8
How to Measure
How to Measure
Prepare the test surface
Burnish the replica tape
(create a replica)
1. Prepare the test surface
2. Burnish the replica tape
3. Prepare the Gage
4. Measure
Locate a representative site for measurement.
Clean the surface to be tested. DeFelsko
recommends the use of the included putty to
remove dust, debris, or residual blast media from
the surface. Firmly press the putty onto the surface
using your fingers, and remove.
Ensuring a clean surface is especially important when
using the
PosiTector
RTR-P
to measure peak density (P
d
) and
generate surface images.
NOTE:
Select the appropriate grade of replica tape based on the target
profile. See tape instructions for assistance.
Pull a single adhesive-backed replica tape free of its release
paper. A “bull’s eye” circle of paper should remain on the release
paper (it is not used for measurement).
Apply replica tape to blasted surface. Press the
adhesive-backed ends of the tape to hold it firmly in
place during the burnishing process.
Firmly compress the foam using the rounded end of
the included stainless steel burnishing tool. Apply
sufficient pressure in a circular and x-y rubbing
motion to produce a replica with a uniform pebble
grain appearance.
Excessively hard rubbing
should be avoided because the polyester film
could become distorted.
It normally takes 30 to 60
seconds to fully compress all parts of the foam on most surfaces.
After burnishing is complete, remove the replica tape from the
surface.
