Resistive-Bridge Type and
Circuit Diagram
CRBasic Instruction and
Fundamental Relationship
Relational Formulas
Four Wire Half Bridge
1,2
CRBasic Instruction:
BrHalf4W()
Fundamental Relationship:
Full Bridge
1,2
CRBasic Instruction:
BrFull()
Fundamental Relationship:
These relationships apply to
BrFull()
and BrFull6W()
Six Wire Full Bridge
1
CRBasic Instruction:
BrFull6W()
Fundamental Relationship:
1
Key: V
x
= excitation voltage; V
1
, V
2
= sensor return voltages; R
f
= fixed, bridge or completion resistor; R
s
=
variable or sensing resistor.
2
Campbell Scientific offers terminal input modules to facilitate this measurement.
Offset voltage compensation applies to bridge measurements. In addition to RevDiff and
MeasOff parameters discussed in Minimizing offset voltages (p. 156), CRBasic bridge
6. Measurements 71
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