MTS Series 793 Application - Manual (Page 366)

MTS MultiPurpose TestWare®
Peak/Valley Change Detector Process
Event Process Descriptions 366
If you do not use Channel Reference, the process will begin counting cycles
immediately after the number of cycles you specify. For instance, if you specify 6
cycles, and the waveform begins with a taper that includes 2 cycles, the process
will begin monitoring for peaks and valleys on cycle 7.
In either case, if you press stop and then run on the Station Controls panel, the
process will begin the count over.
Reference values
On the Options tab, if you select Default under Reference Values, the first peak
and valley detected by the process become the reference levels for the tolerance
band.
Note The process will not generate a trigger signal based on the first peak or
valley.
On the Options tab, if you select User-specified under Reference Values, you
type the upper and lower level values for the tolerance band. This is a useful
feature if it is possible that the first peak and valley used to establish the
reference values could be unusually large or otherwise irregular. With User-
specified reference values, the controller uses your preset reference values and
compares them with the very first peak or valley, (at the start of the process or
after the process resets itself after issuing a trigger). Because of this, in the
Trigger Continuously mode, the process may generate more triggers if you use
user-specified reference values than if you use default reference values.