Calibration Foils And Standards - Elcometer 456 Operating Instructions Manual

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5.3 CALIBRATION FOILS AND STANDARDS

Calibration adjustment should be carried out with
the appropriate probe on the same type of metal,
the same curvature and similar finish to the item to
be measured. 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.
F ( ): These
OILS SHIMS
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.
26
are coating thickness
Note: To calibrate 5 mm (200 mils) and 13 mm
(500 mils) range gauges it will be necessary to
stack the foils (Figure 29). Care must be taken to
avoid errors due to placing the foil labels between
the foils.
Figure 29. Stacking foils to increase thickness
C : Thickness standards using
OATED STANDARDS
typical substrate materials coated with hardwearing
materials and measured
independent of the gauge.
Coated standards are most often used to confirm
that the gauge meets its specifications if it is not
possible to use foils (shims).
Serial no. TK1009
Inspected by
micron mils/thou
502 19.75
using techniques