Summary of equipment quality control
| Test | Minimum interval | Action |
| Volume | Daily | Calibration check with a 3-L syringe |
| Leak | Daily | 3 cmH2O (0.3 kPa) constant pressure for 1 min |
| Volume linearity | Quarterly | 1-L increments with a calibrating syringe measured over entire volume range |
| Flow linearity | Weekly | Test at least three different flow ranges |
| Time | Quarterly | Mechanical recorder check with stopwatch |
| Software | New versions | Log installation date and perform test using “known” subject |