Hach-Lange DR 3900 User Manual - Manual (Page 100)

100
Expanded programs
λ/ Absorbance Formula:
1. Press Absorbance Formula.
2. The formula selected in the top key determines the number
of wavelength and coefficient keys that will appear below.
3. Press the key to change the calculation formula.
4. Select a formula from the displayed list.
5. Press OK.
When a new formula is selected, the number of variables
below changes to match.
The following formulas are available:
K
1
A
1
+ K
2
A
2
Table 13 Multi wavelength setup options
Options Description
More For further Options
Recall measurement
data symbol Recall saved measurement data, wavelength scans or time courses, refer to section 5.3,
page 43 .
%Trans/Ext (%
Trans/Abs)
To switch to % transmittance, concentration or absorbance readings
λ Wavelength
To input the wavelength setting. Use the alphanumeric keypad to enter the reading wavelengths.
The entered wavelength must be in the range from 320–1100 nm.
Timer icon
This functions as a stopwatch. It helps to make sure that the steps of an analysis are correctly
timed (e. g. reaction times, wait times, etc., can be exactly specified). When the specified time
has elapsed, a sound is emitted. The use of the timer has no influence on the reading program.
Concentration Factor Multiplication factor for converting absorbance values into concentration values.
Concentration
Resolution
To select the number of decimal places.
Absorbance Formula Calculation basis for evaluating samples
Save as User Program To store the selected parameters as a User Program, refer to section 6.1, page 73 .
Recall measurement
data
Recall saved measurement data, wavelength scans or time courses, see section 5.3, page 43 .
Instrument Setup mode Basic data of the instrument, refer to section 5.2, page 27 .