Resistance Measurements; Resistance Measurements With Voltage Excitation - Campbell CR300 Series Product Manual

Sensor type
4-wire transmitter using data logger power
4-wire transmitter using external power

18.3 Resistance measurements

Bridge resistance is determined by measuring the difference between a known voltage applied to
the excitation (input) of a resistor bridge and the voltage measured on the output arm. The data
logger supplies a precise voltage excitation via VX terminals. Return voltage is measured on
analog input terminals configured for single-ended (SE) or differential (DIFF) input. The result of
the measurement is a ratio of measured voltages.
See also Resistance measurement

18.3.1 Resistance measurements with voltage excitation

CRBasic instructions for measuring resistance with voltage excitation include:
BrHalf()
- half bridge
l
BrHalf3W()
l
BrHalf4W()
l
specifications (p. 245).
- three-wire half bridge
- four-wire half bridge
Connection example
18. Measurements 95