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Re: E5052A Power On Test (3.3V Bus Supply)
Hi Jim, thanks. I obtained the cal certificate for the other E5052A today. It was calibrated less than a year ago and this one shows an even lower noise floor.? It's a slightly newer unit and it has
By jmr · #150647 ·
Re: HP 3403C True RMS Voltmeter display fault
Hi AArnaud, Congratulations for the successful repair, and for having saved another valuable HP instrument from the scrap heap ! My conclusion is somewhat identical to my initial thoughts : start by
By Joel Setton · #150646 ·
Re: HP 3403C True RMS Voltmeter display fault
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 |
By Paul Amaranth · #150645 ·
Re: HP 3403C True RMS Voltmeter display fault
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
By ed breya · #150644 ·
Re: HP8510C TRL Calibration
Out of curiosity, did you have any speed optimization enabled on your IEEE-488 interface? What software version was your 8510C running?
By Ed Marciniak · #150643 ·
Re: HP8510C CalKit file .CK_ format
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
By Marcus Gustafsson · #150642 ·
Re: HP 3403C True RMS Voltmeter display fault
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
By Dave McGuire · #150641 ·
Re: HP 3403C True RMS Voltmeter display fault
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
By Dave McGuire · #150640 ·
Re: HP 3403C True RMS Voltmeter display fault
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
By ed breya · #150639 ·
Re: HP 3403C True RMS Voltmeter display fault
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
By ed breya · #150638 ·
Re: 3708A Noise and Interference Test Set - Looking for a Service Manual
Fantastic! That's exactly what I was looking for. Thanks a bunch, greatly appreciated! :) Regards, Jared
By Jared Cabot · #150637 ·
Re: HP 54512B (pair) repair
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:
By Michael Bafaro · #150636 ·
Re: HP 54512B (pair) repair
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
By Radu Bogdan Dicher · #150635 ·
Re: HP 54512B (pair) repair
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
By Michael Bafaro · #150634 ·
Bricked E1439C after firmware update on 89600
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
By Ed Marciniak · #150633 ·
Re: HP Agilent 8753ES VNA repair [Help]
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
By MattSNE · #150632 ·
File /All HP, Agilent and Keysight instruments in folders by part numbers/3000 to 3999/3708 Noise and Interference Test Set/HP 3708A Service_Manual.pdf uploaded #file-notice
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
By Group Notification <noreply@...> · #150630 ·
Re: 3708A Noise and Interference Test Set - Looking for a Service Manual
Hi Jared, Just uploaded service manual for 3708A to the 3000 group. Regards Gerald VK3GM
By Gerald · #150629 ·
Re: HP Agilent 8753ES VNA repair [Help]
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.
By Yves Tardif · #150628 ·
Re: HP Agilent 8753ES VNA repair [Help]
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
By Yves Tardif · #150627 ·