MTS Landmark System - Manual (Page 102)

Using a tool that keeps your hands clear of the actuator, grasp the specimen half in the upper grip and
release the grip. Repeat the procedure for the lower grip. That completes the Example HCF Force Test.
Recover from a Tripped Limit
Recovering from a tripped limit may consist of one of the following steps:
a) If Necessary, Recover from a Tripped Force Limit (p. 102)
b) If Necessary, Recover from a Tripped Displacement Limit (p. 105)
If Necessary, Recover from a Tripped Force Limit
There are a number of possible causes for a tripped force limit. For example:
• Clamping a grip may result in a force spike higher than expected.
• Your test limits may not have been set high enough.
• The specimen may break, resulting in the end of the test.
Rather than cover all possibilities, this section addresses the first case above only. Adapt this procedure
as necessary to recover from other cases.
1. Evaluate if the specimen has been damaged.
a) Check meter history to see if acceptable force limits for the specimen have been exceeded.
b) If they have, switch back to displacement control, safely remove the specimen from the lower grip,
and start over with a new specimen.
c) If the specimen was not damaged, proceed to the next step.
2. Disable the Force Lower Limit.
102 | MTS Landmark Test System Operation
Running the Example HCF Test