Chapter 5
Using the SCXI-1521/B
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Perform Shunt Calibration
Shunt calibration is a process used to obtain a gain adjust factor, which
corrects for system gain error. You can use a strain task or global channel
to perform shunt calibration. The shunt calibration is performed during the
configuration of the global channel(s). Refer to the
section of Chapter 3,
information about shunt calibration in MAX.
To manually perform shunt calibration, refer to the
section of Chapter 4,
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.
Some custom scaling applications require the actual excitation voltage
applied to the bridge instead of the nominal excitation voltage output by the
SCXI-1521/B.
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.
