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I've be watching this chain with someinterest. The thing that occurs to me is why are we all helping him go down the rabbit hole? I've owned or worked on something like 25 8566 A and B instruments,

Dave, Adding ferrite beads to the ground lead itself will probably make things worse. However, threading the entire probe cable several times through a large ferrite can often help reduce noise due to

Many thanks, guys. Seems like the consensus is to look into the ground issues. It's getting very late in my part of the world right now so I shall retire and take a fresh look at these things Tuesday

OK, found: pressing the right mouse button a menu appears with also the item to delete the track. -- Cheers Attilio

First, make sure that you don’t have any ground loops. I suggest you to power the 8566 and your scope from the same outlet. Best, Francesco K5URG Sent: Sunday, February 27, 2022 4:00 PM To:

I'm looking at the schematic for the HP 3048A option K23 DC blocking filter. I've attached a simplified version of this schematic for convenience. Note that I've omitted the circuitry related to

Diskette images may be found at http://www.bitsavers.org/bits/HP/1650/

All: While going through the Firmware Revision notes, I found an interesting entry on Version 7.66 of the firmware: - Added ripple limit and bandwidth limit tests - Added JPEG and CSV (Comma Separated

If the spikes are at line frequency, then I'd suggest turning off LED or Fluorescent lamps and see if it makes a difference. You could always remove the ground wire, and use the probe as a sniffer to

You could try slipping a few ferrite beads on the probe's ground lead. I'm not sure that'd help, but it might; does anyone else have any thoughts on that? -Dave -- Dave McGuire, AK4HZ New Kensington,

Okay, that's all understood now and thanks for the clarification, guys. In order to properly eliminate the possibility of these spikes being a red herring I'm going to have to get creative with the

If you have a PC with a 3.5-inch floppy drive that you can set up to boot into real mode DOS to create floppies from ImageDisk images, there are some 1650A disk images here:

Radu and all, I did come across the “microprecision” website but have not contacted them. From past experience I have had little luck dealing with these sorts of business because they want for you

All, I am in dire need of a boot diskette for an HP 1650/1651 Logic Analyzer (Rev. 1.00) which I have restored. I have (so far) been unsuccessful in finding one. Should anyone have one to spare or

Thanks Yes, I see what you mean.? I too understood that mask programming the main counter processor was expensive and HP likely purchased a lifetime supply of the 1820-2131 parts.? There is,

I am now editing those files inside of the 7470 emulator. I have also been able query the VNA at Address 16 for them using this toolkit. Looks like I can choose from a great many formats besides .bmp

John's 7470 program will render an HPGL file which you can capture as a .BMP file and then tweak in your computer such as to add a box border.

It seems pretty reasonable to me, the 1820-2131 seems to be the main processor running two pretty similar counters that where likely designed at the same time, the one big difference being the 5316

Searching the service manuals for the HP5315A/B, HP5316A and HP5316B counters, I noticed that the part number specified for the microcontroller is the exact same:? 1820-2131.? Since these are all

I have mostly RF switch plug ins that i use but i have some terminal plugs laying around that might fit