Dakota Ultrasonics MVX - Manual (Page 64)

Dakota Ultrasonics
60
7.5 Threshold
The Threshold is the level (sensitivity) of the signal amplitude required to trigger the
thickness reading. This level can be used in conjunction with the gain. Example:
suppose the user can visually see a potential flaw on the display, but the MVX is not
detecting on the flaw because the Gain is too low, or the Threshold to high. The
Threshold level can be decreased (lower sensitivity) in order to detect signals with
lower amplitudes. This will allow the amplitude from the reflection of the flaw to reach
and exceed the Threshold level, and enable the MVX to detect on the flaw or defect.
This can also be accomplished by increasing the Gain, allowing the signal to exceed
the current Threshold level. Lowering the Threshold (increases sensitivity), and
raising the Threshold decreases the sensitivity respectively.
The procedures to adjust the Threshold are outlined below: