Dräger NAD Operator's Instruction Manual page 19

4. After the pressure calibration is complete, the monitor will display
PRESS OK and 0000 .
5. Within three seconds, the monitor will display FLOW OK and 0000,
indicating that it is establishing the zero set points for the two flow
channels (Plus and Minus Flow).
6. After the tidal volume calibration is complete, the monitor will display
TIDAL VOL and ----.
7. Finishing this sequence indicates that the monitor has successfully
completed both pressure and tidal volume zero calibrations and will
achieve pressure and volume accuracy specifications.
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Operating Instructions
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