MTS Axial Extensometers - Manual (Page 20)

Introduction 20
Extensometer Zero Reference
There are three zero reference methods used by MTS’s extensometers:
zero pin, zero stop, and fixture. The zero reference position is important
when calibrating the extensometer output signal or when mounting an
extensometer to a specimen.
Zero pin
Some extensometers includes a zero pin that can be inserted into a zero
reference hole. This locks the extensometer arms in the zero reference
position. This is useful for specimen installation.
Zero stop
Some extensometers include a zero stop block built into the arms of the
extensometer. A zero stop block works like overtravel blocks. When
installing a specimen, pinch the two arms of the extensometer together.
This stops the extensometer’s arms in the zero position.
Fixture
Some extensometers require special fixtures that set the arms of the
extensometer into the proper zero reference positon.
Axial Extensometer Accessories
Note Not all accessories are available for all extensometers. Check
with MTS Systems Corporation for a list of possible accessories
for your extensometer.
Accessories available for the axial extensometers include the following:
• Gage length extenders increase the gage length of the extensometer
without changing its travel. An extension bracket is mounted to one
arm of an extensometer to increase the gage length.
• Gage length de-extenders decrease the gage length of the
extensometer without changing its travel. De-extender hardware is
mounted to both arms of an extensometer to decrease the gage
length.
• Cable connectors from the extensometer can be an Amphenol or a
PT connector.
• A Model 650.03 Extensometer Calibrator can help with the local
calibration of any extensometer.