Merge pull request #156 from lsst-ts/tickets/DM-46003

DM-46003: Increase minimum exposure time for electrometer in ATCalsys

doc/news/DM-46003.feature.rst

@@ -0,0 +1 @@
+Increase minimum electrometer exposure time to 1 second for Keithley electrometer

python/lsst/ts/observatory/control/auxtel/atcalsys.py

@@ -310,6 +310,7 @@ async def _calculate_electrometer_exposure_times(
  electrometer_buffer_size = 16667
  electrometer_integration_overhead = 0.00254
  electrometer_time_separation_vs_integration = 3.07
+ keithley_min_exptime = 1.0
 
  electrometer_exptimes: list[float | None] = []
  for exptime in exptimes:
@@ -319,13 +320,19 @@ async def _calculate_electrometer_exposure_times(
  * electrometer_time_separation_vs_integration
  ) + electrometer_integration_overhead
  max_exp_time = electrometer_buffer_size * time_sep
- if exptime > max_exp_time:
- electrometer_exptimes.append(max_exp_time)
+ if exptime < keithley_min_exptime:
+ elec_exptime = keithley_min_exptime
+ self.log.info(
+ f"Electrometer exposure time increased from {exptime} to {keithley_min_exptime} sec."
+ )
+ elif exptime > max_exp_time:
+ elec_exptime = max_exp_time
  self.log.info(
  f"Electrometer exposure time reduced to {max_exp_time}"
  )
  else:
- electrometer_exptimes.append(exptime)
+ elec_exptime = exptime
+ electrometer_exptimes.append(elec_exptime)
  else:
  electrometer_exptimes.append(None)
  return electrometer_exptimes