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 Table 13.3 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
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