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Trend System
9.5 Measurement ruler
The measurement ruler is a tool that enables you to read the exact
values of the trend curve in focus. It will display the time and value for
the curve at the intersection point between the curve and the
measurement ruler at the top of the ruler.
The measurement ruler is displayed by pointing in the trend and
dragging the cursor with the left mouse button held depressed. As
soon as you start to drag the cursor it changes to a vertical ruler and
shows the value of the process variable and the correlated time in a
measurement box attached to the top of the ruler. You can move the
ruler both forwards and backwards along the horizontal time axis.
However, the updating of the trend curve on the screen is frozen while
the ruler is being displayed.
The measurement ruler only shows the trend values points, i.e. it will
not interpolate the values between the points. Thus, the ruler jumps
from point to point when dragging.
A typical Time Trend measurement ruler is shown in the following
figure.
9.6 Multiple-curve trends
It is possible to have several trend curves in the same trend provided
that they are all the same trend type. A mixture of Time and XY Trend
curves is not possible.
Each curve overlays a scale on the Y-axis of the trend and on the Xaxis for XY Trend curves. The trend presentation can be changed to
show only one scale or all scales simultaneously. Each curve and its
scale axis are given unique colours to make it easy to distinguish the
curves from each other.
Operator's Handbook, AutroOS Monitoring and Control System, 116-P-AUTROOS/FE 041124,
Autronica Fire and Security AS
Page 83