Campbell Met One 034A-L Manuel d'instructions télécharger pdf (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

= R

+ R

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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Campbell Met One 034A-L Manuel d'instructions Page 31