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.
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