Ada ZCT AUTO, Operating Manual, Page: 13 / 40

MEASUREMENT FOUNDATION
ZCT AUTO
13
10) Deformation of the test piece
Measuring head will make test piece with soft coating deformed, so unreliable data may be gained from these test pieces.
2. THE PROVISIONS WHICH SHALL BE COMPLIED WITH WHEN THE INSTRUMENT IS USED.
1) The properties of basal body metal
The magnetic property and surface roughness degree of the basal body metal of standard piece should be similar to those of
the basal body metal of test piece.
2) The thickness of basal body metal
Check whether the thickness of basal body metal exceeds the critical thickness or not.
3) Edge effects
Measure should not be conducted in the place which is close to the abrupt change parts of test piece such as edge, hole and
internal corner etc.
4) Curvature
Measure should not be conducted on the curved surface of test piece.
5) The number of readings
As the instrument’s readings every time are not identical, so we have to take several readings within each measured area.
The local differences of coating thickness also require multiple measurements within speciied area. It should be so even
more on rough surface.
6) Surface Cleanliness
Any attached materials such as dust, grease and corrosive substances etc. should be got rid of before measurement. How-
ever, any coating substances should not be removed.