On Mon, Mar 17, 2025 at 06:17 PM, Giuseppe Marullo[iw2jww] wrote:
Yes, but according to the manual,should have a different designation,
not "A/B TRIG" but "A/B MENU", also B TRIG options seems different.
Options manual at
and my 2465B with option 9 (CTT/WR) shows "A/B TRIG"
...
This is an image(awful) of the manual:
That picture doesn't look like a 2465B. Timebase knob and trigger area looks different.
Anyway, I will try to activate the function to see if it works, simply
pressing the A/B Trig won't work, probably I need something connected.
You can check if you have CTT and WR by pressing "MEASURE". If you have "COUNTER" menu at top right you have CTT. In addition if you press <MORE> and see "WR-RADIX" menu you have CTT+word recognizer. If you have any errors during boot up you can clear most of them temporarily by pressing A/B TRIG button.
There is a test mode (Buffer exercise F1) that shows list of options but it doesn't distinguish between CTT vs CTT+WR. Another indicator is the 6 pin LEMO connector at the back for WR probe, assuming someone didn't swap the boards inside.
Regarding Dallas NVRAM replacement: I recently removed a 34 year old Dallas NVRAM from a 2465B, it still showed 3.1V battery voltage. They last quite a bit longer than 10 years. I recommend a low profile precision socket and another Dallas part from a reliable source like Digikey/Mouser. I also did the FRAM change for a scope few years back, it doesn't have low voltage detection so it may get corrupted one day. Recently I added a coincell battery holder to another Dallas chip and I like it better than the FRAM solution.
Ozan
