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Chapter 5, FRONT PANEL OPERATION
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.
CURSOR keys
The bottom right-hand
keys and the
and
cursor-movement keys move
the displayed cursor, which is only active when data is not being stored, from side to
side. The present point number is shown in the bottom right-hand corner of the
screen and the value of the curve at its intersection with the cursor appears in the top
right-hand corner. Where applicable, values are given as 100 x percentage of full-
scale (e.g. a value of 5000 represents 50% f.s.), since there is no facility to display
them in floating-point format. If the cursor is moved fully to the left then the
displayed data scrolls to the right in groups of ten points, allowing earlier data to be
shown.
If acquisition is in progress then the cursor is automatically positioned at the right-
hand side of the display area and cannot be moved.
Pressing the Previous Menu key on the front panel exits the Single Graph menu and
returns to Main Menu 2.
5.3.29 Double Graph Menu
When Main Menu 2 is displayed, pressing a key adjacent to the Double Graph item
accesses the Double Graph menu, which is shown in figure 5-37.
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:-
5-47
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