Chapter 5 Using the SCXI-1125
© National Instruments Corporation 5-27 SCXI-1125 User Manual
Note You cannot mix virtual channels with the SCXI channel strings shown in the
previous section.
To create a virtual channel for the SCXI-1125, insert a new analog input
channel in the Data Neighborhood path in MAX, name it, and then follow
the software prompts to create virtual temperature channels, voltage
channels, or customized analog input channels. For more information on
virtual channels, consult the MAX online help file.
To use the virtual channels, enter the name of the virtual channel into the
analog input channel string. If using multiple virtual channels, separate
them using a comma or enter them in a different index in the channel string
array. The application does all scaling, linearization, autozeroing, and CJC
automatically.
Note Virtual analog input channels can be randomly scanned; therefore, virtual channels
can be entered in any order or repeated in the channel string.
Performing a Multiplexed Scan
To perform a multiplexed scan in your application, perform the following
steps:
1. Open an analog input example in your ADE.
2. Enter the appropriate SCXI channel string or virtual channel string into
the channels parameter.
3. Either enter the input limits for signals connected to the module to
adjust the gain settings in your system, or use the default gain settings
from the configuration utility, and then run the application. When
using virtual channels, the default input limits configured in the virtual
channel configurator are used.
You have completed a multiplexed scan using your SCXI-1125.
This is not a comprehensive discussion of SCXI scanning using LabVIEW
or Measurement Studio, but it should give you enough information to help
you get started with the examples that are shipped with these software
packages.