DeFelsko PosiTector 200 Guide D'utilisation page 10

Graphics
When selected, the Gage displays
a graphical representation of the
ultrasonic pulse as it travels through
the coating system.
As the probe is depressed and the
ultrasonic pulse travels through the
coating system, the pulse encounters
changes in density at the interfaces
between coating layers and between
the coating and the substrate.
These interfaces are depicted by a "peak". The greater the
change in density, the higher the peak. The more gradual the
change in density, the greater the width of the peak. For example,
two coating layers made of essentially the same material and
"blended" would result in a low, wide peak. Two materials of very
different density and a well-defined interface would result in a
high, narrow peak.
The PosiTector 200 chooses the highest peak (single layer) or
peaks (multi-layer) within the Set Range. For example, if the
number of layers is set to 3, the three highest peaks would be
identified with small red triangles. The peak values are also
displayed numerically as thickness measurements.
NOTE:
The Graphics display can also be accessed using the
Set Range menu option.
Use the navigation Up (move left) and Down (move right) buttons
to highlight icons on the graphic display.
Zoom - Visually magnifies the waveform of the displayed
peaks for more visibility. Pressing the (+) or (-) button repeatedly
will increase/decrease the zoom.
Set Range - Press the (-) or (+) buttons to adjust the
Gage's Lo or Hi measuring range. (pg. 5
(Advanced
models only)
8
)