Table 4: Equipment Quality Control Summary

Table 4:
Equipment Quality Control Summary
Test	Minimum Interval	Action
Volume	Daily	3-L syringe check
Leak	Daily	3 cm H20 constant pressure for 1 min
Linearity	Quarterly Weekly (flow spirometers)	1-L increments with a calibrating syringe measured over entire volume range (flow spirometers simulate several different flow ranges)
Time	Quarterly	Mechanical recorder check with stopwatch
Software	New versions	Log installation date and perform test using "known" subject
Adapted from reference 4.