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I recently had one destroy itself on an HP 16717a logic blade. Burned all of the way through the pcb, great fun. I guess that was early 90s vintage. Paul -- Paul Amaranth, GCIH |

I know what you mean Dave. I've seen soldery-looking stuff on some blown dipped Ta caps - the ones that haven't been burnt to a crisp. There is some solder in those too I think, for connection to the

Out of curiosity, did you have any speed optimization enabled on your IEEE-488 interface? What software version was your 8510C running?

Hi Calvin, Here is what I use for my HP8753D and 8720C, https://github.com/mankangustafsson/gpib_playground/blob/master/vna_calkit.py Basically I'm using GPIB to define a new calkit on the unit, then

I usually "replace like with like", or at least a modern equivalent. You should see all the problems that come up with people with no electronics knowledge on the vintage computing mailing lists

On 3/3/25 12:41, ed breya wrote: > That's an interesting picture of the failed cap. I'd guess the molten blob on the can end is just some electrical solder that ended up there by coincidence sometime

I forgot to comment on hermetic solid Ta caps. I have seen only a few failures of these over the years, and I consider them among the best of parts for reliability. I have seen lots and lots of

That's an interesting picture of the failed cap. I'd guess the molten blob on the can end is just some electrical solder that ended up there by coincidence sometime in the past, or maybe from inside

Fantastic! That's exactly what I was looking for. Thanks a bunch, greatly appreciated! :) Regards, Jared

Radu, I wish you luck finding a replacement for the line filter and switch. Mike Sent: Monday, March 3, 2025 10:23 AM To: [email protected] Subject: Re:

Mike, This is unrelated with the issues I'm having with the -12V rail. When disassembling/reassembling the scope, the EMI Filter (more specifically, its built-in switch) and the HP arm/button broke

Radu, The pictures you sent appear to be the AC line filter (EMI) and the power switch and perhaps the line fuse. If one of the supplies is off and the others are working, then the problem is

Following a firmware update which showed no errors, my E1439C no longer shows up in the VXI resource manager. Does anyone happen to have an image of the 28F800 flash chip, insight on how to extract

Hello Yves, Thank you for all the pictures and all the measurements. I understand the board better with your annotations. The frequency synthesizers and PLL is not the easiest part to understand. I

The following items have been added to the Files area of the [email protected] group. * /All HP, Agilent and Keysight instruments in folders by part numbers/3000 to 3999/3708

Hi Jared, Just uploaded service manual for 3708A to the 3000 group. Regards Gerald VK3GM

I took some measurements of the PLL VCO, you can compare. On the oscilloscope, I put a slight offset for CH1, to be able to better distinguish the two input signals to the phase detector.

Hi, Here is the part of the circuit inside the shield. It is very similar to the schematic and PCB of an 8753D, but the mixers are different. Yves

I guess I'm looking for a Delta Electronics 03EB3S-1 (9135-0452) switched EMI filter (see pic enclosed). It came apart as soon as I tried to see what's wrong with it. Thank you in advance for digging

Two steps forward, one step back (one and a half?). While other things have been progressing, the power switch stopped working once I put most of the unit back together. I enclose some pictures,