TREND 963 User Guide - Manual (Page 47)

Using 963
963 User Guide TC200635 Issue 3 25/03/2008 47
3.5.7.1.3 Change a Trace's Logging Interval
If a sensor is being logged at different intervals in the IQ controller it is possible to specify which one of the logs is
used for the graph.
To change a trace's logging interval:
1. On the Traces menu click Edit Trace. The Traces dialogue box is displayed.
2. Click the trace for which the logging interval is to be changed.
3. Click OK. The Choose Logging Interval dialogue box is displayed.
4. Click the required logging interval.
Note that only the intervals at which the value is logged in the controller will be available for selection
5. Click OK.
3.5.7.2 Display a Grid on a Graph
963 can display a vertical and/or horizontal grid on any graph. When a horizontal grid is selected, the grid can be
based on either the left, or right hand axis.
To display a horizontal grid:
1. Display either a compact graph, or a precision graph as described in the appropriate section of this manual.
2. On the Graph menu point to Grid, and click Left or Right, depending which axis is to be used for the grid.
To display a vertical grid:
1. Display either a compact graph, or a precision graph as described in the appropriate section of this manual.
2. On the Graph menu point to Grid, and click X-Grid.
3.5.7.3 Fix the Scaling of the Y Axis
The scaling of the Y-axes can be fixed enabling easy comparison of graphs. When the scale of an axis is fixed if a
value is outside the current range the axis will not be adjusted to plot the value.
To fix the scaling of the Y axis:
1. Display either a compact graph, or a precision graph as described in the appropriate section of this manual.
2. On the Graph menu click either Fix left scale or Fix right scale, depending for which axis the scaling is to
be fixed. The Config dialogue box is displayed.
3. Enter the maximum value for the axis in the text box.
4. Click the Y min tab.
5. In the box enter the minimum value for the axis.
6. Click OK.
To return the axis to automatic scaling, set the Y max value to -9999.