MTS Series 793 Application - Manual (Page 220)

MTS MultiPurpose TestWare®
Sweep Command Process
Command Processes 220
Sweep Command Process
About the Sweep Activity
With the Sweep activity you can sweep a command waveform between two
frequency values in a linear or logarithmic progression at a constant amplitude.
Sweep Activity
When a sweep command starts, it always moves first to End Level 1, and then to
End Level 2.
Sine, ramp, and square
start levels
Sine, ramp, and square commands use the first segment to bridge any difference
between the current level and the End Level 1 that you specify. This transition
segment is counted as the first segment.
A high-speed transition segment can result in an unwanted spike (or bump)
in your command signal.
Unwanted command-signal spikes can damage the physical test specimen.
To avoid spikes in the command signal, use a Ramp activity to bridge where end
levels and start levels differ greatly. If an activity end level is not near the start
level of your cyclic command, the activity uses the first segment to move all the
way from the current level to the start level at the transition speed that you specify.
Example: Frequency
sweep from 0.5 Hz to 15
Hz at sweep rate of 5 Hz/
sec.
CAUTION