MTS Axial Extensometers - Manual (Page 19)

Introduction 19
Transducer Calibration
The DC conditioner and the transducer signal must be calibrated.
Calibration ensures that the transducer signal accurately represents the
gage length measure by the transducer. Calibration involves adjusting
the excitation voltage and gain of the DC conditioner to achieve the
desired transducer signal. The purpose of calibration is to equate a
specific transducer displacement to a specific voltage. When the
transducer is calibrated, it is matched to a DC conditioner. If either
component of the matched pair is changed, recalibration is required.
Axial Extensometer Overtravel Protection
When a specimen fails, the extensometer arms can be subjected to
movement beyond the rated travel. Overtravel protection is
accomplished with a pair of overtravel blocks. One block limits the
tension travel and the other limits the compressive travel to the rated
range of the extensometer.
Δ
Overtravel
Blocks
Zero Stop
Upper Arm
Lower Arm