MTS Material Test Systems - Manual (Page 49)

through the system interlock. Likewise, if the feedback falls below the preset lower limit detect level, the limit
detector will (if enabled during test setup) stop the test through the system interlock.
Table 7: Upper and lower limit detector levels
Description Item
Full-scale operating range 1
Upper limit detect level 2
Upper limit detected 3
Lower limit detect level 4
Lower limit detected 5
The limit detectors should be set to minimize the chances of accidental damage to test specimens and test
equipment. They are typically set to shut down the test system upon specimen failure in order to prevent
fixturing or equipment damage. Under no circumstances should the limit detectors be relied on to protect
personnel.
In order to calculate the upper and lower limit detector levels, the maximum and minimum test forces or
displacements must be known. However, in some cases, the upper and lower limits cannot be determined
before testing. The following paragraphs describe how to determine limits in both of these situations.
MTS Material Test System Operation 49
6.0 Getting Started