Does the FP-SG-140 Support Offset Nulling and Shunt Calibration?Hardware: FieldPoint>>Analog I/O Modules>>FP-SG-140
Problem: I would like to perform an offset null and shunt calibration operations on my strain gage sensor using the FP-SG-140 module. Is this possible? Solution: The FP-SG-140 does not support offset nulling and shunt calibration at the hardware level. However, you can do both a null correction and shunt calibration in your application software. In order to perform a null correction in software, you simply take a measurement with your strain gage sensor at rest and then subtract the value that you measure from all measurements that follow. In order to perform a shunt calibration on a strain gage channel, you must introduce a shunt resistor into your strain gauge circuit. You must calculate the effect the shunt resistor will have on your measurement. If the measurement is lower or higher than expected, you can multiply your signal by a percentage that will correct the error. The overall equation that you would use in software would include your offset correction and your gain correction from your shunt calibration. Therefore, your overall calibrated equation would be linear: y = mx + b Where your gain correction percentage is m and your offset correction is b. The original measurement is represented by x and the calibrated value is represented by y. Related Links: Product Manuals: FP-SG-140 and cFP-SG-140 Operating Instructions Attachments:
Report Date: 03/17/2004 Last Updated: 03/22/2004 Document ID: 37GCKKMV |
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