Campbell Scientific CR3000 Micrologger - Manual (Page 38)

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