DeFelsko PosiTector 200 v.3.1 Full Manual - Manual (Page 38)

38
Coating Thickness Standards
Certified Thickness Standards are used to verify the accuracy and
operation of coating thickness gages and are an important
component in fulfilling both ISO/QS-9000 and in-house quality
control requirements. Contracts often specify that coating
thickness measurements be taken by gages whose measurement
accuracy is traceable to a National Metrology Institute such as
NIST or PTB.
Standards are typically purchased as an accessory to coating
thickness gages. Many customers find it more practical to verify
the accuracy of their own gages in-house, rather than utilize
DeFelsko’s calibration services. This is particularly true when
many gages are in use and/or when accuracy verification is
performed often.
There are 4 types of coating thickness standards available:
Certified Coated Metal Plates are the best solution for verifying
the calibration, accuracy and operation of most magnetic, eddy
current or ultrasonic coating thickness gages. They fulfill both ISO
and in-house quality control requirements. At ±0.43µm (±0.017 mil)
Certified Coated Metal Plates are the most accurate solution.
Certified Polystyrene Blocks are for use with C and D probes.
Certified Plastic Shims (foils) provide an economical alternative
to coated metal plates. They have a reduced accuracy of ±2 µm
(±0.08 mil). A coating thickness Gage measures shim thickness
when this shim is placed over a rigid, flat surface.
Non-Certified Plastic Shims (foils) provide a quick operational
check of the Gage and they allow the user to perform practice
measurements when placed over a rigid, flat surface. A set of 5
shims is included with every PosiTector 200 probe.