MTS Series 793 Application - Manual (Page 251)

Model 793.71/72 Time History Output Process
MTS MultiPurpose TestWare® Command Processes 251
You may make limited changes to the contents of an RPC time history file
between the time its name is entered here and when it is actually used during
the execution of a procedure. MPT will compare the file header at execution
time to its contents during the definition phase. If it detects any differences in
any of the following parameters, an error status will be returned and the test
will be terminated:
• RPC File Type
• Number of channels
• Points per group
• Sampling rate
• Channel full scales
• Channel descriptors
• Channel units
• Channel mapping
Passes Specifies the number of passes the drive file will play out each time the process
runs, as specified on the General tab.
This function differs from the Execute Process value on the General tab. The
difference is that the Time History Output process will come to a complete
halt and then re-initialize and restart for each Execute Process count specified
in the General tab. This creates a delay between the end of one count and the
beginning of another.
Passes entered here do not result in a delay because the application simply
reads data from the beginning of the already opened file and queues it in real
time, which eliminates any delay.
Relative Time Signal If selected, the process reads the current command value on each channel when
the process runs. These commands are added to each point in the time history
as it is read from its file, and the modified command is played out. With this
feature, you can preload a channel and then play out the time history relative to
that preloaded value. If not checked, the time history is played out as it is
stored in the disk file.
Command Tab (part 2 of 3)
I TEM D ESCRIPTION