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- HP-Agilent-Keysight-Equipment
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Re: wanted clip for E4432B output board E4400-60188
开云体育Hi Peter,
I don't have a CLIP for that board, but where is the problem in the circuit? The block diagram for the E4400-60188 might help. See:
Tom
On 7/13/2024 3:53 AM, Peter Hansen
wrote:
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Re: VNA calibration kit to 50 GHz
Hello Neil,
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I followed this subject because I am also interested exactly the same scenario like yours. I have had some reading about waveguide and calibration of the 8510C and I can say that there are no 50ohms waveguide terminations. Waveguides have a "wave impedance" which can fluctuate a lot. For rectangular waveguides as a rule of thumb you can say they have 500 ohms from what I was reading in some articles but there are some excel sheets with formulas that can calculate the wave impedance for your waveguide more precisely. From what I saw the waveguide calibration kits have the following parts: - waveguide load (termination) - short (I saw flush ones, 1/8 wavelength ones, 3/8 wavelength ones (you need to look on a Smith chart to see how they show up)) - shim - standard section (used for system verification only) - straight section (used as port 1 and 2) Waveguide load you can find on eBay. Look for the ones that have a label on them and buy the ones that have the lowest VSWR. I saw a Narda one for example with 1.035. You can get a sliding load which I understood it is better but I need to read more to understand why and how it is used during calibration procedure... If you know someone with a milling machine maybe he can make the "short" one for you and also different sizes. Standard section and straight section you can also find on eBay. Some are cheap some are not cheap. Try to buy the well known brands and not the "no name" ones. Regards, Razvan On 13/07/2024 12:44, neil via groups.io wrote:
Just for starters with no calibration kit i'm just wondering how far i |
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Re: VNA calibration kit to 50 GHz
Just for starters with no calibration kit i'm just wondering how far i can get if i operate in waveguide. So at the end of the two coaxial cables connected to the 8510C there are transmissions to fundamental waveguide. I can then connect my DUT between the fundamental waveguide flanges. So in making a SOLT calibration, for Short i just measure S11 and S22 when there are conducting metal plates over the ends of the waveguide transision exits, for Open i just leave the ends of the waveguides open, making sure they point in the direction of empty space so there are no reflections from object outside the waveguide exits, for Load i just connect 50 Ohm waveguide terminations to the waveguide exits, and for Thru i just connect the ends of the waveguides together. I know this is rather crude, but might this work as a first shot at making a full 2-port calibration?
I know the 8510C is limited in storage, but in principle using the HPIB all configurations can be storing in a driving PC, even perhaps making the calibration corrections in the PC, if you write the DUT uncalibrated data and the calibration data to the PC? many thanks, Neil |
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wanted clip for E4432B output board E4400-60188
开云体育
Hello Can anyone help me with that. I have a Fet fault where bias circuit is not working correct either. I must the version that uses the H1 Fet (SHF-189)
Best regards Peter OZ1LPR
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Re: HP 8566B - Can my high voltage transformer be faulty?
I have replaced several in the 85662A many, many years ago. There are 2 types depending whether you have a long CRT (PN 5083-5791, IIRC), or a shorter CRT newer type dot raster scan CRT (Panasonic). The HV transformer is inside the metal box at the rear, left of the CRT (A1A6 circuit). They usually fail open. You should see a shrunk image on the CRT when the HV transformer fails, both horizontally and vertically, or a dim dot. You will still have a good display if you check the video and horizontal outputs on an oscilloscope.
Don Bitters |
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Re: HP free e-book
Gianni, this is a work of art.? Very nicely done!
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Peter On 7/12/2024 5:23 PM, Gianni Becattini via groups.io wrote:
A new edition of the e-book "The Great HP" has been released and can be freely downloaded from my page www.k100.biz <>. I removed the Advantest R3132 (now in a separate ebook) and added various instruments. It has now more than 1,000 pages. |
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Re: Made one out of workshop scrap to enable the correct tightening of SMA 's
On July 12, 2024 9:35:13 PM "Steve Hendrix" <SteveHx@...> wrote:
You're a mean, bad man Steve. ;)That is what happens when you try to use the incorrect word for a spanner....or was that spammer? <couldn't resist> -Dave -- Dave McGuire, AK4HZ New Kensington, PA |
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Re: Bubble Memory Reseed
Thanks for the responses. I did see the Hackaday project to build a Bubble Seed Module, but it was for a SBC-85 board. Evidently, HP built or had built their own module. Volume I of the service manual shows a (grainy on my copy) photo of the device. You plug it in and run Test Routine 169.
Ed, the Boot Loop routine you referred to can be run with loading a program from the manual with a HP-1B controller. Maybe, that is all I need. The program would have to be hand typed in, and I'd have to find a way to emulate the controller. I have a Prologix USP Controller. I'll have to figure out how to use it. The history of Bubble Memory is interesting. Turned out to be a blind alley, but it was a creative idea. Thanks again, John |
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Re: Made one out of workshop scrap to enable the correct tightening of SMA 's
That is what happens when you try to use the incorrect word for a spanner. G Edmonds On Friday 12 July 2024 at 22:06:05 BST, Tom Lee <tomlee@...> wrote: She must've been very strong... (sorry, couldn't resist) On 7/12/2024 10:10 AM, george edmonds via groups.io wrote: > Hi John > > Used a wench of Chinese origin |
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HP free e-book
A new edition of the e-book "The Great HP" has been released and can be freely downloaded from my page . I removed the Advantest R3132 (now in a separate ebook) and added various instruments. It has now more than 1,000 pages.
To make easier the download, I split the file in three parts which can be downloaded separately. Tell me if you have problems - any suggestion welcome. |
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Re: Made one out of workshop scrap to enable the correct tightening of SMA 's
soda -> keyboard
On July 12, 2024 5:06:11 PM "Tom Lee" <tomlee@...> wrote: She must've been very strong... -- Dave McGuire, AK4HZ New Kensington, PA |
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Re: Made one out of workshop scrap to enable the correct tightening of SMA 's
She must've been very strong...
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(sorry, couldn't resist) On 7/12/2024 10:10 AM, george edmonds via groups.io wrote:
Hi John |
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Re: VNA calibration kit to 50 GHz
I have an old 85056A that I bought 15 years ago from a company that has never used it since the first day they bought it new from HP. With it I also bought their 8510B 40 GHz that I converted into an 8510C. 20 years ago I had bought an 8510C 26.5 GHz with its 85052B still coming from an other company that was looking to modernize with a PNA.
Up to 26.5 GHz it's possible to do a fairly simple calibration with fixed loads and open and short circuits. But if you want to be precise, it's better to do a full calibration with the same elements plus sliding loads. Then I stocked up on the elements needed for TRL calibrations, but I've never had the courage to use them yet, as they're relatively more complicated. I also had an 85053A individually calibrated for over $3000 less than 10 years ago at Keysight Roseville (the only place where they know how to do it according to Keysight), so I was able to check several times the difference between with and without sliding loads. On the other hand, I was able to verify that for 40 GHz, it's really mandatory to use sliding loads because fixed loads aren't good enough to really know what we're doing. That's why I have also one (unfortunately) 2.4mm air line. I think we should bear in mind that up to 50 GHz this is even truer, and that without sliding loads, without air lines, and without an individually calibrated verification kit (which is almost never the case) to check the result of what we're doing, we can only be in the fog. For some years now, as I've run out of space, I've stored the two 8510Cs at my country house, and all I have at home is a small (but fantastic) 8720ES. The 8510C is a slow, impractical instrument, with no computing power, no possibility of storing tons of configurations in internal memory, and no ability to interpolate if the frequency limits are changed. However 8510C is still a very accurate instrument that I was able to compare to several from R&S and HPAK... It's only PNA-X that was better in term of stability along time. For better verification of all calibration parameters, option 010 is practically mandatory. Fortunately, I have it on all three of my VNAs. F1EKU. |
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Re: HP1743A scope
I have a todo list of things already very full but I begin to realize that indeed, as you said, it is worth the effort.
Of course all your tips are invaluable Raymond. As I said I got with the scope, in the pouch, the "Operating and service manual" in an as-new condition. This is maybe silly but it's nearly as much pleasure than the scope itself! Aren't we all nuts? Thanks, Renaud |
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Re: Made one out of workshop scrap to enable the correct tightening of SMA 's
We torque our stainless steel SMAs to 8 in-lbs, not 10.
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Regarding 5/16 inch wrenches with the slot to slip over coax, Mini-Circuits part number HT-4-SMA is about $37.? Nice knurled handle for good grip, too.? Found one in the lab this morning.? ? HTH.? ? Jim Ford?
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Re: How to remove the output cable of the isolator in the 8672A
开云体育Flare wrench set available from Harbor Freight for <$20. 5/16 should work for SMA. Just a thought. On Jul 12, 2024, at 11:41?AM, Erik Kaashoek <erik@...> wrote:
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Re: Made one out of workshop scrap to enable the correct tightening of SMA 's
Hi John Used a wench of Chinese origin, was very lightly case hardened so was possible to drill with a normal HSS drill bit in a battery drill. Would never attempt to do so with one of US manufacture. I repair a lot of kit that use SMA and SMC connectors and being a nerd I like to torque the connectors up correctly which in the case of SMA is 5 in-lbs for brass ones and 10 in-lbs for stainless steel ones.. G Edmonds On Friday 12 July 2024 at 16:04:49 BST, John Griessen via groups.io <john@...> wrote: On 7/12/24 07:13, george edmonds via groups.io wrote: > Made one out of workshop scrap Good going! Did you drill that wrench handle as-is, or after heating and annealing so it drilled more easily?? Or is it not a drill hole I see there? |
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Re: VNA calibration kit to 50 GHz
I don't think you want to do SOLT calibration at 50GHz with elements that you do not really know a whole lot about.
Get yourself a decent Thru element, an arbitrary (but good mechanical quality) reflect and a few decent 50 Ohms air lines. Then you can do a TRL cal and you do not have to rely on the quality of reference data. At low frequencies TRM is a good alternative if you have a good low frequency match element. I have experimented a lot with not very well known cal elements up to 27GHz and TRL was the only way to achieve a decent calibration, not to speak of 50GHz. Best regards, Tom |
Dave McGuire
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