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Recently got an HP 54502A scope to play with and a set of HP 10430A probes. When compensating the probes the adjustment seems to make very little difference. As in almost none. However the probes seem to work fine and the leading edge of the square wave is good. I tried them on a Tek 465 scope with the same result. To see how crazy I was tried a pair of Tek 6106 probes on the HP 54502A and the compensation adjustment worked just as I expected which is to say made a definite difference and had to be set correctly for the square wave to display properly. I at first thought both HP probes were 'bad'; they are after all 'vintage'. But they seem to function. What am I missing here? -- W0MPM John

I just got the following error when going to Didier’s manuals directory: Error: Target directory does not exist. Anyone else tried it recently? Steve

Hi all, I note HP have thoughtfully provided an SMB 'TEST' nipple for the RF sampler section of the analyzer I'm currently working on (HP8754A). However, I'd kind of expected to see a 50 ohm termination in situ there to prevent internal reflections from messing things up. But there is none; just the bare nipple. The manual states I should expect to see a 3Vp-p signal at this port if that makes any difference. Should it be terminated with 50 ohms when not plugged into for testing purposes? Thanks, J.

Hello everyone, Does anyone of you have this “Option 001 GATED SWEEP" firmware for the HP3585B? A82U11 03585-60330 (New 03585-60336) and A82U12 03585-60331 (New 03585-60337) Greetings Rico

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

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

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

Hi all, Sphere Electronics has yet more HPIB cables going cheap. https://www.sphere.bc.ca/recently-added/ Regards, Waz

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

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

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.

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

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