Checkline PT-200 - Manual (Page 12)

This menu button converts the display and all stored
readings from mils to microns or vice versa.
12
Units
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 coatings
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 Advanced chooses the highest
of peaks when trying to determine coating layer
thickness. For example, if the number of layers is set
to 3, the 3 highest peaks between the A & B Gates
are selected as the interfaces between these layers.
The peaks that the Gage selected are indicated by
black triangle arrows.
The top (A) and bottom (B) Gate values (pg.6) are
displayed as two horizontal lines at the top and
bottom of the graphics area. Their current values are
shown to the right of each line. Gate A, the minimum
limit, is at the top. Gate B, the maximum limit, is at
the bottom. Echoes or peaks (thickness values)
outside these Gates are ignored. Gate values are set
and modified using the Set Gates menu option.
This Graphics display can be manipulated with the
Set Gates menu option. In addition to being able to
adjust the Gate values, a Cursor can be positioned
anywhere between the two Gate values to
investigate other peaks.