4. User-defined corrections ABL800 FLEX Reference Manual
4-2
General information
Purpose of use
User-defined corrections are most commonly implemented in situations where the
values measured for a particular parameter by two or more analyzers, deviate
consistently from each other.
NOTE: Since the performance of all analyzers is tested as described in Chapter
5, Performance Characteristics, and each instrument is assumed to
operate accurately and optimally, the unnecessary correction of
parameter values by the user can lead to inaccurate measurements
being reported.
User-defined
corrections
User-defined corrections are based on a linear correlation between the measured
values (without user-defined corrections) and the displayed values (with user-
defined corrections).
The correction factors for each measured parameter are the slope and the offset of
the correction line. With user-defined corrections it is possible to change the values
of either one or both of these correction factors, depending on the parameter type.
Corrected value = Slope × Uncorrected value + Offset
The diagram below is a schematic representation of the relationship between
correction lines without and with user-defined correction.
Continued on next page
Displayed (corrected)
parameter value
Measured
(uncorrected)
parameter value
Correction line with
user correction
0.0
Slope = 1
Correction line without
user correction
Offset
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