The data logger supplies a precise current from terminals configured for current excitation.
Return voltage is measured on U terminals configured for single-ended or differential analog
input.
U terminals can be configured as current-output terminals under program control for making
resistance measurements. For the current return, use the signal ground ( ) terminal closest to
the current source terminal. CRBasic instructions that control current excitation include:
l Resistance() - Applies an excitation current to a circuit and measures the resistance.
The maximum excitation current is ±2500 μA.
l Resistance3W() - Makes a three-wire resistance measurement. The maximum
excitation current is ±2500 μA.
Resistive Bridge Circuits with Current Excitation: (use the signal ground ( ) terminal adjacent to
the current excitation terminal)
Resistive-Bridge Type and
Circuit Diagram
CRBasic Instruction and
Fundamental Relationship
Relational Formulas
Four Wire
CRBasic Instruction:
Resistance()
Fundamental Relationship
1
:
Four Wire Full Bridge
CRBasic Instruction:
Resistance()
Fundamental Relationship
1
:
6. Measurements 73
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