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MANUAL No. 99MBH001B
2.2.3 Notes on calibration2.2.3 Notes on calibration
2.2.3 Notes on calibration2.2.3 Notes on calibration
2.2.3 Notes on calibration
Although the provided reference specimen was used as a base metal in
the above example to explain calibration procedures, use a base metal
identical in material, shape, and thickness with that of the workpiece
for calibration, for improved accuracy in measurement. If such a base
metal is not available, use one as similar in these three characteristics
as possible to the workpiece to be actually measured.
About the base metal sizeAbout the base metal size
About the base metal sizeAbout the base metal size
About the base metal size
For a flat-surface base metal, more than 30 x 30mm is recom-
mended to use for reliable calibration, although the portion of
φ5mm (.2") [for 179-741, 179-745 & 179-746 ] or φ8mm (.3")
[for 179-755 & 179-756] can be measured.
1) Material1) Material
1) Material1) Material
1) Material
The material of the base metal used for calibration should be as similar
to that of the workpiece as possible.
2) Shape2) Shape
2) Shape2) Shape
2) Shape
The shape of the base metal used for calibration should be as similar
to that of the workpiece as possible. Calibration should be performed
at a point where measurement is to be actually performed.
Ex.:Ex.:
Ex.:Ex.:
Ex.:
When taking measurement at point A, calibrate at point A'. The same is
true with the other points in Fig. 5.
Fig. 5
3) Thickness3) Thickness
3) Thickness3) Thickness
3) Thickness
The thickness of the base metal used for calibration should be as simi-
lar to that of the workpiece as possible. But a base metal of over 1mm
in thickness hardly affects thickness measurement.
'
B'
Base metal
C'
D'
A
B
Workpiece
C
D
Coating
