Fisher FERITSCOPE FMP30, Руководство оператора

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Page 218 Operator‘s Manual FERITSCOPE
®
FMP30
Glossary
entire lot (batch, unit of production).
Random sample size
Number of parts, combined into a random sample.
Range R
Reference measurement
Measurement on a reference sample to check the normalization or cal-
ibration which was performed before.
Reference sample
Specimen with a known

-ferrite content on a defined reference area
that can be used to check the calibration. The

-ferrite content within the
reference area should be as regular as possible. The reference sample
should have the same properties (geometry, etc.) as the specimen on
which the calibration was performed. The reference samples may be
from in-house production or may be from external sources. The

-ferrite
content of a reference sample should have been determined using a re-
liable and properly calibrated instrument. Reference samples are used
for the monitoring of test equipment.
With contacting measurements, reference samples are subject to wear
and tear in the same manner as the calibration standards. The wear and
tear is dependent on the properties of the surface and on the probe
which used for measurement. For this reason, reference samples have
to be checked regularly and replaced by new reference samples if the
wear and tear becomes significant.
Re-initialization
The restoration of the default settings of the instrument. With a re-initial-
ization of the instrument, all Applications are deleted, i.e., the stored
measurement data as well as the normalization and the corrective cali-
bration of all Applications. After a re-initialization, all Applications must
be set up anew! In addition all settings in the service functions are reset
to the default settings (i.e., to the factory settings). If necessary, the set-
tings will have to be made again. However, time, date and language
are not reset by the re-initialization. The coefficients of the master char-
acteristic that is stored in the EEPROM of the probe plug are not affected
by a re-initialization because the re-initialization concerns only the mem-
ory of the instrument.
Repeatability/Repeatability precision
The standard deviation of the measurements taken under repeatability