Dell UltraSharp UP3221Q User Manual page 61

Scheduler Set schedule for auto calibration or validation. Allows
you to set Scheduler to Off, Calibration, Validation,
or Calibration + Validation.
Schedule Allows you to set the Schedule Sessions to Every
Sessions 200 Hours or at user preferred interval (Quarterly,
Monthly, Weekly, or Daily).
Operation Allows you to set the Operation Mode to Prompt
Mode before starting session or Carry out in sleep mode.
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Operating the Monitor 61