How do I perform a dark voltage measurement on mOPM and how often should it be done?

1) Install metal cap (AC100) on OPM detector 2) Open the MAP GUI 3) Go to the mOPM detailed view 4) Click the "Perform Dark" button This should be performed every few months or when there is a significant change in environmental conditions (i.e. temperature changes by more than +/-3°C).