Use the distribution, sample count and dropouts together; a single peak is not the result.
IP-MSE-01 / MOVE / 5 BUTTONS / WHEEL
Mouse Scroll Wheel Test
Track vertical and horizontal wheel deltas, event count and direction reversals.
Scrolling skips, reverses or moves in the wrong direction.
This focused entry uses the shared Mouse protocol. The measurement logic and Evidence version remain identical to the complete lab.
Remove the easiest false alarms first.
01
Use a desktop browser, keep the tab visible and close high-load tabs.
02
Move continuously on a stable surface; do not compare a slow trace with a fast trace.
03
Keep the same browser, Pointer API and connection path for repeat comparisons.
Run one repeatable protocol.
- 01
Scroll steadily in one direction without reversing by hand.
- 02
Repeat in the opposite direction.
- 03
Inspect event count, accumulated delta and reversal flags.
Evidence the result should expose.
DIRECT / INFERREDWheel X/Y delta
DIRECT / INFERREDEvent count
DIRECT / INFERREDDirection reversal
Separate observed, review and inconclusive.
Repeat under the same motion and load, then compare wired, direct USB and wireless paths one variable at a time.
Browser event rate, click response and pointer capture cannot isolate USB report rate or device-only latency.
Start with the likely path, then retest.
01
Encoder wear
02
Touchpad inertia
03
User direction change
04
OS scaling