MTS Axial Extensometers - Manual (Page 51)

Installation 51
Installation
This section describes how to mount the extensometer to a specimen
and zero the extensometer output.
Contents
How to Mount an Extensometer 52
About Quick Attachment Springs 53
About Metal Extension Springs 57
About Elastic Bands 60
Handling the extensometer while it is selected as the active control
mode can cause the actuator to move unpredictably.
Unpredictable actuator movement can cause personnel injury or
damage to the test equipment.
Ensure that the extensometer is not active when installing it to a
specimen.
The shield of the Extensometer (pin E for PT style connector and pin A
for Amphenol style connector) must be connected to the controllers
chassis ground. This is typically accomplished by using a metal or
metalized plastic connector and a braided shielded cable from the
controller to the Extensometer cable, see MTS cable part numbers 50-
120-0xx PT style or 56-233-6xx Amphenol style for an example.
Zero Extensometer Output
The purpose of zeroing the extensometer output is to identify the
starting position of the extensometer to the system controller. An
extensometer usually needs to be zeroed (at least checked) after it has
been installed.
For example, suppose the extensometer is installed and is a bit off from
its calibrated zero position. The controller can be programmed to accept
the current output from the extensometer as the zero output.
WARNING