What is Digital Touch when it comes to showing vibration patterns?

Hello all,
I'd like to know how to use the Digital Touch features of either the watch or the iPhone. This is just for my own further research on Apple stuff for accessability issues--nothing IRB or anything. Anyway, I'd like to share a specific haptic pattern with the Apple Accessibility team. I'm discovering this pattern with my Watch S2. Can the Digital Touch only help you describe your heartbreat and share that? or can it help you describe other patterns like the one I'm experiencing? I will try to describe it as best I can, though. I receive three long vibrations, a pause, and from 1 to about 9 short taps in a row. that's the first part of this strange pattern. the second part consists of from 1 to 3 short taps in a row, a pause, three long vibrations, a pause, and up to 9 at least of the short taps again. VoiceOver doesn't speak when these occur, and I've put it to wrist detection? The reason why I say this is because when I'm charging my watch complete with the special cloth-covered band I also found in the box--watch band wraps around this, watch unit sits on top of opening--I feel one of the two patterns described after a while. could I be correct in thinking this? Why, then, would it be detecting my wrist when I'm wearing it? I do have smaller wrists and things, and the band's not tight at all for breathing room of the skin beneath. I only tighten up when working out.
Thank you,
Ashleigh Piccinino
P.S. In order for you to get a sense of how these patterns work, I'd have to know about the dt thing and whether it can be used with VoiceOver or not.