Hi Attila,
Yes, I see that Scope and Scripting can do it, thank you. But I want to get it working in Logger. This is because I have signal changes that occur in the 10 ns to 100 ns timescale, but these occur in response to inputs that change over 0.1 s to 10 s. The Record mode in Scope seems limited by buffer size. Is it any better in Logger? I also want to log the difference between Ch1 and Ch2, and preferably calculate the AC RMS, Peak2Peak, rise/fall time of that difference in Logger. Those calculations are trivial in Scope. Any advice would be appreciated. I'll keep trying in the meantime. Thank you. Regards, Grant