MTS Material Test Systems - Manual (Page 51)

Table 8: Underpeak Detector Levels
Description Item
Full-scale operating range 1
Maximum underpeak detect level 2
Maximum underpeak detected 3
Minimum underpeak detect level 4
Minimum underpeak detected 5
The underpeak detector is typically set to stop a test before specimen failure. This minimizes the chance of
equipment damage that may result if the specimen fractures.
The following examples presume that the input to the underpeak detector is the DC controller's load transducer
feedback signal.
Determining underpeak levels from known test forces or displacements
To calculate the underpeak detector levels, the maximum and minimum test forces or displacements must
be known. If the test forces or displacements are known, the underpeak detectors should be adjusted to the
required levels in the operating procedure.
As with the limit detectors, the test configuration, test program, and fixturing are all factors to consider when
determining the underpeak detector levels. For example, consider the following test situation:
• The test will run in displacement control
MTS Material Test System Operation 51
6.0 Getting Started