MTS Material Test Systems - Manual (Page 47)

Table 5: Effects of Span and Setpoint on Program Signal
Description Item
Full-scale operating range 1
Testing range 2
Span affects program amplitude 3
Setpoint affects program mean level 4
Mean level offset 5
Important:
In load control, the actuator rod will move with a slight Setpoint control adjustment and will not stop
until the Setpoint control is returned to 0. Until a reaction against the load cell exists, an open loop
condition can cause a slight actuator rod drift (in proportion to the Setpoint offset from 0). The direction
of the movement caused by the Setpoint control is determined by system phasing.
Additional information can be found in the test controller’s documentation.
6.3.3.0 Calculate Error Detection Level
Each controller contains an error detector that monitors the difference between the program command and
the transducer feedback (DC error). When a controller is selected for active control, then the error detector
will (if enabled during test setup) stop the test through the system interlock if a DC error in excess of the
preset level is detected.
MTS Material Test System Operation 47
6.0 Getting Started