Campbell Scientific AVW200 AVW200-series Vibrating Wire Interfaces - Page 68

Temperature Measurement Error at Three Temperatures, B-1.

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Appendix B. Thermistor Information 4. Precision of the bridge resistors 5. Accuracy of the datalogger's voltage measurement 6. Temperature coefficient of the bridge resistors Errors three through six can probably be ignored. The wire resistance is primarily an offset error and its affect can be removed by the initial calibration. Errors caused by the change in wire resistance due to temperature and thermistor interchangeability are not removed by the initial calibration. FIGURE B-1 through FIGURE B-4 show how wire resistance affects the temperature measurement for a Geokon 4500 Vibrating Wire Piezometer. FIGURE B-1. Temperature Measurement Error at Three Temperatures as a Function of Lead Length. Wire is 22 AWG with 16 ohms per 1000 feet. B-2

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Appendix B.
Thermistor Information
4. Precision of the bridge resistors
5. Accuracy of the datalogger's voltage measurement
6. Temperature coefficient of the bridge resistors
Errors three through six can probably be ignored.
The wire resistance is
primarily an offset error and its affect can be removed by the initial calibration.
Errors caused by the change in wire resistance due to temperature and
thermistor interchangeability are not removed by the initial calibration.
FIGURE B-1 through FIGURE B-4 show how wire resistance affects the
temperature measurement for a Geokon 4500 Vibrating Wire Piezometer.
FIGURE B-1.
Temperature Measurement Error at Three Temperatures
as a Function of Lead Length.
Wire is 22 AWG with 16 ohms per
1000 feet.
B-2