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.
Figures B.2-1 through B.2-4 show how wire resistance affects the temperature
measurement for a Geokon 4500 Vibrating Wire Piezometer.
FIGURE B.2-1. Temperature Measurement Error at Three Temperatures as a Function of Lead Length.
Wire is 22 AWG with 16 ohms per 1000 feet.
B-2
Summary of Contents for AVW200 series
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Page 78: ...Appendix C Antennas Antenna Cables and Surge Protectors for the AVW206 AVW211 and AVW216 C 8...
Page 86: ...Appendix E Status Table E 4...
Page 104: ...Appendix H Additional Programming Examples H 12...
Page 110: ...Appendix I Using MD485 Multidrop Modems with AVW200 Interfaces I 6...
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