Hitachi 902 - Cell Blank Compensation

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9.3.2 Cell Blank Compensation
<Supplementary explanation>
The cell blank calculation method (Note) and compensated points vary with analytical method.
For details, refer to the classification of analytical methods.
NOTE: If an alarm is indicated for any of cell blanks 1 to 4, the following table will be used.
Number of
Alarms
Cell Blank Value
Data Alarm
(cell blank abnormal)
1 Mean value of 2 data without alarm Not indicated
2 Indicated
3 Indicated
Raw absorbance
at main
wavelength
Raw absorbance
at sub wavelength
Cell blank
compensation
Cell blank
compensation
Calculation of
cell blank value
Calculation of
cell blank value
Raw absorbance of
cell blank at main
wavelength
Raw absorbance of
cell blank at sub
wavelength
Raw absorbance at
main wavelength
after cell blank
compensation
Raw abosrbance at
sub wavelength
after cell blank
compensation
1 to 35 max.
1 to 35 max.
1 to 35 max. 1 to 35 max.
1 to 4
1 to 4
(
)
C C C
4
1 2 3
+ + + C
4
(
)
C C C C
1 2 3 4
4
+ + +