Hach DR/2010 Instrument Manual page 71

Note: Follow the
procedure steps
for reagent
addition and color
development to
make the
standards and
blank before
using them for
calibration.
•
Piecewise Linear: C = Piecewise
Linear: C = a + bA (requires ≥ 2 data points)
•
•
Quadratic: C = a + bA + cA
•
Cubic: C = a + bA + cA
Three types of equations (linear, quadratic, or cubic) can be used
by entering values for the coefficients into the formulas that
describe these curves. To enter a calibration curve using the cubic
equation option, press the
Calib Table: 0
display. Proceed with Step 36. The instrument will prompt for
the coefficients.
24. Press . The display will show:
ENTER
&&&& 
The appropriate timing intervals in the procedure must be used when
preparing the zero concentration and calibration standards.
25. Place a sample cell containing the blank or zeroing solution in the cell
holder, close the cover and press
correct, the display will prompt you to dial in the correct wavelength.
Adjust the wavelength and press
26. The instrument displays:
&&&& 
then:
 &&&&
The actual units and decimal place displayed depend on the selections
made earlier.
(requires ≥ 3 data points)
2
2
+ dA
Where: a, b, c, and d are coefficients,
A = Absorbance and C = Concentration.
DOWN ARROW
display. Press
ENTER
# &&&
AH 5=
ZERO
ZERO
#' &&&
AH E
# &&&
  
71
(requires ≥ 4 data points)
3
key twice at the
at the Calib Formula: F3
nm
A
. If the wavelength is not
again.
nm
nm