Hach Lange DR 3900 User Manual page 100

Expanded programs
Options
More
Recall measurement
data symbol
%Trans/Ext (%
Trans/Abs)
λ
Wavelength
Timer icon
Concentration Factor
Concentration
Resolution
Absorbance Formula
Save as User Program
Recall measurement
data
Instrument Setup mode
100
Table 13 Multi wavelength setup options
Description
For further Options
Recall saved measurement data, wavelength scans or time courses, refer to
page 43.
To switch to % transmittance, concentration or absorbance readings
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.
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.
Multiplication factor for converting absorbance values into concentration values.
To select the number of decimal places.
Calculation basis for evaluating samples
To store the selected parameters as a User Program, refer to
Recall saved measurement data, wavelength scans or time courses, see
Basic data of the instrument, refer to
λ/ Absorbance Formula:
1. Press Absorbance Formula.
2. The formula selected in the top key determines the number
3. Press the key to change the calculation formula.
4. Select a formula from the displayed list.
5. Press OK.
The following formulas are available:
K
section 5.2, page
of wavelength and coefficient keys that will appear below.
When a new formula is selected, the number of variables
below changes to match.
A + K A
1 1 2 2
section 5.3,
section 6.1, page 73.
section 5.3, page
27.
43.