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Select this calibration mode if
• several calibration points are available which are very closely adjacent, so that not
the entire measuring range is covered by samples. With minor errors occurring
during sampling or in the lab, the calibration curve may be significantly falsified.
In this case it may even be better to do only one-point calibration (see Figures 28
and 29).
or
• the unit g/cm
3
has been selected
or
• sampling can only be done very inaccurately, so that the samples are subject to
errors.
Calibrate mode 3:
Select curve fit with linear and square coefficients (squ) if
• the entire measuring range has been covered evenly by several (at least 3) cali-
bration points.
• the measurement is run in % concentration, °Bx or another unit which is not in
linear proportion to the density.
Calibrate mode 4:
Select curve fit with linear, square and cubic coefficients (cub) if
• the same conditions exist as for calibrate mode 2, but at least 4 value pairs are
available and the actual measurement shows that with calibration mode 3 devia-
tions occur in parts of the measuring range.
Calibrate mode 5 (auto)
The program selects the best curve fit; square or cubic curve fits are selected only after
strict tests have been performed in order to rule out incorrect use of a curve function due
to random dispersion of the data.
At least 4 value pairs have to be available for this calibration mode.
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