Why Do I Receive Drift Readings when Using Analog Input on My DAQ Device? Primary Software: LabVIEW Development Systems>>Full Development SystemPrimary Software Version: 1.0 Primary Software Fixed Version: N/A Secondary Software: Hardware: Multifunction DAQ (MIO)>>Portable>>USB-6251
Problem: When I feed a voltage source through an analog input channel on my DAQ device, I see the voltage drift. Why is this happening when I am feeding the device a constant signal? Solution: You may be unintentionally measuring the voltage in Differential mode. Switching the mode of the device from Differential to RSE may resolve this issue. If you are using LabVIEW, RSE is an option for the input terminal configuration input of the DAQmx Create Channel VI. If you are programming in C, you can change this setting in the DAQmxCreateAIVoltageChan function by setting the terminalConfig parameter to DAQmx_Val_RSE. See the attached JPEG on how to set a device up in RSE mode using NI-DAQmx VIs. Related Links: Attachments:  RSE Configuration.JPG
Report Date: 06/05/2007 Last Updated: 06/07/2007 Document ID: 4A4585Y5 |
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