MTS Model 632-85 Biaxial Extensometer - Manual (Page 5)

Model 632.85 Biaxial Extensometer Introduction 5
Introduction
The Model 632.85 Biaxial Extensometer provides axial and transverse outputs
from a single extensometer. The biaxial extensometer is typically used when
performing Poisson ratio testing, composites testing and metal formability
testing.
The extensometer consists of three sensor units. Each sensor unit uses precision
resistance-type, foil strain gages bonded to a metallic element to form a
Wheatstone bridge circuit. Each axial sensor unit uses either a half or full
Wheatstone bridge (depending upon the option selected) to measure axial
deflection. The transverse sensor unit uses a full Wheatstone bridge to measure
the transverse deflection.