DeFelsko PosiTector 200 v.2.0 - Manual (Page 6)

6
Set Gates Option Set Gates Option
Set Gates
Standard Model Advanced Model
Each probe has a measuring range as shown on
page 19. For example the C probe can measure
coatings in the range of 50 to 3800 microns (2 to
150 mils).
Gates are used to narrow the range of thickness that
the Gage examines. Gate A sets the minimum
thickness limit and Gate B the maximum.
For most applications the default Gate values do not
have to be adjusted. But some conditions may exist
in the user's application that cause the Gage to
display very low or non-repeatable readings. These
conditions include…
·rough or textured coatings
·hard (dense) coatings
·coatings applied in multiple layers
·coatings applied on a very thin, hard substrate
Important: When measuring, the Gage finds the
most distinct interface within the two Gate settings. If
the coating thickness is outside this range, incorrect
or dashed readings may occur. The PosiTector 200
interprets the largest “echo” or echoes within the
gates as the coating/substrate echo.