Eppendorf XplorerPlus Adjustment - Manual (Page 16)

Change adjustment
Eppendorf Xplorer
® /Xplorer ® plus
English (EN)
16
2.7.3 3-point adjust.
After you enter the density, three different volumes and the mean value of the corresponding weighing
result, the Xplorer pipette determines two correction factors. The factors are correct from measuring point
to measuring point in the selected volume regions and for the selected work technique. The respective
factor is, however, also used below the first and above the third measuring point. You must carry out a
gravimetric test to check the validity of the factors. When entering the data for the three volumes and the
three weighing results, follow the instructions as for the example of 1-point adjustment (see p. 12). In the
following example the adjustment was changed for 25%, 50% and 75% of the nominal volume (see
Fig. 2-6 on p. 16). Strictly speaking, the correction only applies to the range between 25% to 75%.
However, the correction is used for the entire measurement range.
Abb. 2-6: Example 3-point adjustment: Correction data was entered for 25%, 50% and 75% of the nominal volume
Fig. 2-6: Example 3-point adjustment: Correction data was entered for 25%, 50% and 75% of the
nominal volume
Select three significantly different volumes suitable for your task. When using three slightly
different volumes (for example, 55%, 50% and 45% of the nominal volume), measured
values outside of the test volumes may be strongly falsified.
min.
Factory setting
Legend:
3-point adjustment at 25%, 50% and 75%
max.
Piston stroke
of Xplorer
max.
Volume
display of Xplorer
25 % 50 % 75 %