And the mystery continues
Got busy and left the DP10007 probe running on my SDS1104X-E all day. Brought the probe home and figured I'd just see what happens with my SDS804X HD... It powered right up no problem. Unplugged it and plugged it back in several times, works fine. Powered off the scope and rebooted - works fine
The DP10007 probe is new, but old stock - I think it was produced in 2022 or earlier and yesterday was the first time it was powered on since it was shipped from the factory. What are the odds that some power supply caps went a bit south and running it for 8 hours gave them an Italian tune-up or something? I know that capacitors shouldn't fail like that in just a few years, but with some of the cheap components these days I wonder.
Anyhoo, things are looking good and I ended up ordering some new test gear in the process. I've had worse days
Edit - now that everything is operational I got the chance to use the DP10007 on the vacuum tube scope I'm working on. I know the DP10007 has some CMRR issues from Dave's investigation, but for my use at frequencies <100KHz it actually seems to work quite well, and definitely a lot safer than standard probes in several hundred volt circuits. For the price I paid, it's a bargain