MTS Series 793 Application User Manual
Page 76
MTS MultiPurpose TestWare®
About Test Recovery
MPT Options Editor
76
What is not saved
When you recover a test, the test status is restored to the point where the last
snapshot was taken.
•
If the test is stopped by an uncontrolled event (such as power failure or
application failure), any data not saved to disk at the point of the shutdown
is lost.
•
If data was being transferred from the data buffer to the computer, data that
had not been transferred is lost.
DIO settings are not restored during the MPT recovery process. For information
about DIO settings, see the MTS 793 Control Software manual.
Recovery accuracy
There are two measures of “accuracy” associated with a saved test status:
•
How old is the snapshot? If the snapshot is taken one minute before the test
stops, many additional cycles may be applied to the MPT specimen that the
test status would not know about.
•
How consistent is the snapshot? If the snapshot is taken while the test is
running, each active process is checked in sequence. This results in test
status data that is taken at slightly different times.
Recovery
considerations
Review the following characteristics of the test recovery feature to understand
the advantages and disadvantages of recovering a test under different
circumstances.
•
Recovering a test that was saved periodically provides test status data that is
relatively accurate in relation to the point where the test stopped. The
shorter the period, the closer the test status is to the point of failure.
However, saving a test does require additional processor time. If the
autosave rate is too fast, the accuracy of the data acquisition processes (data
output and communication between processes) can be adversely affected.
•
Each autosave action overwrites the test status. If the system experiences an
uncontrolled shutdown, (power fails) while the system is saving the test
status, test status recovery is probably not possible.
•
The test status maintains a copy of the procedure when entering the Execute
mode in MPT.