Run 2026-07-06 13:08: stepping 78->80V released the 46A load mid-ramp,
the supply output overshot to 80.46V and a protection (OVP by all log
evidence) shut it down; the sweep then logged garbage rows for the rest
of the grid. Three fixes:
- release the load down to l_start BEFORE each supply voltage step
(down-steps only; descending load sweeps keep the gated path)
- OVP preflight: query the programmed OVP level at sweep start, abort
under 2V margin above the sweep max, warn under 5V
- dead-supply abort: supply readback ~0V mid-sweep drops the garbage
point, queries which protection fired (OVP/OV/OC/OP/OT) via
_supply_trip_cause, reports it, and stops -- collected points are
still ramped down and saved
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
