25
It is best to use an uncoated sample of the items to be
tested.
Calibration can be carried out using measured foils or
coated standards.
Foils (shims).
These are coating thickness standards
which have been measured using techniques
independent of the gauge. They are ideal for calibration
because they provide a known value of thickness on the
actual substrate to be measured. Calibration certificates
for foils are available upon request.
When using foils care must be taken to keep the foils
clean and free from dust and to avoid damage by
creasing particularly the thinner foils. Always remove a
foil from its storage wallet before use.
When calibrating a High Temperature PINIP™ Probe
use the special thickness standards supplied with the
probe - see “Calibrating High Temperature PINIP™
Probes” on page 31.
Note: To calibrate 5 mm (200 mils) and 13 mm
(500 mils) range gauges it will be necessary to stack the
foils (Figure 20). Care must be taken to avoid errors due
to placing the foil labels between the foils.
Figure 20. Stacking foils to increase thickness
Coated standards.
Thickness standards using typical
substrate materials coated with hardwearing materials
and measured using techniques independent of the
gauge.
Serial no.
Inspected by
micron mils/thou
502 19.75
TK1009
Serial no.
Inspected by
micron mils/thou
176.1 6.93
TK1010
Op_456_2_English.book Page 25 Friday, February 17, 2006 3:35 PM
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