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Verifying Multichannel Pipettor Performance with Standard Dispense Solutions in the SpectraMax Plus (MaxLine Application Note #28)

rmula is: if the absolute value of the difference between the measured volume and the nominal volume is less than 1% of the nominal volume, the outcome is (i.e., left blank) otherwise it is Out.

An example of results obtained with an automated pipettor (Pipettor#1) set to deliver 200 L is shown in Figure 13. In this particular example, two of the eight pipettor channels were slightly outside the acceptable range.

NOTE: If you wish, you can also flag pipettor channels which give a standard deviation above a certain limit. For example, the formula to indicate pass/fail with respect to a standard deviation limit of 2.0 could be: If(Std.Dev<2.0,Pass,Fail).


CREATING A CUSTOMIZED SUMMARY SECTION
You can create a customized report in a Notes section to report final results. An example of such a report is shown in Figure 14. The Nominal Dispense Volume was brought into the Notes section by creating a summary linked to Sum#1 in thePipettor#1 Group Table. The formula for the linked summary is Sum#1@Pipettor#1.


To obtain a Pass/Fail outcome for the pipettor, a column was created in the Pipettor#1 Group Table in which the results from the Outcome column were converted to numerical values ( Figure 15.) The column is named HiddenColumn, because it is normally hidden from view to simplify the Group Table. The formula for the hidden column is If(Outcome=,1,10).


The OVERALL PIPETTOR OUTCOME in the Notes section was created by adding another summary, linked to the Pipettor#1 Group Table with the formula: if (Max(HiddenColumn@Pipettor#1)>1,Fail,Pass). The formula refers to the numerical values in the hidden column if any one of the numerical values exceeds 1, the pipettor fails the performance check.

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