H4-EN Calibration P
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Analysis of the volume calibration results
Analysis of the calibration results is essential to ensure an accurate volume/flow
measurement by the system.
Flow-volume loop
During the calibration process, the flow-volume loops are displayed, the volume is on the
horizontal axis and the flow is on the vertical axis. There should be no drift on the horizontal
axis as shown below. A major drift is the sign the calibration is not acceptable and a
verification of the system is required.
Traffic lights signification
During the calibration process, two calibration factors are calculated, one for inhaled
volume, one for exhaled volume. The traffic lights indicate the deviation of the calibration
factors relative to the factory (reference) calibration.
Deviation less than 5%. The calibration is good and the system can be used.
Deviation between 5 and 10%. The calibration is acceptable but a verification
of the system is recommended.
Deviation greater than 10%. The calibration is not acceptable.
A verification of the system is required.
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