PX-12 Harrow rev B [up]
Bring-up log for entry #15, 16-channel acquisition, first power 2026-03-19.
| board | PX-12 Harrow (16-channel acquisition) |
|---|---|
| revision | rev B |
| state | [up] |
| first power | 2026-03-19 |
| closed | 2026-04-02 |
| owner | Ilse Vantorre |
| outstanding | ADC reference drifts above 60 C |
Journal
2026-03-19 first power
Minimum population, limited supply. Rails up and in band; loader ran on the first try, console clean at 115200. Strap pins matched the schematic pin for pin. Promising board.
2026-04-02 closed
Full peripheral walk passed and 24 h soak flat. Closed as up. One note parked for watching: the on-chip ADC reference looked a touch warm-sensitive but was inside tolerance at room temperature.
2026-05-30 correction appended
Field unit came back reading 1.5% high on the analogue inputs in a hot cabinet. Reproduced on the bench: the ADC reference drifts above 60 C, out of the datasheet's own graph. Root cause is the reference part, not the layout. Logged as the board's standing outstanding item; rev C should move to an external reference.