Campbell Scientific AVW200-series Vibrating Wire Interfaces User Manual
Page 68
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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- 020C Wind Direction Sensor (26 pages)
- 024A-L Met One Wind Direction Sensor (30 pages)
- 03001-L R.M. Young Wind Sentry Set (34 pages)
- 03002, 03101, and 03301 R. M. Young Wind Sentry Sensors (40 pages)
- 034A-L WindSet (16 pages)
- 034B-L Met One Windset (34 pages)
- 036, 038 Spark Gapped Junction Box (6 pages)
- 05103, 05103-45, 05106, and 05305 R. M. Young Wind Monitors (30 pages)
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- 107-L Temperature Probe (28 pages)
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- 108-L Temperature Probe (30 pages)
- 109-L Temperature Probe (30 pages)
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