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DMP30 / DMP40
Calibration
6. Did you deactivate the lock function in step 2.?
• Yes: Reactivate the lock function: 72.
Function is activated:
• No: Continue with step 7.
7. Exit the calibration menu: , the name has now been changed.
9.10 Checking the precision of a calibration
The Check Calibration function checks during a control measurement whether the
mean value of the control measurement matches the nominal value of the used foil
within the measurement uncertainty (in accordance with ISO/IEC Guide 98-3).
Important to know
The Check Calibration function allows you to check the calibration state of the
selected calibration and the measurement accuracy of the measurement sys-
tem. The result of the check applies only to the calibration selected.
The check must be performed under the same conditions applied for the cali-
bration procedure, at the same temperature, using the same base material for
example.
The precision of the calibration is limited by the measurement uncertainty of
the calibration standard (calibration foil). The measurement uncertainty of the
calibration must not be smaller than the measurement uncertainty of the cali-
bration standard used. To improve the calibration precision, you must use cal-
ibration standards with smaller measurement uncertainties for the calibration
procedure.
The determined measurement uncertainty applies only to a small range around
the nominal value of the foil for which the control measurement was per-
formed.
If you wish to determine the measurement uncertainty for a measurement
range, perform control measurements on two foils that limit the measurement
range. You can determine the measurement uncertainty for this measurement
range through a linear interpolation of the two measurement uncertainties of
the control measurements on the two foils.
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