Setting the Auto Zero Mode of an SCXI Module in Traditional DAQHardware: SCXI>>Modules
Problem: I am trying to set the auto zero mode of my SCXI module in Measurement and Automation Explorer, but cannot find this setting. I am able to find the setting for my global channel in MAX when using DAQmx, but how do I set this up when using Traditional DAQ? Solution: Auto Zero Mode is a procedure for eliminating offsets generated by an amplifier stage. In Auto Zero Mode, NI-DAQ shorts the input channel to ground and subtracts the obtained measurement from all subsequent samples. It is basically a quick calibration technique that takes place at the beginning of a scan. Auto Zero Mode can be configured very easily in MAX when using DAQmx. To do this, you simply create a Global Channel that is reading the desired physical channel on your SCXI module. Once the Global Channel has been created, you can set the Auto Zero Mode by highlighting your channel under My System>>Data Neighborhood>>NI-DAQmx Global Channels in MAX (as shown below). The Device tab can then found between the Settings and Calibration tabs in the window on the right. This is where the Auto Zero Mode can be set. To establish the same setting when programming in Traditional DAQ, AI Parameter.vi has to be called from LabVIEW. This VI can be found by navigating to All Functions>>NI Measurements>>Data Acquisition>>Analog Input>>Advanced Analog Input from the functions palette. After placing this VI, create constants for the operation and parameter name inputs and make their values to set and Autozero (12) respectively. This is shown in the code attached below. Related Links: Attachments: 
Report Date: 08/08/2005 Last Updated: 08/11/2005 Document ID: 3O7IHTCC |
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