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Chapter 5, FRONT PANEL OPERATION
Figure 5-37, Double Graph Menu
The double graph display is similar to that of the single graph, but displays two
curves.
If there is no data in the curve buffer then the graph will show two horizontal straight
lines representing zero. If curve storage is already running, or if there is data in the
curve buffer, then two curves will be displayed with the most recent values at the
right-hand side of the screen.
Figure 5-37 shows the layout of the double graph display. The two curves are
displayed in the central section of the display, with the keys on either side being used
to adjust the axes and to select the data to be shown, as follows:-
SCALE keys
The keys to the left-hand side of the display are used to set the upper and lower
limits of the vertical axis in 1% increments, with the top and upper-middle
keys being used for the upper curve (Curve 1) and the lower-middle and bottom
keys for the lower curve (Curve 2). Pressing both sides of one of the key pairs
simultaneously automatically sets the relevant limit to match the range present in the
visible section of the displayed curve.
As in single graph mode, there is no facility for adjusting the x-axis scale, which
always shows up to 243 points. Furthermore both the upper and lower curves are
shown over the same range of points; it is not possible, for example, to show Curve 1
for data points 1 to 243 and Curve 2 for points 243 to 486.
Curve Selection keys
The keys on the top right-hand side of the display are used to select the curve to be
shown in the upper half of the display, Curve 1, from those stored in the curve
buffer. The lower-middle right-hand keys perform an equivalent function for Curve
2, which is shown in the lower half of the display. All curves that can be stored may
be selected for display, except for EVENT, frequency, and the curve recording
instrument sensitivity settings.
START/STOP keys
In the single graph display mode, acquisition to the curve buffer, and hence display
of data, can be controlled using the Start
and Stop
keys.
5-47
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