Sensor Type Connection Example
4-wire transmitter using datalogger power
4-wire transmitter using external power
6.3 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
datalogger supplies a precise voltage excitation via VX terminals. Return voltage is measured on
analogue 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 measurements specifications (p. 168).
6.3.1 Resistance measurements with voltage excitation
CRBasic instructions for measuring resistance with voltage excitation include:
l BrHalf() - half bridge
l BrHalf3W() - three-wire half bridge
l BrHalf4W() - four-wire half bridge
l BrFull() - four-wire full bridge
l BrFull6W() - six-wire full bridge
6. Measurements 63
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