Instructions
UM-0085-B09 DT80 Range User Manual Page 154
RG
Trend Chart Mimics
About Charts
The trend chart mimic is the most sophisticated of the mimic types. It can retrieve historical data from the DT80 and plot
one or more channels on a "chart recorder" type display.
Figure 47: Trend chart mimic
Up to 5 different channels can be plotted on each chart mimic, and up to two Y axes can be defined.
The above screenshot shows a typical chart mimic shortly after the job was started. The chart has been configured to
show the last 20 minutes worth of data, and the job has been running for about 12 minutes. The blue trace (temperature)
uses the left hand axis, while the red trace (sine wave) uses the right hand axis.
The Y axis range can either be set manually (as is the case here) or automatically. Moving the cursor over a trace will
display details of an individual sample point, as shown in the screenshot, while moving the cursor over the green area on
the left will display a legend showing the channel name for each trace colour.
Each trace stores and displays up to 1000 data points, which may be fewer than the actual number of data points logged
over the displayed time interval. If this is the case then the trend chart will actually show a sample
of the actual logged
data. Be aware that this sampling of the data may cause narrow peaks in the data to be missed, and not displayed.
Defining a Chart
Defining a chart is similar to defining any other mimic. Click the Add a mimic... button on any unused mimic space,
which will bring up the mimic creation dialog (Figure 45). Select Chart, and the chart mimic creation dialog (Figure 48)
will be displayed.
Figure 48: Trend chart mimic creation screen
To define the chart:
• Select the schedule containing the channel(s) to chart. Note that all channels plotted on a single chart must be
part of the same schedule
• Select a channel from the Available list and press the > button to move it to the Selected list. Repeat for any
further channels that you wish to show on the chart
• Use the slider control to select the time window covered by the chart, e.g. selecting "2 hours" will plot data for
the last two hours