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Appendix B. Wind Direction

Measurement Theory

It is not necessary to understand the concepts in this section for the general

operation of the 034B Windset with Campbell Scientific’s datalogger.

The 034B Windsets purchased from Campbell Scientific have 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 k resistor equals the

resistance of the potentiometer (R

= R

+ R

R = 9.53K OHM

ADJUSTABLE RESISTANCE

TO BALANCE POTENTIOMETER

1K OHM

10K OHM

POTENTIOMETER

AG or

FIGURE B-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.

B-1

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