increase measurement height when not using vial

hardware-testing/hardware_testing/gravimetric/config.py

@@ -58,7 +58,6 @@ class PhotometricConfig:
 NUM_BLANK_TRIALS: Final = 3
 NUM_MIXES_BEFORE_ASPIRATE = 5
 SCALE_SECONDS_TO_TRUE_STABILIZE = 30
-SCALE_Z_DISTANCE_TO_AVOID_STATIC = 50
 
 LOW_VOLUME_UPPER_LIMIT_UL: Final = 2.0
 

hardware-testing/hardware_testing/gravimetric/execute.py

@@ -325,6 +325,7 @@ def _run_trial(
  mix: bool = False,
  stable: bool = True,
  scale_delay: int = DELAY_FOR_MEASUREMENT,
+ measure_height: float = 50,
 ) -> Tuple[float, MeasurementData, float, MeasurementData]:
  pipetting_callbacks = _generate_callbacks_for_trial(
  recorder, volume, channel, trial, blank
@@ -362,7 +363,6 @@ def _record_measurement_and_store(m_type: MeasurementType) -> MeasurementData:
  print("recorded weights:")
 
  # RUN INIT
- measure_height = config.SCALE_Z_DISTANCE_TO_AVOID_STATIC
  pipette.move_to(well.top(measure_height).move(channel_offset))
  m_data_init = _record_measurement_and_store(MeasurementType.INIT)
  print(f"\tinitial grams: {m_data_init.grams_average} g")
@@ -566,6 +566,12 @@ def _next_tip_for_channel(channel: int) -> Well:
  liquid="None",
  )
 
+ # need to be as far away from the scale as possible
+ # to avoid static from distorting the measurement
+ if cfg.labware_on_scale == "radwag_pipette_calibration_vial":
+ measure_height = 50
+ else:
+ measure_height = 120
  calibration_tip_in_use = True
  try:
  ui.print_title("FIND LIQUID HEIGHT")
@@ -628,6 +634,7 @@ def _next_tip_for_channel(channel: int) -> Well:
  mix=cfg.mix,
  stable=True,
  scale_delay=cfg.scale_delay,
+ measure_height=measure_height,
  )
  print(
  f"blank {trial + 1}/{config.NUM_BLANK_TRIALS}:\n"
@@ -704,6 +711,7 @@ def _next_tip_for_channel(channel: int) -> Well:
  mix=cfg.mix,
  stable=True,
  scale_delay=cfg.scale_delay,
+ measure_height=measure_height,
  )
  print(
  "measured volumes:\n"