Fisher FERITSCOPE FMP30, Руководство оператора, Страница: 99 / 241

Page 94 Operator‘s Manual FERITSCOPE
®
FMP30
Measuring
7.4 Checking the Current Calibration State
The CAL-Check function checks whether the mean value of the check mea-
surement matches the reference value of the standard to within the scope of
measurement uncertainty (in accordance with ISO/IEC guide 98-3).
When to perform

Acquisition of the current calibration state of the measurement system,
i.e. how accurately does the measurement system measure in the
opened application file

Acquisition of the measurement uncertainty of the measurement system
for the measuring application of the opened application file, e.g. nec-
essary for measurements, whose measurement uncertainty is acquired
according to ISO/IEC Guide 98-3
Important to know

Using the instrument function, you can check the calibration state and
the measuring accuracy of the measurement system. The result of the
check applies only to the open application file and its measuring appli-
cation.

If a corrective calibration is saved in the open application file, the
check must be carried out under the same conditions under which the
corrective calibration was carried out. For example, at the same tem-
perature, with the same standard etc.

The determined measurement uncertainty only applies to a small area
around the reference value of the standard for which the control mea-
surement was performed. If you wish to determine the measurement
uncertainty for a measurement range, perform control measurements
on two standards limiting the measurement range. You can determine
the measurement uncertainty for this measurement range through a lin-
ear interpolation of the two measurement uncertainties of the control
measurements on the two standards.
You need the following for the control measurement:

1 to max. 3 standards (= reference parts), used for the corrective cali-
bration. If no corrective calibration is saved in the application file, use