Measurement Computing eZ-NDT version 6.0.9 - Manual (Page 16)

2-10 Investigation Mode Testing 938691 eZ-NDT
Graphical Limit Changes are Enabled .
Three Views of Limit Band “A”
The third view shows the band after high and low amplitude limits have been adjusted.
The third view also shows that Low and High Frequency Limits can be adjusted.
If, following adjustments, you still can’t distinguish between “Good” and Bad parts . . .
Try changing the Pre/Post Trigger Delay Percentage value of the trigger channel. By increasing this
value, you are delaying the start of the sound measurement. This delay can be very helpful identifying
cracked parts, because a cracked part can not hold a tone. The resonant frequencies of a cracked part
die out quickly.