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Operator‘s Manual FERITSCOPE
®
FMP30
Page 215
Glossary
Parity
An error checking method where the digits of a number of error-free
transmitted bit groups must add up to an even or an odd number. During
data transfer the parity bits are added to the data bits of each character
or Byte to be transferred. In every word, this bit is set such that Ones of
the byte always result in an even or an odd number (corresponding to
an even or odd parity). The type of parity must be defined prior to the
data transfer. By checking the parity, the receiver can determine if sim-
ple bit transfer errors occurred.
Pin
Connectors for integrated circuits or connecting plugs of technical devic-
es. Usually in the shape of a pin.
Precision
Agreement between the single measurement results under precisely de-
fined test conditions. The precision is composed of reproducibility and
repeatability.
Tolerance limits (Specification limits) Specification
;
Process capability
The process capability is assessed by the indices cp and cpk. (For fur-
ther information see / 4 /.)
Process capability is met when the process capability exceeds specified
values. Commonly required is:
and
Process capability is a measure for long-term influences stemming from
the so-called 6 Ms (mankind, machine, material, method, measuring in-
strument and milieu). To determine the process capability, a longer se-
quence of cyclical production steps needs to be employed (same prod-
uct, same production line, same conditions, but different orders on
different days).
Process capability index
The process capability is assessed by the indices cp and cpk. (For fur-
ther information see / 4 /.) The process capability index cp takes the
deviation of a process in relation to the width of the specification limit
range (USL-LSL) into account.The process capability index cpk takes the
position of the mean value in relation to the set specification limits into
account. The FERITSCOPE
®
FMP30 computes Cp and Cpk as follows:
c
p
1.33
c
pk
1.0