National Instruments Module SCXI-1503 User Manual

Also see for Module SCXI-1503: CALIBRATION PROCEDURE

Contents

National Instruments Module SCXI-1503 User Manual Manual pdf 56 page image

Chapter 5 Using the SCXI-1503© National Instruments Corporation 5-13 SCXI-1503 User ManualProgrammable NI-DAQmx PropertiesAll of the different ADEs that configure the SCXI-1503 access anunderlying set of NI-DAQmx properties. Tables 5-1 through 5-4 provide alist of some of the properties that configure the SCXI-1503. You can usethis list to determine what kind of properties you need to set to configurethe device for your application. For a complete list of NI-DAQmxproperties, refer to your ADE help file.Note Tables 5-1 through 5-4 are not complete lists of NI-DAQmx properties and do notinclude every property you may need to configure voltage measurements. It is arepresentative sample of important properties to configure voltage measurements. For acomplete list of NI-DAQmx properties and more information on NI-DAQmx properties,refer to your ADE help file.CalibrationThe SCXI-1503 is shipped with a calibration certificate and is calibrated atthe factory to the specifications described in Appendix A, Specifications.Calibration constants are stored inside the calibration EEPROM andprovide software correction values your application development softwareuses to correct the measurements for both offset and gain errors in themodule.Internal/Self-CalibrationYou can self-calibrate the SCXI-1503 in MAX by right-clicking themodule and selecting Self Calibrate. The NI-DAQmx Self Calibrate Devicefunction does the same. A self-calibration of the SCXI-1503 grounds all theinput channels and stores the resulting measurement as an offset correctionconstant on the module. You should perform a self-calibration every timeyou install the SCXI-1503 to a new system.Note You should self-calibrate the connected DAQ device before self-calibrating theSCXI-1503.External CalibrationIf you have an accurate calibrator and DMM, you can externally calibratethe SCXI-1503 gain and offset constants using NI-DAQmx functions. Youcan also calibrate the 100 μA current excitation.