Check that the Inhalation Pressure and Exhalation Pressure displays on the Hardware screen read within ± 10% of the analyzer display.

Example: If the analyzer’s display reads 98.7 cmH2O, 10% of the display is 9.87 cmH2O, and ± 10% of the analyzer display would be 88.83 to 108.57 cmH2O (-10% = 98.7 - 9.87 = 88.83 cmH2O, and + 10% = 98.7 + 9.87 = 108.57 cmH2O).

Information found of page 8-21 of the Service Manual.