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HP3456A GPIB problem 16
Working on writing a communications library to control my HP3456A DMMs. One of the meters that I have responds to instructions to read and write just fine. The other meter will read the correct value from the meter and responds to serial polls correctly, but will not accept commands like setting the mode or range. Looking at the GPIB bus with a logic analyzer, it accepts the address with sane looking handshaking, but the first byte of the command string never gets an NDAC response. The transaction then times out. The meter does not hang after this or stop updating the display and reading the keypad. The meters both pass the self test. I looked through the service manual and did not see any reference to the self test doing a checksum on the EPROMs. I am using the same code to talk to both meters. Initially, I was expecting a dead bus transceiver chip, but all of the handshaking signals operate correctly in other parts of the transactions. Now, I am thinking that it is either the GPIB controller chip (MC68488) or possibly an EPROM problem. Has anybody run into this or have any thoughts on this? Thanks, BobH
Started by BobH @ · Most recent @
Rebuilding the OS on an E5071B 3
Hi, This has been on the backburner for a few weeks since it got frustrating and figured this is the correct place to ask. Does anyone here remember how windows 2000 boot partitions work in enough to explain how to set whatever flags tell a computer to boot from it? Or have a good explanation for how to make a working install disk for it in this day and age? (I do, by virtue of the circumstances, have another windows 2000 computer with a floppy drive to utilize). Long story short, the radio club at MIT has a dead E5071B, and a working one with the same motherboard revision and hardware. The dead one had a flaky power button (which has been fixed) and also apparently a corrupted windows install (which the system recovery floppy was not able to fix). The initial symptoms of this were that it would get all the way up to the windows 2000 splash screen, and then instead of it showing the desktop briefly before booting the VNA application it just goes black with a cursor and becomes completely unresponsive. Fwiw I also have no particular reason to think this was because of a disk failure, albeit if there’s an easy way of adapting a new 3.5” drive to IDE I’d like to know about it. Anyway, of course having two of these I had the brilliant idea that I’d just image both drives, write the disk image from working unit to the bad one, and then sort out whatever files I inevitably needed to edit because they now had the wrong serial number. The result of this was the computer failing to find the OS at all and just displaying something to the effect of “no operating system found” after post. Given how much of a pain it always seems to be to make install images for modern windows, this is where I’ve left it. But I’d like to go back and fix the thing. To do that it seems like I’m in need of one of two things, that being either clear instructions about how to copy a windows drive from that era such that the new one will boot, or some advice as to the correct process to create a functional install disk for windows 2000 so I can just reinstall everything from scratch. Thanks, Daniel Sheen, KC1EPN
Started by Daniel Sheen @ · Most recent @
HP42851A EEPROM Read Error 3
Hello, I've managed to snag an HP42851A Precision Q Adapter and the required HP4285A Precision LCR Meter (with option 002) on eBay. Unfortunately, the HP42851A seems to have an EEPROM failure. With the 4285A powered on, I turn on the 42851A and see the following messages in succession: - Setup in Progress - E113: EEPROM Read Status Error - E116: Q Adapter control failuer Images: https://drive.google.com/drive/folders/1GZrZxvoJv2w_Ie9PuT_oGFSF0KEnquS7?usp=sharing I've never fixed an EEPROM failure before. Is anyone here familiar with this device's EEPROM contents?
Started by Nick Kirkby @ · Most recent @
HP853A+8559A spectrum analyzer. 9
Hey everyone, I recently picked up an 853A analyzer mainframe and two 8559A 10M-21Ghz modules. Of course, it's broken. They all power up just fine but all I can get on the screen is an horizontal line in the upper section of the screen. It's as straight as it can get. It does seem to respond to the settings as the beam varies. It's a complex instrument and I'm not familiar with it. Does anyone have an idea what's going on with it? I suppose it may be in the mainframe as two modules, although unknown, give the exact same results.
Started by AArnaud @ · Most recent @
4342A Q-Meter Lubrication 4
Hello All, I thought I'd share some pictures from my teardown of the HP4342A Q-Meter purchased from eBay. I wasn't planning on opening it up, however the knobs were impossible to turn so I had no choice. The frequency adjustment knob was easy to lubricate with WD-40 after removing the top and bottom panels. I then lubricated the C and Delta C knobs. This made them easy to turn, but the cable slipped on the grooved knob pulley, indicating that there was still something sticky within the machine. I initially thought the seized shaft was within the variable capacitor. Only after disassembling the capacitor did I narrow it down to the C and Delta C indicator wheels. These were impossible to lubricate in-place as there's no wiggle room to get the lubricant in. The bushings must have been lubricated with something which turned very sticky over the years. The bearings all rotated very smoothly. The C and Delta C indicator wheels were a pain to remove because of the anti-backlash cable and strip mechanisms. I took plenty of pictures while taking it apart so I had some hope of getting it back together. When rotating the indicator wheels with my hand, the shaft rotated in its housing, indicating a large amount of friction between the wheels and the shafts. Fortunately whatever lubricant was in there was just very viscous and there was no metal-on-metal galling. The result is that I was gradually able to get the shaft to move outwards by applying pressure to the inside end while rotating the indicator wheels relative to one another. After getting just a little bit of penetrating oil in there, everything spun freely. Images are here: https://drive.google.com/drive/folders/1uSIKWlFdGZwEMRr6NjHeV9HHlCJqCUHP?usp=sharing
Started by Nick Kirkby @ · Most recent @
HP Agilent 8753ES VNA repair [Help] 40
Hi everyone, I am looking for some help on the repair of my 8753 VNA. I took some time trying to find the problem it myself with the service manual without success. The unit was working great and failed during my last filter mesurement. The signal is now noisy on port 1 and 2 (in S11,S22 ans S21), even if I do a new calibration. I have no error on power on. Have you ever entered this type of failure ? I was first thinking of an ESD failure but it do not seems to be the case. The two input couplers mesure OK. I have 16 dB of coupling loss on port 1 and port 2. Visual inspection do not show any damage on the RF patch. The solid state switch also seems to be OK. I have 2 dB of loss between the input and the two output of the SP2T. In span zero mode I mesure a RF signal at the right frequency in the 1 MHz- 6 GHz band. Output power is also OK. The stepped attenuator seems to be Ok, signal source is there. The only problem I can see here is when I look at the RF out signal on a spectrum analyser, the RF signal do not seems to be locked. When I reduce the SPAN on the VNA, I can see a lot of spike on the response. From what I understand, I now need to check the A7 Pulse generator diode stage and the A11 Phase lock board. The red LED on the A11 board is blinking but do not stay ON. Could you help me from this point on this repair ? Thank you ? S11 signal, port 1 open SPAN 6 GHz: S11 signal, port 1 50 Ohms load, SPAN 6 GHz: S11 signal OPEN SPAN 1 MHz S11 Signal SPAN 6GHz with 50 ohms load
Started by MattSNE @ · Most recent @
E5071B ENA Suddenly Fails Self Tests 4
Hi All, Have this ENA at work that suddenly "died". Fails internal tests "A3 DC" and "Rch Power Gain". Tried 2 of the External Tests ("Tch Power Gain" and "IF Ranging") both of which failed as well. The Service Manual for these units is not much help... says it could be a variety of assembles, all of which are not cheap. Keysight wants BIG BUCKS to repair this... boss says forget about it. They will get a new one, perhaps from Signalhound. I can put a SA on the ports and in CW mode see a nice tone at the correct amplitude. So maybe the receiver is bad? Any ideas on what to check would be most appreciated! Mark
Started by Mark Bielman @ · Most recent @
Tool to remove "fancy" BNC nut (0590-1251) 12
Does anyone have a tip to remove the BNC nut described in the manual as a "fancy" BNC nut? HP part (0590-1251) This is on the front panel of the HP5334B counter and I want to be careful not to mar the surface. None of the sockets I have seen to fit. I thought a 9/16" would work but it doesn't.
Started by vk2bea @ · Most recent @
HPIB cables 2
Hi all, Sphere Electronics has yet more HPIB cables going cheap. https://www.sphere.bc.ca/recently-added/ Regards, Waz
Started by Warren @ · Most recent @
Original HP 606A sig gen manual 2
A basement cleanup unearthed an original Operating and Service Manual for the 606A. It has the yellow Change Sheet for Errata and Change 1 and 2. Perfect condition, not dog-eared or marked on - pretty surprising considering it carries a print date of October 1961. Available for the cost of mailing to the first person who wants it and can prove they still run one of these beasts. Thanks... geo
Started by n4ua @ · Most recent @
HP8754A VNA Resurrection 3
Gentlemen, About 25 years ago, I acquired an ancient HP8754A VNA plus S parameter test set cheap due to a fault which I subsequently fixed. It's been in mothballs since then, but I pulled it out the other day to see if it was still working (spoiler - it's not!) With the polar display activated, I can get a dot on the center line at the far right with an 'open' standard plugged into the test set's port 1. I can also get a dot on the center line at the far *left* with a 'short' standard attached to port 1. However, a 50 ohm load displays as a short arc just above where the 'short' position appears when there's a short attached instead of bang smack in the middle of the display where it should be. I tried several 50 ohm loads and they all displayed in this same way on this analyzer. However, there was one exception - a high quality load labeled as 50 ohms which displayed as a short arc just above where the 'open' standard trace appears! Like flipping a mirror image of all the other 50 ohm loads and it happened every time! I checked the DC resistance of all the loads and they were all about 50 ohms give or take an ohm - except for the odd one out which measured 54 ohms (must have been damaged at some time I guess). Anyway, this is the one that gives the 'mirror image' result so it's like the analyzer is *way* over exaggerating differences in any attachments between the two extremes of a dead short and an open. DC voltage checks seem fine. I've scoped the rails and all's well there, too; nice and stable. Anyone have any idea what's going on here? - Jinxie
Started by Jinxie @ · Most recent @
An Interesting find: HP Strobeline Demonstrator 7
I recently purchased this rare HP item off of eBay. It appears to be a trade show demonstration unit for selling HP's alphanumeric LED display modules. It is from 1970 (based on the date codes of the parts) and is made to a very high standard. As received it needed a very good cleaning to remove "residue of rodents" but once cleaned seemed to basically work without any repairs. The only remaining problem is a worn-out "DATA ENTER" switch but I found an exact replacement on eBay and will get that going as soon as the part arrives. This same unit is on page 3 of the July 1970 HP Journal (https://vtda.org/pubs/HP_Journal/HP_Journal_1970-07.pdf) and the corresponding article describes it in pretty good detail, although without schematics. All the ICs appear standard except for a mask ROM, and, of course, the HP display module itself. I am posting this here to document this rare item's existence and in the hopes that a former HP employee may be able to provide some more information on it.
Started by medasaro @ · Most recent @
Looking for source or substitute for hp 1854-0567 Transistor 2
I am working on upgrading a 98543A graphics card to a 98545A for my HP 9000 380. It involves adding a bunch of memory and adding some missing parts. One part I am having a hard time finding is a source for 2 1854-0567 Transistors. Apparently this was an HP special. since it does not show up on any of the cross-reference lists I have been able to find. (annoyingly, I can find the 1854-0566 and 1854-0568 ones). Does anyone here know of a source of these magical parts or even better, a commonly available substitute? Thanks, Henry
Started by hvontres @ · Most recent @
Fail over input board for the HP-5087A distribution amplifier 3
Recently saw a you tube video of an HP-5087A with an HP designed (I think) fail over amplifier board. I have never seen any documentation on the board before. The board takes a signal from two of the input channels, say A and B and if the A input fails fails, it switches over to the B input. Going to try a modernized version shortly if there is any interest.
Started by Ed (scskits) @ · Most recent @
Looking for documentation on 4263A LCR meter 3
Hi all, I'm currently on the search for the Operation Manual (p/n: 04263-90000) and the Service Manual (p/n: 04263-90031) to suit the 4263A LCR Meter. I have the 4263A Users Guide (p/n: 04263-90001) from the files section here, and all the 4263B manuals, but the two for the 4263A mentioned above seem a bit elusive. Does anyone have a copy of these two that they could send through or upload to the files section? Thanks! Jared
Started by Jared Cabot @ · Most recent @
HP - a summary of what went wrong. 13
Please check this link for a description of a breakdown of HP’s process to destroying a great company. https://www.linkedin.com/pulse/hps-trillion-dollar-paradox-wealth-what-left-behind-mark-murphy-g5j9c Don Bitters
Started by Don Bitters @ · Most recent @
HP 70004A with Video DRAM error 17
Hello all 70000 users, I am the luckey new owner of a really clean 70004A that is throwing a video dram error. Does anyone know how to narrow down where this fault could be coming from? There are 16 Drams all hanging on the data bus(s) (dual port ram) so it is hard to determine if it is one chip causing the issue. All the other tests pass fine so I think the busses are ok. Acording to the service manual, on power up it write to then reads a bit pattern to all the memoy locations. Any ideas? I looked at all the pins on all the rams and do not see any stuck logic levels. Does anyone have a good A5 board as that is the service manual recommendation for this fault. Regards, Tom
Started by tmiller11147@... @ · Most recent @
8566B Performance Verification with 8620C 8
I have been puttsing through the 8566B Performance Tests and Adjustments manual for fun and am wondering if I can use an 8620C (with associated plugin) for the frequency response check instead of the 8340 series. To me, it seems the main thing you need is a nice flat sweep at -10dBm. However, I am an RF neophyte and have never used a dedicated sweeper. 8566B flatness performance requirements (at -10dBm): 0.06 to 2.5 GHz is 0.6dB 2 to 12.5 GHz is 1.7dB 12.5 to 20 GHz is 2.2dB 20 to 22 GHz is 3dB 8620C flatness with 86222A (0.01 to 2.4 GHz) is 0.25dB internally leveled and 0.1dB externally leveled. 8620C flatness with 86290B (2 to 18.6 GHz) is 0.7dB to 0.9dB internally leveled and 0.15dB externally leveled. Seems to be within the spec up to 18.6 GHz. 86222A hits it on the lower frequencies even with internal leveling. However, I am not sure about getting these specs at an output of -10dBm. Do I need an attenuator? Will this compromise the output flatness? Seemed worthwhile to compare the 8620 to the quoted 8340A. However, from a quick glance at the 8340A spec sheet, it is not as straightforward for externally leveled info. For the internally leveled flatness at output power of -10dBm it quotes 0.9dB (0.01 to 2.3 GHZ), 1.6dB (2.3 to 20 GHz), 2.1dB (20 to 26.5 GHz). So, this makes sense why you need to have the 8340 externally leveled in order to be within the flatness spec of the 8566B. As a side note, it is interesting to view the progression from "Sweep Oscillator" to "Synthesized Sweeper" in the HP Catalogs and how it really seemed to be a game changer. Thanks for any insights! -Michael Bierlein
Started by Michael Bierlein @ · Most recent @
Power Sensor Calibration Labels 17
Hello, Does anyone know which label type/model was used for the power sensor calibration table on the backside of the sensor? I am trying to find some labels that are similar with those but without any luck. I measured the label on the 8481A and it has around 55*27mm. I am not sure how were those printed because they seem to be a laminated type and the table seems to be printed on the inner layer. Doesn't look like they were printed on a standard laser printer. Are those thermal labels? Thanks, Razvan
Started by Razvan Popescu @ · Most recent @
2955 alarm? 3
So I turned on my 2955 today and this is what I’m seeing/ hearing. https://youtu.be/YOxBFDfVzgk?si=qu8sqjoLKhAohL1- Andrew
Started by KB2LMN @ · Most recent @
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