MTS Material Test Systems - Manual (Page 65)

Note:
If possible, install a dummy specimen at this time. Use of a dummy specimen will help avoid potential
damage to the test specimen when establishing the servo loop response and stability. The dummy
specimen should be a representative model of the test specimen.
Warning:
Specimen installation is a hazardous procedure because of the proximity of the operator to
force train components with hydraulic pressure applied.
Personal injury or equipment damage can result if the operation of the analog controls and
load frame are not completely understood.
Use extreme caution while working near the load frame with hydraulic pressure on. Before
working near the load frame, ensure that all personnel involved in the specimen installation
and operation read the Safety section of this manual and the warnings and cautions in the
load frame product manual. Secure specimen to upper the grip or fixture .
Install the specimen into the upper fixture/grip assembly. This action differs depending on the grip or
fixture. Refer to the appropriate product manual for additional information.
Warning:
When installing a specimen in load control, the actuator piston will continue to move until the
specified load is achieved.
Use of large load levels during specimen installation can result in equipment damage or
personal injury.
Use the smallest load level possible when installing a specimen in load control.
6. Extend actuator rod and secure specimen in the lower grip or fixture.
Use the Set Point control to move the actuator rod.
Install the specimen into the lower grip or fixture assembly. This action differs depending on the grip or
fixture. Refer to the appropriate product manual for additional information.
7. If desired, zero the force transducer output .
8. If desired, zero the displacement transducer output .
7.6.0 Adjust Load Servo Loop
If a test is to be run in load control, adjust the load control mode Gain (P), Rate (D), and Reset (I) controls.
Complete the following steps to adjust the servo loop controls for the force (load) control mode.
MTS Material Test System Operation 65
7.0 Operation