Hitachi 902 - Description of Model 902 Polygonal Line Calibration; Formula of Calibration Curve

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9.2.1 Description of Model 902 Polygonal Line Calibration
[Formula of calibration curve]
Cx = K(X - B) + C1
(1) When CALIB. POINT = 1
(a) R. B. (Reagent Blank)
Updating of S1ABS: S1ABS = (X1(1) + X1(2))/2 (unit: 10
-4
Abs)
(2) When CALIB. POINT = 3 to 6
(a) R. B. (Reagent Blank)
Same as in 1-point polygonal line calibration
(b) Full
Updating of S1ABS: Same as in R.B.
Updating of K factor (unit: 10
-4
Abs)
K1 =
C2
−
C1
X2− X1
× 10
-4
K2 =
C3
−
C2
X3− X2
× 10
-4
K3 =
C4
−
C3
X4− X3
× 10
-4
K4 =
C5
−
C4
X5− X4
× 10
-4
K5 =
C6
−
C5
X6
−
X5
× 10
-4
For output, K1 to K5 values in the above equations are multiplied by the correction
factor which is obtained from the number of digits below the decimal point of STD
(1) concentration (set on the chemistry parameter screen).
Number of Fractional
Digits of STD (1)
Correction Factor
0 1
1 10
-1
2 10
-2
3 10
-3
For X1, the previous X1 value (S1ABS of CALIBRATION LIST) is used.