Comments on: HP 54645D 100-MHz Mixed Signal Oscilloscope

By: Tomi Engdahl

Tomi Engdahl — Mon, 08 Dec 2025 00:12:37 +0000

Gaming with oscilloscope
https://youtube.com/shorts/LXTX5l72l3w?si=tN63XyroSZjCZNJr

By: Five Nights At Freddy's

Five Nights At Freddy's — Mon, 29 Sep 2025 05:02:31 +0000

That old HP scope seems impressive! Does anyone else use vintage digital scopes? I’ve got an old Tektronix that still works wonders for basic circuit analysis. It’s a bit clunky, but reliable! I wonder if a certain animatronic bear could be diagnosed using one of these oscilloscopes?

By: Tomi Engdahl

Tomi Engdahl — Wed, 23 Jul 2025 11:42:55 +0000

I did a followup video that used the HP scope to its limits of performance, again in xy mode. https://youtu.be/IUG0-F3Qgyk

By: Tomi Engdahl

Tomi Engdahl — Wed, 23 Jul 2025 11:25:46 +0000

Someone mentioned in an earlier post that digital scopes are no good in xy mode. This link points to a video about a very simple 3-port VNA fixture I made to test a low loss, wide band balun. The setup was based around an old HP 54645D oscilloscope in xy mode. https://youtu.be/Bc4mT_oOxRQ This 100MHz scope was still displaying usable results at >400MHz.

https://www.facebook.com/share/p/1CbXVdYkUS/

By: Tomi Engdahl

Tomi Engdahl — Wed, 18 Jun 2025 11:53:49 +0000

Capturing Screenshots Using A Fake Printer
https://hackaday.com/2025/06/17/capturing-screenshots-using-a-fake-printer/

If you have very old pieces of analogue test equipment with CRTs on your bench, the chances are they will all have surprisingly similar surrounds to their screens. Back when they were made it was common to record oscilloscope screens with a Polaroid camera, that would have a front fitting for just this purpose.

More recent instruments are computerized so taking a screen shot should be easier, but that’s still not easy if the machine can’t save to a handy disk. Along comes [Tom] with a solution, to hook up a fake printer, and grab the screen from a print.

Old instruments come with a variety of ports, serial, IEE-488, or parallel, but they should usually have the ability to print a screen. Then capturing that is a case of capturing an interpreting the print data, be it ESC/P, PCL5, Postscript, or whatever. The linked page takes us through a variety of techniques, and should be of help to anyone who’s picked up a bargain in the flea market.

Making Screenshots of Test Equipment Old and New
https://tomverbeure.github.io/2024/11/29/Making-Screenshots-of-Test-Equipment.html

By: Tomi Engdahl

Tomi Engdahl — Thu, 26 Jan 2023 21:50:32 +0000

The “easter egg” game started in the same way as Tetris on some other oscilloscopes in this product series
https://hackaday.com/2014/04/26/playing-tetris-on-an-oscilloscope/
https://imgur.com/a/343yN