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Re: List of capacitors to rebuild HP 8920A power supply
I might add that all of the electrolytic capacitors in my 1992-1993 era HP 8920A power supply were leaking nasty smelling electrolyte.?
If you haven't done so, I'd suggest re-capping your power supply before the leaking electrolyte destroys the circuit board.? I caught mine in just a nick of time.?? The Nichicon capacitors in the list that I provided are all of very high quality and are rated at105C.? They should provide many years of service.? With the exception of the 47 uF capacitors, they will all fit into the circuit board perfectly and will be roughly the same size as the original Rubycon capacitors. Brian |
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Re: List of capacitors to rebuild HP 8920A power supply
¿ªÔÆÌåÓýAnyone have a parts list for the 8935. ?I need to rebuild mine and it would save time if I can order them before I pull the supply. Thanks. KE6CD? On Jul 22, 2021, at 10:36 AM, Brian J. Henry <bhenry@...> wrote:
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List of capacitors to rebuild HP 8920A power supply
List of capacitors to rebuild HP 8920A power supply: ?? DIGI-KEY PART: 493-12239-1-ND QUANITY: 4 MFG: Nichicon (VA) / UPM1H471MHD1TO DESC: CAP ALUM 470UF 20% 50V RADIAL ? DIGI-KEY PART: 493-6910-ND QUANITY: 9 MFG: Nichicon / UHW1H102MHD DESC: CAP ALUM 1000UF 20% 50V RADIAL ? DIG-KEY PART: 493-11850-1-ND QUANITY: 4 MFG: Nichicon (VA) / UPV1H470MGD1TD DESC: CAP ALUM 47UF 20% 50V RADIAL ? DIGI-KEY PART: 493-7885-ND QUANITY: 1 MFG: Nichicon / LGR2G221MELB40 DESC: CAP ALUM 220UF 20% 400V SNAP ? DIGI-KEY PART: 493-7889-ND QUANITY: 1 MFG: Nichicon / LGR2G101MELA30 DESC: CAP ALUM 100UF 20% 400V SNAP ? DIGI-KEY PART: 399-PME261EB5470KR30-ND QUANITY: 3 MFG: KEMET / PME261EB5470KR30 DESC: CAP FILM 0.047UF 10% 630VDC RAD ? DIGI-KEY PART: 399-5410-ND QUANITY: 1 MFG: KEMET / PME271Y422MR30 DESC: CAP FILM 2200PF 20% 1KVDC RADIAL |
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Loading RFTOOLS files into an 8920A
I just acquired a relatively early HP 8920A? (s/n 3291U00211) that had a defective power supply.? Once all of the electrolytic capacitors were replaced, it started up and passed all of its self tests!
Now, I am trying to figure out how to successfully load the RFTOOLS Procedures from the files posted here using an HP 9122C disk drive.? I have had some success, but have run into a road block and I don't know how to proceed. It would seem that the RFTOOLS Procedures that are posted in the Files section came from an HP 8920B since they use DOS file naming conventions.? Apparently, the HP 8920A expects the Procedure files to use LIF file naming conventions based on this information from the Programming Guide: The Test Set¡¯s TESTS Subsystem uses the following file naming conventions:
? The c prefix is used to indicate a code file and is automatically prefixed onto the file
name when the program code file is stored for use by the TESTS subsystem.
? The p prefix is used to indicate a procedure file and is prefixed onto the file name when
the file is stored by the TESTS Subsystem
? The l prefix is used to indicate a library file and is prefixed onto the file name when the
file is created by the Program Development System for use with the TESTS Subsystem. Armed with this information, I renamed the RFTOOLS files from: RFTOOLS.LIB? ==> lRFTOOOLS RFTOOLS.PGM ==> cRFTOOLS RFTOOLS.PRC ==> pRFTOOLS Once I made these changes, the RFTOOLS "Procedure File Name:" appears in the Load Test Procedures menu, but the Library does not. When I try to run the Procedure and I get the following error message: "Error reading procedure file.? Check file and media." I have tried loading them into the HP 8920A using both a LIF formatted disk and a DOS formatted disk and I get the same result with both.? I get the same result with all of the other RF Tools program files as well. I am wondering if the HP 11807A files for the HP 8920A are configured or coded differently from the HP 11807E files for the HP 8920B? Does anyone have any thoughts as to what might be the secret to getting the RFTOOLS files properly loaded into the HP 8920A using an HP 9122C disk drive? Thanks! Brian |
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VOLTMETER SELF CALIBRATION FAILED (HP 8920B)
hello to all the group
i have this problem with hp8920b , VOLTMETER SELF CALIBRATION FAILED. ERROR = 223, 0X000035f5. can anyone tell me which board to look at that causes this anomaly?? ?on the manuals is not mentioned anywhere this type of failure 0x000035f5 photo attached thanks to those who can help me. |
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Re: DIY SRAM cards for Epson and regular PCMCIA styles
Hi Hank, A lot depends on where one's skill set lies, but it seems to me that just one set of hardware and code on a microcontroller (or Arduino etc) is less work than controller and PC hardware and software. It was just a suggestion. |
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Re: DIY SRAM cards for Epson and regular PCMCIA styles
To begin with a controller would be more expensive and much more complicated.? There has been little success doing DIY GPIB translation, and even some commercial units only partially implement GPIB functionality.
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?$149.95 ? ? ? ? ? ? ? ? ? ? ? ?some user comments: ? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ? ? ?Not for Agilent/Keysight ? ? ? ? ? ? ? ? ? ? ? This interface does work but if your intention is to use it with Agilent/Keysight equipment
? ? ? ? ? ? ? ? ? ? ? and software then get something else as this will not work. ?
? ? ? ? ? ? ? ? ? ? ? Works as expected
? ? ? ? ? ? ??? ? ? ? ? ? ? ? ? ? ? Nothing much to say, it just works on my HP8563E Spectrum Analyzer, allowing ? ? ? ? ? ? ? ? ? ? ? me to control it via PySerial, no problems so far. The cards are electronically simple, cheap, and easy to use and move around. Hank |
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Re: DIY SRAM cards for Epson and regular PCMCIA styles
Ran across some r/d regarding the failures of the Epson type card and other work by U Conn.
including schematic of a novram solution that was tested. What was wanted was the speed of ram, but the problem of battery.? I don't know what patent problem there is, but something new might get around our problems. A bit off topic, but what precipitated the study... I just happen to have a couple of 32K 85700A cards and wanted to make them more useful, not send a man to mars. I have no HPIB hardware, but I see the need.? SD cards also have so many writes and cost goes up for the "Industrial strength" long-life and critical models, but they DO work.? My old 486 Toshiba laptop Hard drive went out and there wasnt a 300mb EIDE replacement available in the same form factor, so I got one of those? EIDE-SD adapters and dual-boot FAT16 formatted one for DOS 6.22 and Win95a.? It isn't in daily use, but so far-so good.? A lot easier to swap drives since there is no USB and the Floppy died. |
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Re: DIY SRAM cards for Epson and regular PCMCIA styles
If we want a common design, would a controller and SD card slot in a HPIB connector that simulated a HPIB HDD e.g. 9134D, not be a better solution? This could be common for many other instruments. With the possible exception of Firmware updates, and most machines that have flash firmware have PCMCA, it does not matter if you are writing to a front panel card or a external "disk"
Robert G8RPI |
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Re: 8924C power in on 60watt port question.
The quick setup document in the files section will get you started, but the 8920A-B-Application-Handbook-08920-90126.pdf
is more devoted to AM/FM/SSB tests, It also shows the block diagrams which helps to understand the setups.? These tests are mostly the same for the 8924.? Get to know it.? The 8924 manuals go more into cell testing. The 60 watt N connector port goes to a very small internal 30db power pad to the antenna port. For the bench, I generally use an external 300w 30 or 40 db pad rather than heat up the instrument. Also a good idea to use external 10-20 db attenuation for any antenna hooked up to the antenna port. I have often noted that first thing a newbie will do is hook up an antenna to the antenna port at a site and immediately fry the input.? Anyone who has been around will have PTSD about it. |
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Re: 8924C power in on 60watt port question.
Ok Thank Ralph I though it would be OK as long as I stay on then 60 watt port but I wanted to make sure before I did something stupid.? Jim sorry I meant to say output to the 60 watt port. Thanks for the info in the oscilloscope being a audio only I did read where that the 8920 is like a 17khz scope so guess the 8924 is the same. I have put an antenna on the other input port and used it like a radio and it worked very well, I would never put any RF on that I put.? Anyway thanks Guys for taking the time to straighten me out, |
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Re: 8924C power in on 60watt port question.
¿ªÔÆÌåÓý
Spectrum analyzer is used on the? RF I/O port, or over the air spectrum analyzer in the antenna port, DO NOT connect transmitter to the ANTENNA PORT! When you say "output" what do you mean? The built in scope is for
AUDIO/DC. NOT transmitter RF. On 6/19/2021 04:17 PM, William
Verstelle wrote:
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Re: 8924C power in on 60watt port question.
I have a 60 watt 8294 and have no problem putting a transmitter into the 60 watt port and using any function of the 8294.? It will take 100 watts for a very short time but I would not go over the 60 watt rating. You may want to set the SA level to the 50 db or what ever is the highest setting to start with before transmitting. Ralph ku4pt
On Saturday, June 19, 2021, 05:17:27 PM EDT, William Verstelle <bverstelle@...> wrote:
Hi group, first forgive my ignorances but on my hp8924c I have been using it to align my transceivers, in transmit mode on the 60 watt port I can look at power, frequency etc, but I want to also look at the spectrum and output on the build in O scope. Can I safely do this via the 60 watt port without damaging anything? If so is there anything I need to do when I go to SA or Oscope mode?? Thanks, _._,_._,_
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Re: DIY SRAM cards for Epson and regular PCMCIA styles
This project notice was sent out as a special message.? That just means that our members that read postings using the Groups.io web?interface will receive this announcement in their email.
Sometimes web users may not check for postings very often. |
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DIY SRAM cards for Epson and regular PCMCIA styles
I'd like to get an idea of interest in building a DIY card for our HP RF test sets.? Mine takes a regular PCMCIA card, but it might work out that a PCB design for the Epson will be available first.
If you email me directly I can report back to the entire group what the response is (mention if Epson or PCMCIA).? If you have general comments to make please post here as usual. This will free us from paying the high bucks for the cards, and it might also lead to a companion device that will provide for reading cards free from the tyranny of having to get old PCs with PCMCIA slots and the problems with the attendant, often flakey software.? This reader would use a USB connection (or plain RS-232). Hank |
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Re: Epson card upgrade?
Reading some comments on the net regarding homemade HP48 cards, it seems that tinned fingers are degraded by being in direct?contact with gold sockets.
Tin and lead are far from gold in the galvanic series.? In fact, because gold is at one end of that series, gold bothers everything except more gold.? I would expect that simply not leaving a DIY tin plated card inserted in the HP for long periods will prevent any significant deterioration.? The PCB houses do, though, provide for gold plating; it's just a bit more expensive, but probably a good idea once a design is finalized. I appreciate that jb is on track to upgrade the capacity of his card rather than make a new complete DIY card, but there will still be strong synergy between doing an upgrade and doing a DIY card. ?jb: Others have complained that tin plate goes flaky.? |
jim