Naris
Naris
User’s
Manual V14 14/02/20 Page 28 of 52
FACTORS WHICH AFFECT ACCURACY
Measurement accuracy and repeatability will depend on the following:
Calibration:
Perform a calibration at least twice a day
Temperature:
Use equipment in controlled conditions
between 20°C & 23°C
External noise:
Use equipment in conditions where the
background noise is below 65 dB
Angle of probe (relative to the head):
Aim for floor of nose
Rigidity of probe:
Doesn't move
Effect of probe on the nose:
Avoid distortion
Patient co-operation:
Hold breath during measurements
Nosepiece/nose seal: Use gel and careful positioning to ensure a good
seal.
Check for leaks/Distortion:
Repeat test at least twice if not 3 times and
check for variation, i.e. apply/remove probe
2 or 3 times, testing each time and compare
results.
The Acoustic Standardisation Committee have now reported on the measurement and this
is referred to on page 4 of this manual.
