IMPACT ECHO (IE)
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• # Recs. Number of Record is a total number of IE data records you want to save. This parameter
can not be changed after the data was taken.
• Pre-Trigger is number of points before the triggering point that data collection starts. This
parameter must be 0 for the IE test. This parameter can not be changed after the data was
taken.
• Trigger Level % is the minimum signal amplitude (in terms of percentage full scale) to trigger
data acquisition. In this case, the trigger level was set at 6%. Therefore, the system will start
acquiring data once the absolute amplitude of the signal exceeds 0.6 volt. This parameter can not
be changed after the data was taken.
• Channel Setup. For the IE test, only one channel (connected to the IE head) will be used. Ch 1
must be turned on for the IE test and this cannot be changed.
• Sol. This value can be “on” or “off”. If the solenoid is on, the system will use the solenoid in the
IE head as a source. If this value is off, the system will wait for the external hammer as a source.
• Sol Time. This is the time to drive the solenoid. The default value is 12 us. However, this value
may need to be higher for the underside or underwater testing.
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