Hach-Lange DR 3900 User Manual - Manual (Page 101)

101
Expanded programs
K
1
A
1
+ K
2
A
2
+ K
3
A
3
K
1
A
1
+ K
2
A
2
+ K
3
A
3
+ K
4
A
4
K
1
A
1
/ K
2
A
2
(K
1
A
1
+ K
2
A
2
) / K
3
A
3
(K
1
A
1
+ K
2
A
2
) / (K
3
A
3
+ K
4
A
4
)
A
1
refers to the absorbance at wavelength 1
A
2
refers to the absorbance at wavelength 2, etc.
K
1
refers to the coefficient at wavelength 1
K
2
refers to the coefficient at wavelength 2, etc.
If a subtraction has to be completed, the factors can be entered
with a minus sign.
6. To change the wavelength, press the λx key.
7. Enter the required wavelength factor using the alphanumeric
keypad.
8. Press OK to confirm the selection.
9. To change a coefficient, press one of the "K
X
" keys.
10. Enter the required coefficient using the alphanumeric
keypad.
11. Press OK to confirm the selection.
Note: Up to 5 digit number values can be entered! A maximum of
four decimals places are possible.
Concentration Factor:
1. Press Concentration Factor: Off in the "Options" menu.
2. Press On to highlight this feature.
3. Press Factor.
4. Enter the factor with which the absorbance measurement is
to be multiplied.
5. Press Unit.
6. Select the respective concentration unit from the displayed
list.
7. Press OK to confirm.