Appendix d. wind direction measurement theory, Appendix d – Campbell Scientific 034B-L Met One Windset User Manual
Page 31
Appendix D. Wind Direction
Measurement Theory
It is not necessary to understand the concepts in this section for the general
operation of the 034B, Wind Set with a Campbell Scientific datalogger.
A 034B purchased from Campbell Scientific has a 9.53 kΩ fixed resistor and a
variable resistor on the excitation line. The variable resistor is adjusted by the
manufacturer so its resistance plus the 9.53 kΩ resistor equals the resistance of
the potentiometer (R
f
= R
s
+ R
t
).
FIGURE D-1. 034B potentiometer in a half bridge circuit
The vanes are calibrated due south and then the potentiometer is adjusted until
each half of the potentiometer has equal resistance.
D-1
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