TREND 963 User Guide - Manual (Page 42)

Using 963
963 User Guide TC200635 Issue 3 25/03/2008 42
3.5 Display Graphs
3.5.1 Display a Compact Graph
Compact graphs allow for rapid transmission of data and for very large numbers, but have an error of 1%.
To display a compact graph:
1. Display the schematic page containing the value for which logged data is to be graphed as described in the
‘Display a Schematic Page’ section of this manual, and click the value that is to be graphed.
Or
View the values that are to be graphed in the Device Viewer as described in the ‘Display the IQ System’
section of this manual, click the value(s) that are to be graphed. To select more than one, hold down the
CTRL key, and click the required values, or drag the mouse over the required values, and right-click one of
the values and click Graph Point(s).
Note that it is not possible to graph values from BACnet devices.
The graph is displayed. Clicking OK will close the graph. To view the time and the value click a point on
the graph. To display a vertical bar that can be dragged along the graph displaying the values click Show
Values on the Graph menu. If the sensor is being logged in the controller at more than one interval it is
possible to specify which log is used. You can zoom in and out of the graph to make it easier to see the
data, a grid can be displayed, and the scaling of the Y-axis can be fixed to allow graph traces to be
compared. The Y-axis can be swapped, this means that values with similar units or range can be set to use
the same Y-axis. If graph definitions have been set up they can be loaded when needed, or the existing
graph definition can be saved as a graph definition. A graph can be printed, or the data for a particular trace
displayed as a list of points. Recorded graphs can be playedback or graph recording can be specified. The
graph can be recorded to the 963’s database for playback later, or can be recorded to a text file for use in
other applications.
For more accurate values it is possible to display a full precision log by clicking Use Precision log collection on the
Precision logs menu. Note that it is not possible to return to a compact graph.