Thanks! I noticed an example of this is shown in advanced trigger menu of Picoscope.

What do the POSITIVE_RUNT and NEGATIVE_RUNT directions refer to?

Ok, thanks. Might I suggest that such a note is put in the documentation? I spent a little while thinking about this and it would have been helpful to have the docs tell me.

If ps3000aSetNoOfCaptures is set to 1, or ignored, and ps3000aMemorySegments is set to 1, is there any fundamental difference between the 2 modes?

Reading the programming manual, there is some discussion about the rapid block mode versus the block mode. The suggestion is that if you can't do with the several tens of ms delay in setting up the block mode, then you should use the rapid block mode. My question is, why would I ever use the normal ...

So crucially, there is no facility to add an anti-aliasing filter prior to down sampling? This means, the onus is on me to make sure my signal is filtered adequately for whatever sampling frequency I wish to capture in. Correct? To what does the 60MHz bandwidth refer for the 3204A/B models? Is this ...

I hope this provides suitable clarification. Not really - I'm still not clear on what filtering is or can be applied, and how changing the sampling rate changes what filtering is being done. The suggestion to use Picoscope is a little difficult for me as I don't really have ready access to a Window...

Ok, so now I'm just confused. Here is my best attempt at an understanding: The scope always sample at 500 MS/s, but then it's possible to down-sample to some other sample rate that is selected through the SDK. An anti-aliasing filter can be imposed in software or hardware prior to the down-sampling....

But there is likely to be crud in my signal that I want to filter out to stop it aliasing.

Thanks! Presumably changing the time base also changes the anti-aliasing filters? The onus is not on me to make sure the signal is band limited? (forgive me if this is obvious wrt to oscilloscopes!)

Do the scopes sample at 500 MS/s under all conditions, or can I reduce the sample rate? Specifically, 8 MS storage is plenty for me if I can sample at 30 MS/s (but not at 500MS/s). It's not clear to me that this flexibility exists however. Perhaps someone could clarify this? Also, as a prospective c...