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9 P/V tool maneuver option
9.2.2 Using the cursor feature to graphically analyze
the plot
NOTE:
The cursor selects two points simultaneously: one on the
inflation limb and one on the deflation limb.
You can use the P/V Tool cursors to determine numeric values
for points on the curve. Using both cursors, you can also per-
form a “visual curve fitting” to determine the linear compli-
ance, which is then displayed.
Regardless of the type of curves, the cursor remains available
and adjustable. The actual value at cursor positions is displayed
as temporary information on the screen.
To determine the numeric value at a point on the curve, turn
the P&T knob. You can read the values at the bottom of the
window (Figure 9-5).
P/V Tool Pro:
LIP, UIP and PDR are automatically calculated during the PV
maneuver. After calculation each reading is displayed as
numerical values and the cursor will automatically jump to LIP
and PDR.
To perform a “visual curve fitting” to determine the com-
pliance, complete these instructions:
1. Select
Cursor 1
; then select a point on the curve where
you suspect the low inflection point is located (Figure 9-5
and Figure 9-5). Deselect
Cursor 1
.
2. Select
Cursor 2
; then find a point on the curve where
you suspect the upper inflection point is located. Deselect
Cursor 2
.
3. Two straight lines (linear compliance) are automatically
drawn, each connecting the cursors on the inflation or
deflation limb. Adjust the cursors for the “best visual fit”.
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