MC Calibration
Calibration Reports
UniCel DxC Systems Instructions For Use A13914 Troubleshooting Calibration and Result Errors
October 2005 Page 13-5
13
Calibration Reports
The Calibration Report can be a useful tool for identifying issues. Table 13.4 below
defines the Fields in the order they are shown for each chemistry on a typical ISE
Module Calibration Report.
Table 13.4 ISE Module Calibration Report Field Definitions
Field Description
Sample Reference The difference between the sample and reference ADC
values. This is used for the back-to-back, range, and span
checks.
For CO
2
, the sample reference value is the ratio between
the sample and reference readings.
Sample The average of eight ADC readings of the calibrator
sample.
For CO
2
, the sample ADC represents the rate of pH change
initiated by the calibrator sample.
Sample Deviation Each sample ADC is actually an average of eight readings.
The ADC difference between the minimum and maximum
readings must be less than the predefined limits a noise flag
will occur. This does not apply to CO
2
.
Reference The average of the eight ADC readings corresponding to
the measurement of the Electrolyte Reference Solution.
For CO
2
, the reference ADC represents the rate of pH
change initiated by the reference reagent.
Reference Deviation Each reference ADC is actually an average of eight
readings. The ADC difference between the minimum and
maximum readings must be less than the predefined limits,
otherwise a noise flag will occur.
Span The difference between the average of the
Sample-Reference values reported for each calibrator level.
The value is compared to an expected value and if the
calculated span is less than the expected span, the
calibration is flagged.
Set Point The concentration value assigned to the calibrator level.
Set Point Units The units assigned to the set point value.
Replicates Used The field indicating which replicate of a calibrator level is
used for a particular chemistry.
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