Thermocouple Reading Accuracy Degrades when Configuring Extra Channel for VDC in VirtualBench-Logger 2.1.2Primary Software: Other NI Software>>VirtualBenchPrimary Software Version: 2.1 Primary Software Fixed Version: 2.7 Secondary Software: N/A
Problem: While using VirtualBench-Logger 2.1.2 to measure thermocouples on 6 channels of a system (using an SCXI-1100 and NI-DAQ 6.1.1), all of my readings are correct. Why does the the accuracy of the temperature readings seriously degrade as soon as I configure an extra channel to measure DC voltage? Solution: VirtualBench-Logger does try to use different gains for all the channels so that the readings will be more accurate. However, when using an SCXI-1100, only one gain setting can be set because the SCXI-1100 only has a single amplifier built into the hardware. Therefore, the gain settings for the hardware and software conflict during data acquisition. A better option would be to use the SCXI-1102. It has an independent amplifier on each channel and is software-configurable. More information on the SCXI-1102 is provided on the links below. Related Links: Product Catalog: NI SCXI-1102 Upgrade Advisor: VirtualBench Product Catalog: VI Logger Attachments:
Report Date: 04/09/1999 Last Updated: 07/20/2007 Document ID: 1K8H5SOL |
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