TREND 963 User Guide - Manual (Page 43)

Using 963
963 User Guide TC200635 Issue 3 25/03/2008 43
3.5.2 Display a Precision Graph
Precision graphs allow for great accuracy but a reduced range of values and the transfer rate is much slower.
Precision graphs should be used for meter readings as there is no loss of raw data.
To display a precision 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, right-click the value that is to be graphed and click
Collect full precision log graph(s).
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, right-click one of the
values and click Collect full precision log graph(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. 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 points of 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.