DATREND Systems vPad-IV, Operating Manual

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vPad-IV OPERATORS MANUAL
4.8.7 More Settings
Press the More Settings button of the Setup menu ( Figure 43 , page 61) to open the application settings
menu (
Figure 50
).
4.8.7.1 Pressure measurement settings
Use these controls to set the default units of measure for back pressure and occlusion pressure. These are
default settings which are restored each time the app starts up, but which may be changed at test runtime as
required to suit a specific protocol.
As described in Section 4.3.3.6 on page 31, the pressure measurement may be zeroed on each channel
independently. Press the
Pressure Offsets button to view a menu which displays the current zero offset
for each channel. Via the Pressure Offsets menu, zero offsets may be reset individually or collectively.
4.8.7.2 Flow measurement settings
During a test, instantaneous flow is calculated from the incremental increase in volume ∆V which is
observed over a preselected measurement time or "window" ∆T. The instantaneous flow window provides
selections of 10, 30 or 60 seconds for ∆T, with 10 seconds being the default. Higher settings of the window
reduce sensitivity of the instantaneous flow measurement to impulses and other short-term disturbances in
an infusion. A setting of 30 or 60 seconds may be preferable when testing devices such as enteral feeding
pumps, which may have a pulsatile or intermittent delivery characteristic.
Figure 50
Operation/Chapter 4
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