MTS Material Test Systems - Manual (Page 44)

6.1.0 Overview
Before setting up or operating the test system, the hardware component configuration must be defined, control
settings (or test parameters) should be calculated, and test setup decisions must be made. This section
describes some of the factors to consider when completing these pre-operation procedures.
Define the test configuration
Identifies factors to consider when selecting the hardware for a test. It also describes test controller features
that can be selected for specific test applications. All of these selections must be made before power is applied
to the test system.
Define the test parameters
The test definition contains separate definition items for a test procedure, runtime displays, report layouts,
test variables, and test resources. These test parameters should be defined before beginning the operating
procedure.
Select test setup methods
Describes the effect of the servo loop adjustments. This information should be reviewed and any necessary
setup decisions should be made before beginning the operating procedure.
Determine the crosshead position
Describes how to determine the position of the crosshead to achieve the clearance needed for specimen
installation.
6.2.0 Define the Test Configuration
Test configuration definition involves determining how the mechanical components will be set up, what external
equipment is necessary, and how the test controller features should be configured. The following subsections
outline some of the factors to consider when defining the test configuration.
6.2.1.0 Load Unit Setup
Select a load cell that is properly rated for the test. Then, ensure that the load cell is aligned with the actuator.
The load cell must also be aligned whenever the actuator or crosshead is reinstalled.
Determine what types of grips/fixtures will be used to secure the specimen into the load frame's force train.
Consider how the load cell, specimen, and grips/fixtures are to be lifted and moved during test set up. Suitable
lifting devices and supporting fixtures should be obtained and available for use.
To ensure accurate test response and stability, grips/fixtures must be stiffer than the specimen. The type of
grips/fixtures also affect the determination of the crosshead height. The length of the grips/fixtures must allow
the actuator to be at midstroke after the specimen is installed.
44 MTS Material Test System Operation
6.0 Getting Started