Page 226
Operator‘s Manual FERITSCOPE
®
FMP30
Glossary
certainty takes the measurement uncertainty (U
m
) of the control measurement
and the specified measurement uncertainty (U
r
) of the standard (= reference
part) into account for a confidence level of 95.45 %, corresponding to the
extension factor k=2. The calculations are made according to ISO/IEC
Guide 98-3.
U
m
:
Measurement uncertainty (k=2) of the control measurement based on stochastic errors
t:
Student factor (can be found in commonly available reference books e.g. "Formeln und
Tabellen der angewandten mathematischen Statistik" by Graf, Henning, Stange and Wil-
rich). For example, at a 68.27 % confidence level (k=1) and n = 10, the Student factor
is t
68.27; 9
= 1.07.
s:
Standard deviation of the mean value x
m
from the control measurement
n:
Number of control measurements on the standard
U
r
:
Specified measurement uncertainty (k=2) of the standard, direct entry value or, with spec-
ified tolerance level, the calculation takes place according to the formula Gl. 1
T:
Amount of the specified tolerance data of the standard
1.653: Factor for the confidence level of 95.45 % (k=2), resulting from the variance of the rec-
tangular distribution. For the confidence level of 68.27 % (k=1), the factor is 1.
Unit of measurement
Unit for displaying measurement data. In
-ferrite content measurement,
the common units of measurement are ferrite numbers (FN) or ferrite per-
cent (Fe%).
USL
Upper specification limit.
Specification limits (LSL and USL)
Variable features
Variance
Mean squared deviation. The square root of the variance is called stan-
dard deviation.
X
Countrate
X
Base
Zero point of the calibration curve. Countrate obtained when measure-
ments are taken on the Base of the calibration standard set.
Uncertainty (k=2) =
(U
m
(k=2))² + (U
r
(k=2))²
U
m
k=2
2 t 68.27 %, n - 1
s x
m
n
-------------
=
U
r
k=2
1.653 T
3
-------
=
(Gl. 1) or entry value for U(k=2)
Содержание FERITSCOPE FMP30
Страница 1: ...FERITSCOPE FMP30 Operator s Manual Coating Thickness Material Analysis Microhardness Material Testing ...
Страница 63: ...Page 58 Operator s Manual FERITSCOPE FMP30 Applications Fig 5 3 Example for linking of applications ...
Страница 235: ...Page 230 Operator s Manual FERITSCOPE FMP30 Glossary ...
Страница 240: ...Operator s Manual FERITSCOPE FMP30 Page 235 X Xn 79 ...
Страница 241: ...Coating Thickness Material Analysis Microhardness Material Testing ...