Voltage Readings With NI-9205 or NI-9206 in CompactRIO Are Off by Several Millivolts Hardware: CompactRIO>>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: Both the NI-9205 and NI-9206 modules do return correct binary values, however, the CompactRIO Module Software version 2.1.0 or earlier return an incorrect calibration offset value when used with the NI 9205 Module or the NI 9206 Module in a CompactRIO chassis. The returned 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. 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 version 2.1.0f1 or later. CompactRIO Module Software 2.1.0f1 is an update to NI-RIO 2.1. Once installed, any LV FPGA VIs which include channels from the 9205 or 9206 will need to be recompiled. Compact RIO Module Software Version 2.1.0f1 is linked below. It can also be found by going to www.ni.com/downloads and downloading the current CompactRIO Module Software version from Drivers and Updates. This fix has been included in NI-RIO 2.1.1 or later. Related Links: National Instruments Download Center CompactRIO Module Software Version 2.1.0f1 for Real-Time OS/Windows 2000/XP KB 40LATBRY: Recommended Software Updates for CompactRIO Controllers Attachments:
Report Date: 11/17/2006 Last Updated: 11/13/2008 Document ID: 43GFD8LX |
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