Voltage Readings With NI 9205 or NI 9206 in CompactRIO Are Off by Several MillivoltsHardware: CompactDAQ>>Analog Input Modules>>NI 9205, CompactRIO>>Analog Input Modules>>NI 9206
Problem: When using the NI 9205 or NI 9206 Analog Input module in a CompactRIO chassis, there are several millivolts of error when measuring a known voltage. Why is this happening? Solution: When these modules are used in a CompactRIO Chassis returning Calibrated(Fixed-Point) data with NI-RIO version 2.1.0 or earlier, an incorrect calibration offset value is used. This erronous offset value will cause an incorrect conversion to engineering units when applying calibration coefficients to the raw binary data and could cause an offset error of several mV in all voltage ranges Both the NI-9205 and NI-9206 modules do return correct values when Raw(binary) data is read from the module. This issue does not occur when a NI 9205 or NI 9206 are used with a CompactDAQ chassis. To correct this issue, download and install CompactRIO Module Software update 2.1.0f1 or upgrade to a more recent version of NI-RIO. Once installed, any LabVIEW FPGA VIs which include channels from the 9205 or 9206 will need to be recompiled. National Instruments always recommends to use the latest driver that your version of LabVIEW can support. Search Drivers and Updates for the newest version of NI-RIO. Related Links: National Instruments Drivers and Updates CompactRIO Module Software Version 2.1.0f1 for Real-Time OS/Windows 2000/XP KnowledgebaseB 40LATBRY: Recommended Software Updates for CompactRIO Controllers Attachments:
Report Date: 11/17/2006 Last Updated: 06/29/2009 Document ID: 43GFD8LX |
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