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MC Calibration
Sample/Reference Deviation
Troubleshooting Calibration and Result Errors
UniCel DxC Systems Instructions For Use A13914
Page 13-4
October 2005
Sample/Reference Deviation
• The Sample and Reference deviation error checks are used as a measure of noise for
electrolytes.
• Each Sample ADC and each Reference ADC is actually an average of ten readings.
• The difference between the high and low values (deviation) of the ten electrode
readings (taken milliseconds apart) must be within the maximum deviation.
• Maximum deviations are as shown in
below:
Span
• Span is a measure of sensitivity and verifies that two consecutive calibrator level
ADC values are a minimum distance apart.
• The difference between the average ADC value of Calibrator 1 and the average
ADC value of Calibrator 2 or between the average ADC value of Calibrator 2 and
the average ADC value of Calibrator 3 must exceed the minimum span limit.
• Select Calibrator Acceptance Limits under Options in the Rgts/Cal screen to view
current calibration limits.
Table 13.2
Digital-to-Analog Conversion (DAC) Check Limits
Chemistry
DAC Limits
Low
High
NA
400
5400
K
-5900
-900
CL
-2300
2700
CO2
-30000
-20000
CALC
-125
4875
Table 13.3
Maximum Allowable Sample/Reference Deviations by Chemistry
Chemistry
Maximum Deviations
Sample
Reference
NA
200
200
K
150
150
CL
200
200
CALC
150
150