MTS Series 793 Application - Manual (Page 221)

Sweep Command Process
MTS MultiPurpose TestWare® Command Processes 221
Cycles and segments You can repeat cycles or segments. Two segments create one cycle. Repeating a
full cycle first goes to end level 1 and ends at end level 2. Repeating a segment
can end at end level 1 or end level 2 (depending on whether the count value is
odd or even).
Note The end levels can be set to values greater than the full scale. The
command will attempt to reach the specified end level; however, the
feedback will become saturated before reaching the specified end level
and will cause a hydraulic interlock.
End levels
The two end levels specify the amplitude of the waveform. When two test
command activities with different end levels are sequenced, the transition
between them is accomplished at the rate and segment shape of the following
activity. This provides a smooth transition between test commands.
Example
Suppose you run a Sweep activity that completes a cyclic command at End
Level 2 (in this case, +2 cm). Next, suppose you run another Sweep activity in
which End Level 1 = –1 cm and End Level 2 = +1 cm. The transition segment
bridges the two commands from the +2 cm level to the –1 cm level at the time,
rate, or frequency of the second activity.
The conventional way to
define the duration of a
cyclic command is by
frequency or time.
End level
Start level
End level 2 = 5 kip
End level 1 = 0 kip
Frequency = 5Hz
Rate = 5 kip/1 second
Time = 0.1second