Labguy <georgg@...> added folder /HP85081A
The following files and folders have been uploaded to the Files area of the [email protected] group.
By: Labguy <georgg@...>
Description:
HP85081A Ops and Service Manual
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Re: WTB Red front panel window for 5335A, 05335-20201
A few years later and I noticed this 5335A still sitting on my shelf, so I'm still looking for the window (or two) and a few of the little black clips.
Plus a power button cap if someone has one of those too.
Thanks!
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Re: Help figuring out my 8648C Signal Generator?....
Hmm, that front panel model is impressive! Perhaps I should revisit
Rhino, I looked at it many years ago (>14) but just couldn't seem
to get my head around using it as a 'parametric' 3D CAD, somehow I
couldn't engage with the process/workflow back then. Anyway 'someone
else' was paying for my SolidWorks dongle back then too!
Like John, I've been using FreeCAD a lot for the last 2-3 years and
it is pretty capable *but* for the well known 'TNP' or Topological
Naming Problem' issue which causes models and assemblies to self
destruct before your very eyes, seemingly at random at first, while
not insurmountable it drives most people - me included - totally
nuts and can double or triple the time taken to develop both
individual models and assemblies, especially when one is in the
iterative stages of developing a new product!
For producing a model of a totally defined part such as that panel,
TNP is not really a problem once you (finally!) get to grips with
how to avoid it biting you.
There is hope however, a solution to TNP based (I think?) on the
'RealThunder' branch of FreeCAD is being actively incorporated in
the main release but I believe it's still a little way off.
On 04/12/2023 01:39, Jared Cabot via
groups.io wrote:
toggle quoted message
Show quoted text
Ha ha, I've been using Rhinoceros 3D for about 20 years now. I'd
consider myself 'ok-ish' at it. Just hobby use but I can usually
get done what I need with it.
I might be open to helping design some small stuff. I already do a
little electronics product design work on the side, so I'm sure I
can handle a little bit more here and there.
Jared
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Re: HP 83550A service manual needed
Hello Bruce,
Did you get any copy of the service manual in the end? My plug-in is acting strange and I also need the manual.
Thanks,
Razvan
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File /All HP, Agilent and Keysight instruments in folders by part numbers/8000 to 8999/8405A Vector voltmeter/8405A-8A - Service Note.pdf uploaded
#file-notice
The following files and folders have been uploaded to the Files area of the [email protected] group.
By: Wolfgang Schraml <wschraml@...>
Description:
"APC Unlocked" Indicator Light Replacement (Serial Prefix 2014A and Below)
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Re: Help figuring out my 8648C Signal Generator?....
Ha ha, I've been using Rhinoceros 3D for about 20 years now. I'd consider myself 'ok-ish' at it. Just hobby use but I can usually get done what I need with it.
I might be open to helping design some small stuff. I already do a little electronics product design work on the side, so I'm sure I can handle a little bit more here and there.
Jared
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Re: HP 8350B plug-in external ALC help
Hi, Tony (and everybody else interested in leveling loops).
Take a look at this article by Diskus.
I have two 8350Bs, an 83592B (10 MHz to 20 GHz plug-in), an?83590A (2 GHz to 20 GHz plug-in), and a 432A power meter, but I haven't tried Diskus' methods myself (yet).
Good luck!
Jim Ford Laguna Hills, California, USA
"And we know that God causes all things to work together for the good of those who love God and are called according to his purpose for them." Romans 8:28 (NLT)
------ Original Message ------
Date 12/3/2023 5:42:08 AM
Subject [HP-Agilent-Keysight-equipment] HP 8350B plug-in external ALC help
Hi,
I want to experiment with external
leveling if my 83595A plugin using an external ALC source. I plan to use my 432A power meter which I know is compatible.
The manuals seem to be rather ?thin on details about how to set this up (the 8350B local operating guide refers to it, and explains in detail how to configure just about every instrument except the 432A!) - and so I¡¯m wondering if anybody knows of a good reference/tutorial that I can read?
I¡¯m assuming I need to sample the RF output with ?a coupler, detect it, and then feed it back.?
But some instructions to prevent me from blowing something up by accident would be reassuring!
thanks
tony
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HP 8663A Generator PSU - Inverter transistor (modern) equivalents?
Picked up an 8663A labeled "Dead" on a flea market.
Not to expenceive and I was willing to risk the money.
The fault was located to the inverter where one of the inverter power transistors
along with a 22uF capacitor (15 in the chematics) was broken.
Luckily, I had a couple of BUX48 in my junk box with close enough specifications
compared to the two MJ16012 originally used. After replacing the capacitors,
changing the bleeder/balancing resistors to 18k the unit came back to life.
MJ12016 as well as BUX48 is obsolete since a long time. Anyone having
repaired this design using available bipolars and can share information
about what can be purchased today?
Cheers
Ulf Kylenfall
SM6GXV
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Re: 11807E Radio Test Software on PCMCIA Cards for the 8920B
I use an very old Sharp laptop with Windows 98 and Elan's Memory Card Explorer. Unrtunatly Elan went out of business soit's hard to find. It took me a long time to sort out the many wrinkles in getting a working solution. It's still very hard to identify suitable flash cards and new ones are getting very expensive.?
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Re: HP 8116 doesnt reach 50MHz properly
I assume you mean 8116A (not 8116).
The 8116A can make it to 50MHz.? But it has a specified rise/fall time of <7ns (I measure 5.6ns on my unit), so this will make square and triangle waves look like sine waves by the time it gets to 50MHz since it's spending the majority of the time transitioning.? At 50Mhz I also have some minor reduction in peak-to-peak levels (like 10-20%).
Are you using 50 ohm termination on your scope to view the output?
Unless what you're seeing is severely distorted, a lot of this can be tweaked with adjustments, but having done the adjustment procedure a couple of times I can say it's a bear to get it right.? Many potentiometers are overly sensitive to movement, some adjustments interact with each other, and most are a compromise of what looks least bad.? Be prepared to spend the better part of a day.
Can you post some screen captures/photos of the 8116A settings and waveforms you're seeing?
-mark
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Re: Help figuring out my 8648C Signal Generator?....
On 12/3/23 11:16, Jared Cabot via groups.io wrote: And also drew up the front frame too which I'll get made in aluminium in China if Wow! Are you for hire if I need an electronics enclosure designed? Which CAD do you use? I've done some with FreeCAD... -- John Griessen -- building lab gear for biologists Albuquerque NM blog.kitmatic.com
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Re: Logic Analyzer isolation adapters - HP 01650-63201 vs HP 01650-63203
I recently checked the difference between the 01650-63201 and 01650-63203, and it turns out the -01 does not actually put +5V on pin 1 and 2. They truly seem to be N/C from the pod-side. However, it does connect pin 1 and 2 together like a jumper.
So this explains the mentioned warning in the training kit, but it is worth noting that the warning is independent to the context of the preceeding paragraph about how to power the board in the first place.
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Re: Help figuring out my 8648C Signal Generator?....
And I got a little carried away again...
I drew up the rear handle/foot (08647-40003) to replace the missing part on mine and uploaded the file to thingiverse in case someone else needs one.
And also drew up the front frame too which I'll get made in aluminium in China if I can't find a replacement from a scrapped instrument for a decent price.
I'm 99% confident that it will fit perfectly, but that means it probably won't first time and will need a tweak. :D
Jared
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Re: HP 8350B plug-in external ALC help
The 83592A manual page 3-16 shows the power meter recorder output (0V at zero input, 1V full scale according to the HP 432A manual), directly connected with a BNC.
Page 8-28 under the heading of A4 ALC assembly mentions an inverter circuit for the power meter j out. This makes sense when considering the internal ALC has a negative detector diode.
Page 8-94 mentions crystal detector voltages of -10 to -200 mV and power meter inputs of 0-1V range.
It mentions signal routing when [MTR] power meter is selected.
Plug in a BNC cable to the recorder output. Hit the [MTR] button to select power meter ALC.
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Re: HP 8116 doesnt reach 50MHz properly
Thank you!
I will let to warm up, didn't pay attention to this.
Best Regards
Augusto
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Re: HP 3325B repair, help needed with Schottky diode
Tom,
now it is clear. But with anode and cathode reversed in Your first description, I could not follow.
And I was ables to complete the repair, I looked in a for-parts HP 3764A, a digital transmission analyzer, I think for T2 lines or so, which I will never need.
It has plenty of 1901-0518 Schottkys in it, and some other, similar ones.
Took two, and replaced CR3 and CR4 both.
Sidebands on the spectrum analyzer look good, but did so also with a 1N4148. Maybe it is not so critical.
Thanks for all the help.
Peter
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Re: HP 3325B repair, help needed with Schottky diode
If my memory isn¡¯t faulty, the 5082-2810 was a diode usable as a mixer diode up to perhaps a gigahertz or two, rather than something you¡¯d use in say a 1N914 or 1N4148 application.
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Re: HP 3325B repair, help needed with Schottky diode
Hi Peter,
I'm using the 3325B service manual on Keysight's website from March 1990. Specifically the schematic right after page 8-F-4 which is Figure 8-F-2 Fractional N Analog A21 on PDF page 130. CR3 and CR4 are facinging each other at the end of the Phase Comparator and Integrator. I did get Anode and Cathode reversed. The cathodes connect while the anode of CR3 connects to Q3 of the Phase Comparator while CR4 anode connects to several things including R71 from the Integrator.
For CR3, the anode connects through Q3 and Q4 as you say. The most direct route to power is the collector-emitter junction of Q3 to?+5V (I called it?+15V as my copy is very hard to read).? Q3ce does have a resistance but in the worst case (failed transistor) it will be a direct short to +5V. The most direct path to power for the cathode of CR3 is the source-drain junction of Q18 (I think) but that is only?+V which CR3 will block. The next best route is through the source-drain junction of Q10 (I think) and then through the dual collector-emitters of U2A then U30A (another guess) which is a 1150 ohm resistor to -15V. So the worst case looks like?+5V -|>|---/\/\/\/\--- -15V. That is 20V across 1150 ohms or 17.4mA. To calculate the power dissipation across CR3 (not the power flowing through CR3 which is 20V * 0.0174A or 348mW) we need to know the voltage drop from 17.4mA at the operating temperature of the diode in the worst case scenario. This is different for each diode so we need to pick one and see. Let's use the 1N4448. It is not the best choice but has the most detailed datasheet. We will use a reputable version from Vishey. The rated power dissipation is 440mW @ 45C which is the maximum amount of heat the diode can eject continuously in normal circumstances. We only care about power that is converted to heat which comes from some kind of internal resistance. The resistance comes in the form of a voltage drop across the diode. You often hear that silicon diodes have a 0.6V drop and Schottky diodes are somewhere around 0.35V but that number changes with current and temperature. Page 2 Figure 2 of the 1N4448 datasheet is a forward current vs forward voltage graph. Forward voltage is the voltage drop at a given forward current. We can approximate 17.4mA with the 1st line above 10mA. We find the forward voltage drop to be about 0.8V. Now 0.8V at 17.4mA is 14mW which is the worst case power dissipation from CR3.
Doing the same for CR4 we will use the same cathode connection of -15V through a 1150 ohm resistor. For the anode side we follow R72 (1k) through W2 (assuming jumpered in the test position which is a valid?non-fault condition) past TP10 through the collector-emitter junction of Q9 to +15V. If Q1 FET were to fail we could also see a direct short to +15V. So max operational current is 30V (+15 to -15) through 1150 ohms (fault) or 2150 ohms (non-fault) for 26/14mA. The forward voltage drop of 1N4448 at 26mA is maybe 0.85V. 0.85V at 26mA = 22mW power dissipation.
Modern silicon diodes exceed the specs of many of these old Schotkky diodes when they were used mainly for their low forward voltage to achieve a lower power dissipation. I hope that helps.
Another detail:
In my 3325B under repair, both CR3 and CR4 are 1901-0539, not 1901-0518. In alle other places in this unit, there are 1901-0518.
In my other, working, 3325B, all are 0158, inclunding CR3 and CR4. This unit is slightly older. so I think they changed CR3 and 4 to 0539 for a reason.
1901-0539 is listed in the MSN database as 5961-00-577-0558, which references also to 5082-2810
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HP 8350B plug-in external ALC help
Hi,
I want to experiment with external
leveling if my 83595A plugin using an external ALC source. I plan to use my 432A power meter which I know is compatible.
The manuals seem to be rather ?thin on details about how to set this up (the 8350B local operating guide refers to it, and explains in detail how to configure just about every instrument except the 432A!) - and so I¡¯m wondering if anybody knows of a good reference/tutorial that I can read?
I¡¯m assuming I need to sample the RF output with ?a coupler, detect it, and then feed it back.?
But some instructions to prevent me from blowing something up by accident would be reassuring!
thanks
tony
|
Re: HP 3325B repair, help needed with Schottky diode
Another detail:
In my 3325B under repair, both CR3 and CR4 are 1901-0539, not 1901-0518. In alle other places in this unit, there are 1901-0518.
In my other, working, 3325B, all are 0158, inclunding CR3 and CR4. This unit is slightly older. so I think they changed CR3 and 4 to 0539 for a reason.
1901-0539 is listed in the MSN database as 5961-00-577-0558, which references also to 5082-2810
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Jared Cabot
Augusto