Fluke Biomedical VT Plus HF - Manual (Page 40)

VT Plus HF
Operators Manual
2-12
4. Press the ENTER soft key to save the change or the ESCAPE soft key to cancel the
change.
5. Press the BACK soft key to return to the Settings menu.
Inspiratory/Expiratory Tidal Volumes
The Analyzer measures tidal volume when performing ventilator measurements. This
option allows the user to choose between the expiratory or the inspiratory tidal volume.
The default setting is inspiratory.
Note
This setting applies only when the bi-directional breath-detection mode is
selected.
To change between inspiratory and expiratory tidal volume:
1. From the
Gas Settings menu, highlight Bi-Dir Tidal Vol .
2. Press the MODIFY soft key to toggle to the desired value.
3. Press the ENTER soft key to save the change or the ESCAPE soft key to cancel the
change.
4. Press the BACK soft key to return to the Settings menu.
Zero Mode
All pressure and differential pressure (flow) sensors in the Analyzer must be periodically
zeroed or calibrated to a zero reference. This zero function can be set to occur
automatically at pre-determined intervals or only when the user requests the function by
pressing the key labeled ZERO/7 . When a zero occurs, valves inside the device open the
sensors to ambient pressure and measure the zero value to be subtracted from future
measurements.
Note
Because no breath parameters are calculated for any breath in which a
zero occurs, it may be desirable to turn off automatic zeroing for a short
while during a critical test.
To turn automatic zeroing on or off:
1. From the
Gas Settings menu, highlight Zero Mode .
2. Press the MODIFY soft key to toggle to the desired value.
3. Press the ENTER soft key to save the change or the ESCAPE soft key to cancel the
change.
4. Press the BACK soft key to return to the Settings menu.