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- HP-Agilent-Keysight-Equipment
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Re: Keypad for 70820A module
开云体育Hi Dave ? Welcome aboard to the HP 70000? users? ??there is a 70000 user group Firstly you will require 2 adapters as the input connectors are 2.4 and are not comparable with Possibly your standard connectors ( noting? SMA / 3.4 / 2.9 MM connectors are all interchangeable ) ? I also have a 70820? and I am currently looking for a mating RF signal generator to work with it A list of the mating sig generators are in one of the menus on the 70820 ? Best of luck Paul From:
[email protected]
[mailto:[email protected]]
On Behalf Of Dave Miller ? If anyone has a keypad that goes with a HP 70820A module I am
interested in obtaining one. ?Picked up a 70004A mainframe with a 70820A
module but the keypad is for another module. ? No virus found in this message. |
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Keypad for 70820A module
If anyone has a keypad that goes with a HP 70820A module I am interested in obtaining one. ?Picked up a 70004A mainframe with a 70820A module but the keypad is for another module. ?
Mute good news as the module passes self test. ?Now I just have to figure out how to use the microwave transition analyzer does but it look interesting. ? Thanks? Dave VE7HR? |
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Re: hp3586a selective voltmeter jammed
Yes. It was frozen just the same. The unit was in storage for some time and when I tried to use it the display was frozen. On the microprocessor board there is a battery for RAM back-up. When the battery failed, I guess the processor did not know what values to use at boot-up.
I also have a Yamaha HS-8 digital organ which also had a frozen display at power-on. It was a bad battery backed-up RAM chip which failed. I replaced the RAM chip and the organ was OK. You might wish to check any battery back-up circuit and battery backed-up RAM on the processor board. On 2019-Apr-15 5:33 PM, cc@... wrote: Hi Merchison, thank?you for sharing your experience. Unfortunately the HP3586A does not have a front-panel battery but a NiCd one on the power supply board for which I had to clean in the vinegar the same power supply board and the micro controller board to remove the residues of the leakage. My understanding is that the presence of that battery is not strictly necessary for the normal operation of the hp3586 and indeed, after cleaning, I also removed it temporarily. Just a curiosity: was it perfectly the same frozen display? --- This email has been checked for viruses by AVG. |
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Re: 8753ES LCD update
I took them and they will be forthcoming!
toggle quoted message
Show quoted text
On 4/15/2019 10:20 PM, W2HX wrote:
what?! no before and after pictures?! |
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Re: 8753ES LCD update
I'll do before and after pix on mine? On Mon, Apr 15, 2019, 7:22 PM W2HX <w2hx@...> wrote: what?! no before and after pictures?! |
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Re: 8753ES LCD update
what?! no before and after pictures?!
________________________________________ From: [email protected] <[email protected]> on behalf of Peter Gottlieb <hpnpilot@...> Sent: Monday, April 15, 2019 9:46 PM To: [email protected] Subject: [HP-Agilent-Keysight-equipment] 8753ES LCD update After I got my 8753ES working I was a little disappointed in the LCD brightness, especially right when you turn it on. I also didn't think the viewing angle was great; a little off to the side and it really dropped off. The main problem seemed to be that the CCFL backlight was old and needed replacement. The panel is a Sharp LQ084V1DG22 but unfortunately I couldn't find an online source for a replacement bulb, which is a special L shaped one to light two sides of the display. I did find a LED retrofit on ebay: But yikes, $93 plus $11 shipping? That's $104, for a backlight? That just seemed wrong to me. So I did some further research and found that while the LQ084V1DG22 is no longer manufactured, there is a somewhat compatible new version made, a LQ084V1DG43. The actual display has the same dimensions and mounting alignment features and is not as thick. It has a LED backlight and improved viewing angle! And it is $100 shipped! That's $4 cheaper than the replacement backlight! Here it is: So I ordered it and also went online to get the data sheet. There is one incompatibility from the original: the LED backlight takes 12 volts and uses this really tiny JST connector. Well, the backlight inverter in the instrument runs on 5 volts and there isn't 12 volts available. First problem was that JST connector. They are really inexpensive but good luck getting them. Digikey had the shells but no crimp pins. Mouser had neither in stock. Some other places had them but large minimum orders. I went to the JST site and found a page where you could order samples! Sure enough they arrives several days later. When I said tiny I meant it; these things require assembly under a microscope. 28 AWG wire is almost too big, certainly too big to crimp the terminal around the insulation and still have it go in the housing. I cut off those crimp ears and just crimped around the bare wire then soldered. Count on using the smallest tip and the solder which you use for doing rework on 25 mil pitch surface mount boards. It took me several to get it right. There are brightness and enable inputs for the backlight. Both default to on and full brightness if not connected so you only need 12 volts. I tested and yes it lights up. I then plugged it into the instrument (without installing mechanically) and it worked! I then took the old display out. It has some thick black gasket around the active area which was too crumbly to reuse. As the new LCD is thinner, and held to the front panel by a piece of sheetmetal, I had to use foam rubber tape to make up the extra thickness and keep the new LCD from moving around. I am not sure I like that I can see the unpainted frame of the new LCD so I may try and neatly put black tape around it where it's visible, mainly on the top. For now I just used a bench supply to do the final test of how it looks. I will deal with the 12 volts tomorrow, probably a new 7812 off of the raw +18 or something (it needs about 250 mA). Wow! The brightness is dramatically different! It's fantastic now, and the viewing angle is tremendously improved. If you're up for dealing with the tiny connector and the 12 volts this new LCD makes a dramatic difference. Additionally, the LED backlight had a long enough life that I will never have to worry about it again. Peter |
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Re: 8753ES LCD update
On 4/15/19 8:46 PM, Peter Gottlieb wrote:
Both default to on and full brightness if not connected so you only need 12 volts.Yeah, I found this with a TV LED back light recently. It's a nice feature. Allows them to be redeployed as light panels for photography, or as 92%+ efficient room lights if you can fit them in a fixture that passes muster with today's design standards. |
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Re: 8753ES LCD update
Ordered! Thanks! On Mon, Apr 15, 2019, 6:46 PM Peter Gottlieb <hpnpilot@...> wrote: After I got my 8753ES working I was a little disappointed in the LCD brightness, |
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8753ES LCD update
After I got my 8753ES working I was a little disappointed in the LCD brightness, especially right when you turn it on.? I also didn't think the viewing angle was great; a little off to the side and it really dropped off.? The main problem seemed to be that the CCFL backlight was old and needed replacement.? The panel is a Sharp LQ084V1DG22 but unfortunately I couldn't find an online source for a replacement bulb, which is a special L shaped one to light two sides of the display.? I did find a LED retrofit on ebay:
But yikes, $93 plus $11 shipping?? That's $104, for a backlight? That just seemed wrong to me.? So I did some further research and found that while the LQ084V1DG22 is no longer manufactured, there is a somewhat compatible new version made, a LQ084V1DG43.? The actual display has the same dimensions and mounting alignment features and is not as thick.? It has a LED backlight and improved viewing angle!? And it is $100 shipped!? That's $4 cheaper than the replacement backlight!? Here it is: So I ordered it and also went online to get the data sheet.? There is one incompatibility from the original:? the LED backlight takes 12 volts and uses this really tiny JST connector.? Well, the backlight inverter in the instrument runs on 5 volts and there isn't 12 volts available. First problem was that JST connector.? They are really inexpensive but good luck getting them.? Digikey had the shells but no crimp pins.? Mouser had neither in stock.? Some other places had them but large minimum orders.? I went to the JST site and found a page where you could order samples!? Sure enough they arrives several days later. When I said tiny I meant it; these things require assembly under a microscope.? 28 AWG wire is almost too big, certainly too big to crimp the terminal around the insulation and still have it go in the housing.? I cut off those crimp ears and just crimped around the bare wire then soldered.? Count on using the smallest tip and the solder which you use for doing rework on 25 mil pitch surface mount boards.? It took me several to get it right. There are brightness and enable inputs for the backlight.? Both default to on and full brightness if not connected so you only need 12 volts. I tested and yes it lights up.? I then plugged it into the instrument (without installing mechanically) and it worked! I then took the old display out.? It has some thick black gasket around the active area which was too crumbly to reuse.? As the new LCD is thinner, and held to the front panel by a piece of sheetmetal, I had to use foam rubber tape to make up the extra thickness and keep the new LCD from moving around.? I am not sure I like that I can see the unpainted frame of the new LCD so I may try and neatly put black tape around it where it's visible, mainly on the top. For now I just used a bench supply to do the final test of how it looks.? I will deal with the 12 volts tomorrow, probably a new 7812 off of the raw +18 or something (it needs about 250 mA). Wow!? The brightness is dramatically different!? It's fantastic now, and the viewing angle is tremendously improved.? If you're up for dealing with the tiny connector and the 12 volts this new LCD makes a dramatic difference.? Additionally, the LED backlight had a long enough life that I will never have to worry about it again. Peter |
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Re: hp3586a selective voltmeter jammed
...forgot to write that I checked again the voltages and their ripples and everything is good. I am trying around cables and connectors and inspecting the solder joint for the two connectors which bring bus cables to the A98 front-panel board.?
I am scared that the fault could be on the microcontroller board A60 because it will be really hard to find. I still hope in something about connectors, cables and A98 display-panel. Finally I found a good not-blurred schematics here? Thank you Ciro |
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Re: hp3586a selective voltmeter jammed
Hi?Merchison, thank?you for sharing your experience. Unfortunately the HP3586A does not have a front-panel battery but a NiCd one on the power supply board for which I had to clean in the vinegar the same power supply board and the micro controller board to remove the residues of the leakage. My understanding is that the presence of that battery is not strictly necessary for the normal operation of the hp3586 and indeed, after cleaning, I also removed it temporarily. Just a curiosity: was it perfectly the same frozen display?
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Show quoted text
On Mon, Apr 15, 2019 at 06:00 PM, Merchison Burke wrote: HP8165A |
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Re: Type of coax for Impedance Analyzer Test Fixtures
Thanks Ed, Brooke, and Don; One of the problems I am faced with is that I am trying to adapt newer fixtures to an older 4192A Impedance Analyzer and the Open/Short Zero is for spot frequencies only. Additionally my dielectric fixture is home-made and will not have the precision of the HP unit. It should be good to a few percent which I will be happy with. The top electrode will have a guard and mount under the phenolic plate. Springs push this plate against the micrometer which is used to set the gap. The lower electrode will be held down by the spring in the photo, and pushed up by the three pointed nylon spacers set in dimples. The spacers can be adjusted to set the tilt of the lower electrode to match the top electrode, and to set the zero gap. The concept is simple but the implementation is not.? The sliders and rods are from an old dot matrix printer.? On Mon, Apr 15, 2019 at 3:59 PM Don Bitters via Groups.Io <donbitters=[email protected]> wrote:
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Re: Type of coax for Impedance Analyzer Test Fixtures
开云体育The calibration of the 4285A calls for the 42100A precision resistor set, the 16380A, 16380C precision capacitor standards - cal’d to 30MHz or more, possibly the 16074A resistor set, inductor standards, and multiple fixtures. ?There are 20 service guides, operating manuals, service manuals, user guides, and software revisions available on the Keysight 4285A web page available for download. ?There is also an excellent primer on LCR, impedance measurements.Don Bitters |
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Re: E4401B No 50MHZ Cal signal
开云体育Thanks for the info, John! ? ? From: <[email protected]> on behalf of "jrann1 via Groups.Io" <jrann1@...> ? Mike... |
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Re: Type of coax for Impedance Analyzer Test Fixtures
Having worked on the HP YHP product line for many years, the cable types were never identified in the manuals, but back then you could ask the service engineers that question. I never needed to ask.
Another possibility is to check the service manual parts list, find the vendor for the cable, then check their product line. What I would expect to find is that the cables are low impedance, low capacitance/ft (m). I would also guess them to be either 50MHz or 500MHz mini coax cables because that was readily available in the 1980’s. When YHP started making the higher frequency impedance analyzers - 4286’s and up - the fixtures changed to accommodate the higher frequencies. The switches for 1, 2 meter cable sets with fixtures were used to offset the cable compensations needed, the compensation range circuitry did not change, just the offset. Options were used to extend the ranges even further to 5 meters and more. Compare this to the 3468 four wire measurement, but measuring not only the R, but including L, C, and Z. I also remember using 50 ohm coax cable in the calibration of the HP 4192 Impedance Analyzer - 1GHz. Don Bitters |
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Re: E4401B No 50MHZ Cal signal
?Alex, Artek has the E4401 CLIP, which also covers the E4411B.? (Dave should really modify his search to let E4411 searches find that.) Keysight has a free pdf of the service guide for the E44xxB series.? Search Keysight Support for "E4411B".? The service guide part number is?E4401-90474 --John Gord On Mon, Apr 15, 2019 at 08:01 AM, Alex wrote: On Mon, Apr 15, 2019 at 07:43 AM, ArtekManuals wrote: |
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Re: Type of coax for Impedance Analyzer Test Fixtures
Hi Peter:
The Open/Short is to remove parasitic effects at the terminals of the test fixture. See the Impedance Handbook section "Compensation function" paragraph 2.4.6 in my version. This is different from cable length correction. Also see 3.3.2 User-fabricated test cables where the specifications are: 50+/-0.5 Ohms Capacitance 105 pF/m 300V rms Conductors: 4, 26 (7x34) AWG Polyethylene Jacket for 80c PVC Also be aware of proper 4-terminal pair wiring: and Guarding: -- Have Fun, Brooke Clarke axioms: 1. The extent to which you can fix or improve something will be limited by how well you understand how it works. 2. Everybody, with no exceptions, holds false beliefs. |
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Agilent E5062A Not Booting-Up
Dear Group - Agilent E5062A Network Analyser Powers-Up and Agilent Technologies Logo appears on Screen but will not continue to Measuring Screen.CMOS Battery has been replaced and Date/Time Reset and Restore Defaults but still No Joy !!? Any guidance appreciated....
?????????? Thanks Marc Christian |
Paul Bicknell
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