Fluke Biomedical VT305 - Manual (Page 55)

Gas Flow Analyzer
Measure Respiratory Data
41
Note
Flow cannot be used here as a trigger. The
pressure curve must be used.
Pressure Curve Upstream of the Y-Piece
For the pressure curve shown in Figure 41, the standard
triggers can be used: (> 1 mbar / < 1 mbar).
gyo043.jpg
Figure 41. Upstream Pressure Curve
Note
The trigger is significantly higher than the noise of
the base line. If not, the trigger value must be
increased.
Special Cases
In measurement technology there can always be a
deviation from the standard variants to get a more
accurate result. You can get very accurate results with the
settings shown in this manual, which is better than the
accuracy of all respiratory equipment.
Measurement errors inherent in the overall system occur in
the respiratory apparatus and in the Product. The values
shown in the display can be different because not the
same thing was measured and compared.
Inspiration Volume Vti
If the breath curve shows a plateau or a break, a tiny flow
can be measured during this time. A lot of breathing
equipment does not include these tiny flows when they
calculate Vti. You can match this behavior in the Product
when you use the trigger values that follow:
In Figure 42, S shows the start trigger and E the end
trigger.