Datex-Ohmeda Aespire 7900 User's Reference Manual page 54

Aespire 7900
Step 1
Push the Menu key to see
the main menu.
Step 2
Turn the knob to select the
Calibration screen.
Step 3
Push the knob to show the
next screen.
Step 4
Turn and push the knob to
select O Sensor Cal.
2
Step 5
Select 21% then push the
knob.
3-6
1009-0633-000