Actual Excitation Voltage of NI 9237 Differs from Specified Voltage Primary Software: Driver Software>>NI-DAQmxPrimary Software Version: 8.3 Primary Software Fixed Version: N/A Secondary Software: N/A Hardware: CompactRIO>>Analog Input Modules>>NI 9237
Problem: When creating a DAQmx Task for Strain or Custom Voltage with Excitation with the NI 9237, the excitation voltage that I specified in the task is not the same as I measure across Ex+ and Ex-. For example, when I created my task, I specified an excitation voltage of 6V. However, when I read the actual voltage being output across Ex+ to Ex- I see that the output is only 5 V. Why does the actual voltage differ from the voltage I specify? Solution: The NI 9237 can supply only 2.5 V, 3.3 V, 5 V, or 10 V of excitation voltage. When you specify an excitation voltage other than the available excitation values, the excitation voltage adjusts to the nearest available excitation level. Related Links: Product Manual: NI 9237 Operating Instructions and Specifications Developer Zone Tutorial: Measuring Strain with Strain Gauges Attachments:
Report Date: 08/25/2006 Last Updated: 07/28/2007 Document ID: 40OADS46 |
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