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Chapter 5 Using the SCXI-1141/1142/1143 Module
© National Instruments Corporation 5-7 SCXI-1141/1142/1143 User Manual
Note This is not a complete list of NI-DAQmx properties and does not include every
property you may need to configure your application. It is a representative sample of
important properties to configure for voltage measurements. For a complete list of
NI-DAQmx properties and more information about NI-DAQmx properties, refer to your
ADE help file.
Acquiring, Analyzing, and Presenting
After configuring the task and channels, you can start the acquisition, read
measurements, analyze the data returned, and display it according to the
needs of your application. Typical methods of analysis include digital
filtering, averaging data, performing harmonic analysis, applying a custom
scale, or adjusting measurements mathematically.
NI provides powerful analysis toolsets for each NI ADE to help you
perform advanced analysis on the data without requiring you to have a
programming background. After you acquire the data and perform any
required analysis, it is useful to display the data in a graphical form or log
it to a file. NI ADEs provide easy-to-use tools for graphical display, such as
charts, graphs, slide controls, and gauge indicators. NI ADEs have tools
that allow you to easily save the data to files such as spread sheets for easy
viewing, ASCII files for universality, or binary files for smaller file sizes.
Completing the Application
After you have completed the measurement, analysis, and presentation of
the data, it is important to stop and clear the task. This releases any memory
used by the task and frees up the DAQ hardware for use in another task.
Note In LabVIEW, tasks are automatically cleared.
Developing an Application Using LabVIEW
This section describes in more detail the steps shown in the typical program
flowchart in Figure 5-1, such as how to create a task in LabVIEW and
configure the channels of the SCXI-1141/1142/1143. If you need more
information or for further instructions, select Help»VI, Function, &
How-To Help from the LabVIEW menu bar.
Note Except where otherwise stated, the VIs in Table 5-6 are located on the Functions»
All Functions»NI Measurements»DAQmx - Data Acquisition subpalette and
accompanying subpalettes in LabVIEW.