Hach DR/2010 Instrument Manual page 74

35. Press the
DOWN ARROW
&&&& 
36. Press . The display will show:
ENTER
 &&&&
37. Press . The display will show:
ENTER
&&&& 
F0 means Formula 0, which is a point-to-point (piecewise) calibration
curve. A best-fit line is not possible when using this type of curve, so
a correlation coefficient (r
Calibration Curve.
38. Press the
DOWN ARROW
2
F1: r = 0.99530
F1 denotes linear equation. F2 means a quadratic equation and F3
denotes a cubic equation. To view the r
equations, press the
Important Note: Selection of the best calibration curve should not be based
2
solely on the r value. While a quadratic or cubic may have a r
1.000, it may not be an appropriate fit for the data. There is no substitute for
printing out or manually graphing the calibration curve and visually inspecting it to
see how it fits the data.
39. Press to accept the type of calibration curve.
ENTER
The display will show (for example):
&&&& 
key. The display will show:
+ = E>. H K = .
. + 2EA?AMEIA
. H  =
2
) is not applicable (n/a). See Figure 18,
. The display may show (for example):
2
or or
F2: r = 0.99322
key.
UP ARROW
. + = >)
74
"# &&&
nm
"# &&&
nm
"# &&&
nm
2
F3: r = 0.99212
2
value of the alternative
2
value closer to
&&& "#
nm