{
  "classification": "SCHEMA_ONLY_NOT_A_MEASUREMENT",
  "record_fields": {
    "pair_id": "P01",
    "run_id": "P01-1",
    "condition": "warm",
    "elapsed_s": "number, monotonic within each run",
    "record_order": "integer, frozen run order",
    "mass_flow_g_s": "number, positive calibrated mass flow",
    "head_Pa": "upstream total pressure minus outlet static pressure",
    "inlet_K": "warm inlet air temperature",
    "outlet_K": "outlet temperature",
    "outlet_absolute_Pa": "absolute outlet pressure",
    "wall_K": "array of four wall temperatures",
    "dewpoint_K": "upstream dry-air dewpoint",
    "blower_W": "measured electrical input",
    "cooling_W": "measured thermal-controller electrical input",
    "pump_W": "measured coolant pump input",
    "trim_heater_W": "measured heater input",
    "prestable_s": "continuous time before measurement satisfying thermal drift criterion",
    "prestable_wall_drift_K_min": "maximum absolute fitted wall temperature slope in the stabilisation period",
    "quality_note": "empty string if no operator exception; otherwise reject and retain"
  }
}