Hach-Lange DR 3900 User Manual - Manual (Page 26)

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Standard programs
5.1.3 Main menu
A variety of modes may be selected from the Main Menu. The
following table briefly describes each menu option.
There is a toolbar on the right-hand side of the screen. Press to
activate the various functions.
Table 2 Main Menu options
Option Function
Stored Programs /
Barcode Programs
(HACH-LANGE programs)
Stored programs are pre-programmed methods that make use of HACH chemicals and
HACH-LANGE pipette tests.
The working procedures for HACH-LANGE tests are included in the test packs.
Further information, as well as illustrated, step-by-step process instructions for
analyses using HACH programs, are available on the website of the manufacturer.
User Programs
User programs make "made to measure analysis" possible:
• Users can program methods they have developed themselves
• Existing HACH and LANGE methods can be stored as user programs. The
HACH-LANGE tests can then be modified to suit the user's requirements.
Favorites List of methods/tests created by the user to suit his own requirements.
Single Wavelength
Single wavelength readings are:
Absorbance readings: The light absorbed by the sample is measured in absorbance units.
Transmittance reading (%): Measures the percent of the original light that passes through the
sample and reaches the detector.
Concentration readings: A concentration factor can be entered to enable the measured
absorbance values to be converted into concentration values.
Multi Wavelength
In the Multi Wavelength mode, absorbance (Abs) or percentage transmittance (%T) is
measured at up to four wavelengths and absorbance differences and absorbance relationships
are calculated. Simple conversions into concentrations can also be carried out.
Wavelength Scan
A wavelength scan shows how the light from a sample is absorbed over a defined wavelength
spectrum. This function can be used to determine the wavelength at which the maximum
absorbance value can be measured. The absorbance behavior is displayed graphically during
the scan.
Time course
The time scan records the absorbance or % transmittance at a wavelength over a defined
time.
System checks
The "System check" menu offers a number of options, including optical checks, output checks,
lamp history, instrument update, service time, settings for analytical quality assurance and
instrument backup.
Recall measurement data Stored data can be called up, filtered, sent and deleted.
Instrument Setup
In this mode, user-specific or method-specific settings can be entered: operator ID, sample ID,
date & time, sound, PC & printer, password, energy-saving mode and stored data.