Fluke VT Plus HF, Operator'S Manual

Page: 38 / 134

VT Plus HF
Operators Manual
4-6
To enter a barometric pressure value, follow these steps:
1.
Enter the settings screen from the setup menu.
2. Use the
∧
and/or
∨
soft key to highlight the line labeled BAROMETRIC PRESS .
3. Press the soft key below MODIFY
.
4. Use the numeric keys to enter the barometric pressure in mmHg.
5. Press the soft key below ENTER to exit back to the menu options, or the ESCAPE
soft key to cancel the change and return to menu options.
Note that the VT PLUS HF accepts barometric pressure values between 0 and 999
mmHg. No decimal values or fractions of a mmHg are allowed.
Breath Detection
The VT PLUS HF can be used to measure parameters on a breath-to-breath basis. To
measure breath parameters, the mode of breath detection must be set. The breath
detection options are as follows:
Bi-directional breath detection : Use this breath detection mode when
analyzing both inspired and expired breath data or when the VT PLUS HF
is connected between the load (lung simulator) and the Y-piece in the
breathing circuit.
Uni-directional inspired only: Use this breath detection mode when the VT
PLUS HF is analyzing only inspired breaths or when the VT PLUS HF is
connected in the inspired limb of the ventilator breathing circuit.
Uni-directional expired only : Use this breath detection mode when the VT
PLUS HF is analyzing only expired breaths or when the VT PLUS HF is
connected in the expired limb of the ventilator breathing circuit.
Off Use this mode to measure continuous flow and volume without attempting
to detect breaths. Use this mode to integrate a flow over a long period of
time.
To select the breath-detection mode, follow these steps:
1.
Enter the settings screen from the setup menu.
2. Use the
∧
and/or
∨
soft key to highlight the line labeled BREATH DETECT .
3. Press the MODIFY soft key until the desired option is displayed.
4. Press the BACK soft key to exit back to the setup menu options.
Breath Detect Threshold
The VT PLUS HF breath detection algorithm uses a flow rate threshold that the flow must
cross to trigger a change in the breath phase. Higher flow rate thresholds yield less
sensitive breath detection. Lower thresholds yield more sensitive breath detection.