Campbell-scientific CR3000 Micrologger Manuale Utente Pagina 38

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Section 4. Quickstart Tutorial
38
A specific resistance in a pressure transducer strain gage correlates to a
specific water pressure.
A change in resistance in a wind vane potentiometer correlates to a change in
wind direction.
4.1.3.2.1 Voltage Excitation
Bridge resistance is determined by measuring the difference between a known
voltage applied to a bridge and the measured return voltage. The CR3000
supplies a precise scalable voltage excitation via excitation terminals. Return
voltage is measured on analog terminals. Examples of bridge sensor wiring using
voltage excitation are illustrated in figures Half-Bridge Wiring -- Wind Vane
Potentiometer
(p. 38) and Full-Bridge Wiring -- Pressure Transducer (p. 38).
Figure 5: Half-bridge wiring -- wind vane potentiometer
Figure 6: Full-bridge wiring -- pressure transducer
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