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Chapter 5 Using the SCXI-1503
© National Instruments Corporation 5-13 SCXI-1503 User Manual
Programmable NI-DAQmx Properties
All of the different ADEs that configure the SCXI-1503 access an
underlying set of NI-DAQmx properties. Tables 5-1 through 5-4 provide a
list of some of the properties that configure the SCXI-1503. You can use
this list to determine what kind of properties you need to set to configure
the device for your application. For a complete list of NI-DAQmx
properties, refer to your ADE help file.
Note Tables 5-1 through 5-4 are not complete lists of NI-DAQmx properties and do not
include every property you may need to configure voltage measurements. It is a
representative sample of important properties to configure voltage measurements. For a
complete list of NI-DAQmx properties and more information on NI-DAQmx properties,
refer to your ADE help file.
Calibration
The SCXI-1503 is shipped with a calibration certificate and is calibrated at
the factory to the specifications described in Appendix A, Specifications.
Calibration constants are stored inside the calibration EEPROM and
provide software correction values your application development software
uses to correct the measurements for both offset and gain errors in the
module.
Internal/Self-Calibration
You can self-calibrate the SCXI-1503 in MAX by right-clicking the
module and selecting Self Calibrate. The NI-DAQmx Self Calibrate Device
function does the same. A self-calibration of the SCXI-1503 grounds all the
input channels and stores the resulting measurement as an offset correction
constant on the module. You should perform a self-calibration every time
you install the SCXI-1503 to a new system.
Note You should self-calibrate the connected DAQ device before self-calibrating the
SCXI-1503.
External Calibration
If you have an accurate calibrator and DMM, you can externally calibrate
the SCXI-1503 gain and offset constants using NI-DAQmx functions. You
can also calibrate the 100 μA current excitation.