Density Meter LB 444 SECTION 6. BASICS OF DENSITY MEASUREMENTS
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6.2.1.3 Multi-Point Calibration
The absorption coefficients and thus the curve function are calculated from the
value pairs entered. At the same time, a factor (square error) will be calculated
(only if more than three value pairs were entered), indicating how well the cal-
culated curve approximates the entered values. The lower the displayed nu-
merical values, the better the curve fit. The square error is a criterion for the
quality of the curve fit within one curve shape. It cannot be used as a criterion for
selecting a certain curve shape. The decision for the most appropriate curve
shape for the data is made in the calibration mode auto.
Value of square error:
< 0.0005 very good calibration
< 0.0019 good
< 0.002 still useful
With larger values you should check your calibration particularly with re-
gard to incorrect entries.
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