RTC, synchronised by a GPS signal, if available, which takes care of long-term accuracy. I wonder if photos of it aren't too much off-topic in this HP equipment group but I do have a few to show. The displays are two different HP modules (10 ea. one-digit and 1 three-digit). Let me know if you're interested and if placement in an album in this group seems appropriate. Raymond
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Re: Another HP 3325a with hiccups
Oops - I meant to say "150D" style Ta caps, not 105D.? Ed
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Re: Another HP 3325a with hiccups
I recently fixed a 3325A, twice in a row, that had failed Ta caps on the output board. After the second one went, I decided to change all of them on that board to hermetic type 105D, and it has worked fine since. The original caps were the yellowish tan plastic molded chamfered bullet style Ta. All the Ta the ones on the other boards are 105D anyway, so good to go. I don't know why this board is different, or if all 3325As have the same parts arrangement, or if it has changed over the years and generations. Once you look inside, you'll see what the deal is.
Look first at the +/-15V supply ones, which are most likely to fail. This board is quite open and labeled well and easy to probe around from the component side.
Ed
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Hey folks, recent off-list discussions have prompted me to remind you of HPWiki:
Patterned after the amazingly useful TekWiki, it's intended to be a group effort and a resource for all of us. HPWiki is currently pretty small, but so was TekWiki when it was young. I'd like to encourage you to contribute to this effort by adding instrument pages (see the Contribution Guidelines), documentation, photos, etc.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
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Re: Another HP 3325a with hiccups
? ? Thank you for the suggestions and confirming my ‘uninformed’ suspicions I will start checking the PSU over the holidays and reply with the results ? Many thanks /Richard B
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Re: Another HP 3325a with hiccups
Hi Richard,
Check out the service manual available on Keysight's website. Page 8-O-1 describes how to isolate the source of the fault.
As Jared mentioned, the fan is powered by mains but the relay that enables it uses the rectified output of CR1-4 used by the +5V supply. So at least that much remains working :-)
The +5V supply uses CR10 as an over voltage crowbar but it would shut the fan down if it triggered. +5, +15 and -15 all have independent current limiting mechanisms on the power supply board which rely on the rectified output of U1. But U1 is a full wave bridge rectifier which is unlikely to fail regularly after 2-3 minutes. That sounds like a slight over-current issue tripping a thermal limit of something.?
Once you follow the isolation steps from page 8-O-1, let us know the results.
? Hello to group ? My HP3325a synthesizer has developed a strange affliction ? I turn it on and all is well for about 2 ? ?to 3 minutes. It then shuts down dead except for the fan. I turn it back on, all is sell again for a few minutes and it shuts down dead, except the fan. While operational, all self tests pass ok. ? Once in a while, as it shuts down, the display flashes and the relays click as if trying to reboot. ? Any suggestions on where to start looking would be gratefully welcome. Power Supply?? ? Many thanks Richard B ?
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Re: Help figuring out my 8648C Signal Generator?....
I have only briefly dabbled in FreeCAD a few years ago, but barely even used it. My muscle memory in Rhino is too strong. :D
As for the front panel, it looks like the part is rather expensive to get made even in China due to its size..
So, if anyone has a front panel to suit the LCD type display, I'm interested! I don't actually need the dials, LCD, PCB, Buttons etc so you can keep them for your own spare parts, I just need the aluminium frame itself.
I think any of B/C/D models will be fine. (A version has different text on the output jack), as long as it's from the LCD display version as the window in the mylar overlay is a different size.
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Re: Another HP 3325a with hiccups
I believe the fan is run from the mains voltage, so it won't be affected by a faulty PSU.
But the PSU is where I'd be looking first, it's a pretty simple circuit. I'd check capacitors aren't failed, and also current draw/voltage on each rail to make sure something like a shorted tantalum or other fault load isn't pulling the rails down and causing the PSU to shut down.
Jared
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Another HP 3325a with hiccups
? Hello to group ? My HP3325a synthesizer has developed a strange affliction ? I turn it on and all is well for about 2 ? ?to 3 minutes. It then shuts down dead except for the fan. I turn it back on, all is sell again for a few minutes and it shuts down dead, except the fan. While operational, all self tests pass ok. ? Once in a while, as it shuts down, the display flashes and the relays click as if trying to reboot. ? Any suggestions on where to start looking would be gratefully welcome. Power Supply?? ? Many thanks Richard B ?
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Re: HP 8116 doesnt reach 50MHz properly
Yes, the HPAK method of model numbering got you.? HPAK uses A for the first version released, while Tektronix has no letter on the end for the first version, and uses the A for the second version released.? ?Confusing!? ? ? ? ?Jim Ford
Sent from my T-Mobile 4G LTE Device
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-------- Original message -------- From: Augusto <aadm72@...> Date: 12/6/23 1:13 PM (GMT-08:00) Subject: Re: [HP-Agilent-Keysight-equipment] HP 8116 doesnt reach 50MHz properly
Mark, >I assume you mean 8116A (not 8116). Correct I have tested again in a better setup and the results are fine. The adjusment procedure it will be enough. I used a 50 ohm termination but my interconect cable was not OK. If I have more problems i will post some screens.? But for now i have a HP141 over the bench to change a potentiometer and check the contacts in a switch. Thank you Mark. Augusto
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Re: HP 8116 doesnt reach 50MHz properly
Mark,
>I assume you mean 8116A (not 8116).
Correct
I have tested again in a better setup and the results are fine.
The adjusment procedure it will be enough.
I used a 50 ohm termination but my interconect cable was not OK.
If I have more problems i will post some screens.?
But for now i have a HP141 over the bench to change a potentiometer and check the contacts in a switch.
Thank you Mark.
Augusto
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Dave McGuire
Jared Cabot
Augusto