MTS Clip-On Gages - Manual (Page 17)

Introduction 17
Clip-On Gage Functional Description
A clip-on gage (extensometer) is a sensor attached to a specimen that
measures a dimensional change (gage length or strain) that occurs in the
specimen while being tested. Clip-on gages use precision resistance-
type strain gages bonded to a metallic element to form a Wheatstone
bridge circuit. Because they are DC devices, they require a DC
conditioner for signal processing.
About DC Conditioning
The transducer requires a DC conditioner to process the transducer
signal. A DC conditioner provides a DC excitation voltage to the
transducer. Any changes to the gage length of the transducer change the
excitation signal. The changed signal is output to the DC conditioner as
feedback. The DC conditioner processes the signal and makes it
available to the controller where the signal may be used.
Typical Conditioning Circuit
About Knife Edges
Knife edges are mounted onto a specimen, or machined into a specimen.
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