How do I configure the Input Range of the NI 9237? Hardware: CompactRIO>>Analog Input Modules>>NI 9237
Problem: The NI 9237 has an input range of 25 mV for every volt of excitation. Since this device can provide a maximum excitation voltage of 10 volts, I expect that a maximum input range of 250 mV. If I configure a task with an input range of more than 25 mV, I get error -200077: "Requested value is not a supported value for this property." Solution: As described in this knowledge base article, the NI 9237 is designed specifically for measuring signals that are proportional to their excitation signal. The hardware is built to measure mV/V directly rather than making a conversion. Since the signal is compared to the excitation before it reaches the analog to digital converter, the range of the task should be divided by the excitation voltage level. In this way, the voltage range is actually independent of the excitation level. The maximum range for a custom voltage task with an NI-9237 is 25 mV/V, regardless of the excitation level chosen. Related Links: AE KB 47EAGLIH: Incorrect readings on the NI 9237 NI 9237 Operating Instructions Attachments:
Report Date: 01/22/2008 Last Updated: 01/28/2008 Document ID: 4HLD27Q9 |
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