MTS Series 793 Application - Manual (Page 365)

Peak/Valley Change Detector Process
MTS MultiPurpose TestWare® Event Process Descriptions 365
Sensitivity A sensitivity value specifies how much the signal must change to detect a peak or
valley. It can be used to keep the process from seeing signal noise as a new peak
or valley.
• Setting the sensitivity too low may cause signal noise to be recognized as
peaks and valleys.
• Setting the sensitivity too high may cause low amplitude signals to be
missed.
Tolerance
The tolerance band specifies how much a peak or valley must deviate from the
associated reference levels before the process generates a trigger signal.
For example, if the established peak value is +5 cm, and the tolerance is set to
±0.25 cm, the process will not generate a trigger signal unless the peak value
registers greater than +5.25 cm or less than +4.75 cm.
Enable after
On the Options tab, you can use the Enable After command to specify how
many feedback cycles will occur before the process begins to monitor the
selected signal. This allows the signal to “settle-in” or stabilize before it is
monitored.
If you select a channel for the Channel Reference on the Command tab, the
process will begin counting cycles after the tapering is complete.
For example, if you specify 6 cycles, and the waveform begins with a taper that
includes 2 cycles, the process will begin monitoring peaks and valleys on cycle 9.
Determines when a peak
or valley is detected.
The sensitivity setting is
the amount the signal
must change before it is
considered a new peak
or valley.
Detected
Peaks
Detected
Valleys
Sensitivity
Peak
Valley
Tolerance Bands
Detector Triggers