Nice clear photos, thanks very much
Sorry,your last posts came in after bed time, yes I think that gives me everything I need so you're safe to button it up again.
It looks like they did a fair bit of redesign there, and revised the layout quite significantly. And no trace cuts now (that I noticed), for example. I think they did swap in a LOT heftier v-reg for U25, compared to what I recall on your board.
It looks like a nice tidy clean-up pass. If they've been doing such active work on the board in the past year it looks as if they see some ongoing life in it (hopefully s/w too, although it seems clean now). I see they've kept the RS232 port footprints too
Losing (my) U29 has tidied up the front end nicely so it possibly has lower crosstalk. I wonder what it was... My only thought is that it might have been an analog mux for an abandoned single channel 200MSps experiment. As you say, no trace cuts - the control tracks across the board have been deleted.
Your U29 is new, I must look at what that does. It must be s/w transparent with mine (but maybe different firmware - to free up some GPIOs?).
Interesting regulator change (LM337 -ve?), it looks as if they did have issues with the equivalent reg on mine because there is rework around it - I must look closer look at noise / temp to see if it is worth a (slightly messy) retrofit.
It's a shame about the twisted shield, I don't think the PCB slot sizes are big enough to twist that far so it looks as if they may have needed to remove the tab at that end (misplaced hole?) and replace it with the copper strap. It hopefully doesn't have any performance impact anyway. Maybe they've just bent the tab up, resulting in the poorer board spacing, might be possible to rectify (after warranty?)
In a practical sense, no. Even with USB1, it could forward ~150 captures/sec. Which is faster than they'd be updated on screen. In a theoretical sense, yes. With USB2, up to 3,000 captures/sec could be uploaded to the PC, which could be useful if they were merged into a variable persistence display, for example.
Ah, good point, I wonder if it enumerates as USB1 or USB2? It's hopefully possible to tell.
I really appreciate your taking the time to do this Mark, I owe you one
EDIT: Ah, got it now! My U29 was the mux to select the Video trigger source (obvious when I saw the track difference on yours
). hence the jumper on only one side of the footprint, I must have partially coupled the channels when I tried to jumper the other side. The s/w pops up a message saying Video trigger only supported on Channel 1 when you try to set it to Chan 2. It must have compromised performance too much in other areas - a fair trade-off. Glad I understand it now anyway.