Table. 3—

Summary of equipment quality control

TestMinimum intervalAction
VolumeDailyCalibration check with a 3-L syringe
LeakDaily3 cmH2O (0.3 kPa) constant pressure for 1 min
Volume linearityQuarterly1-L increments with a calibrating syringe measured over entire volume range
Flow linearityWeeklyTest at least three different flow ranges
TimeQuarterlyMechanical recorder check with stopwatch
SoftwareNew versionsLog installation date and perform test using “known” subject