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Strain gage measurements
You can measure a strain gage using a 4-wire resistance measurement with scaling.
When a force is applied to a body, the body deforms. The deformation per unit length is called strain (ε). Strain may
be either tensile (+) or compressive (-). Practical strain values are usually quite small (typically less than 0.005
inch/inch for most metals) and are often expressed in micro-strains (με). There are three common types of strain
measurements as shown below:
1. Normal strain (ε)
It is a measure of the deformation along the axis of the applied force, where ε=ΔL/L
2. Shearing strain (γ)
It is is a measure of the angular distortion of a body. It is approximated by the tangent of the angle formed by the
angular change between two line segments that were parallel in the undeformed state.
3. Poisson Strain (υ)
It measures a property of materials known as the Poisson Ratio. It is the negative ratio of transverse and lon-
gitudinal normal strain when a body has a longitudinal tensile force applied, where υ = - εt/ε, where εt = ΔD/D
and ε = ΔL/L
Keysight DAQ970A/DAQ973A User's Guide
4 Measurement Tutorials
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