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42 Wave User Manual
Version 4
Figure 33 – Measurements in complex shapes
Let’s say that the red dot in the above figure represents the position of a flaw, as it would
be indicated in the measurement of a gate. The red dot is positioned over the horizontal
line where the probe lies. As depth is usually represented as a positive number,
referencing the red dot’s position requires using a negative number.
Hence, we need to make sure we have a unique reference system for positioning, both in
terms of surface distance and in depth.
7.5 Measurements Units
To modify the measurement units, click on Display menu and click on Units . It will switch
from SI to Imperial and vice versa.
7.6 FSH% Measurement in Gates
The Full Screen Height (FSH) in a gate will provide a measurement from 0% up to 160%
FSH. Above that number, the signal is saturated, and you will need to lower the gain in
order to have a good reading.
Note that even if a signal peak amplitude is lower than a gate, the gate will display the
FSH% if this is the measurement selected. The exception being for a signal below 5% FSH.
Surface distance
Depth