8
Linearity:
Linearity is the difference in the bias values
through the expected operating range of the
gauge.
Linearity can be calculated as follows:
Linearity
=
Slope
x Process Variation
Precision:
Precision is a measure of the degree of
repeatability between measurements.
(See Accuracy)
Precision is often denoted by
gauge
, which is
the standard deviation of the measurement
system. The smaller the spread of the
distribution, the better the precision.
Precision can be separated into two components, called repeatability
and reproducibility, which are related as follows:
gauge
2
repeatability
2
reproducibility
2
Reference Value
Figure 3. Linearity
Distribution of
Measurements
of the Same
Part
Figure 4. Precision
