ACR Electronics SmartReader Plus Manual de usuario Pagina 91

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Graphing
80
2005 ACR Systems Inc.
6.8.11 Compound Lines
A compound line is a graph line that is made from data from one or more other graph lines. An
example would be calculating power by multiplying a measured current with a measured
voltage. In order to
Add a Compound Line
, you must first create a custom equation for a
compound line. Please refer to the
Equations
section to learn how to create a compound line
equation.
When you create a compound line equation, you specify what the output unit will be. If you
apply a compound line and then change the units, the results may be invalid. For example, if
you have a compound line equation that takes the average of 2 temperatures and outputs in
°C, it is expected that the input sources will also be in °C. If your data is shown in °C, the
results are valid but if you change the display to °F, the results will be invalid.
6.8.11.1
Add A Compound Line
The compound line equation must already be defined and the sources of data will be either
channels in the graph or constant values. The compound line will be added to the data table
and the statistics as well as being displayed on the graph. It is recommended that you create
the compound line when the entire graph is displayed, otherwise the compound line will only
apply to the data in the zoomed area. Note that if your graph has data from multiple files that
are separated in time, the compound line will not be drawn across the gap.
1.
Select the Compound Lines Menu and then select
Add Compound Line
. This will pop
up an input form.
2.
Select an Equation from the drop-down list.
3.
Enter a Description for the compound line to appear in the Legend box
4.
Select the Sources of Data for the Equation Variables. You can enter a numerical value
or select a graph channel from the drop-down list. All the sources must be entered.
5.
Click
OK
.
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