Fisher FERITSCOPE FMP30 Operator's Manual page 211

Countrate
Digitized form of the measurement signal, which is proportional to the

-ferrite content and is produced in the probe by the

larger the -ferrite content is, the smaller is the countrate.
curve (characteristics)
The numeric values of the normalized countrate Xn range between 0
and 1, and are calculated according to the following equation:
where:Xn = normalized countrate
X = count rate measured on the specimen
X = countrate measured on the Base of the calibration standard set
Base
Xs = countrate measured on a specimen with no
C.O.V.
Coefficient of variation. The standard deviation of a measurement series
in percentage points, i.e., the standard deviation in reference to the
mean value. For many manufacturing processes, C.O.V. [%] is a char-
acteristic process constant. A change in a parameter during the coating
process can alter C.O.V. [%] significantly; thus, a sudden change of
C.O.V. [%] indicates a change in the process conditions. C.O.V. [%] is
calculated as follows:
where:COV = coefficient of variation
Fe. = mean value
s = standard deviation
Cp Process capability index
Cpk Process capability index
CR (Carriage Return)
Curvature
Excess and Kurtosis are measures for the curvature (e.g., how pointed
or how wide) of a distribution compared to a normal distribution. A pos-
itive curvature indicates a relatively narrow, pointed distribution. A neg-
ative curvature indicates a relatively flat distribution. The curvature of a
normal distribution is Zero. When evaluating the open Application with
Page 206
X –
Xn = -------------------------- -
Xs –
s

V = ------- - 100
Fe.
Carriage Return (CR)

-ferrite content. The
X
Base
X
Base

-
ferrite content
 
%
Operator's Manual FERITSCOPE
Calibration
®
FMP30