Hach DR 3900 Manual Básico Del Usuario página 14

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 are pre-programmed methods that make
Stored
use of HACH chemicals and vial tests.
Programs /
Further information, as well as illustrated, step-by-step pro-
Barcode
cess instructions for analyses using HACH programs, are
Programs
available on the website of the manufacturer.
User programs make "made to measure analysis" possible:
• Users can program methods they have
developed themselves
User Programs
• Existing HACH methods can be stored as user
programs.
List of methods/tests created by the user to suit his own
Favorites
requirements.
English 14
Table 2 Main Menu options
Option Function
Single wavelength readings are:
Absorbance readings: The light absorbed by the sample is
measured in absorbance units.
Transmittance reading (%): Measures the percent of the
Single
original light that passes through the sample and reaches the
Wavelength
detector.
Concentration readings: A concentration factor can be
entered to enable the measured absorbance values to be
converted into concentration values.
In the Multi Wavelength mode, absorbance (Abs) or
percentage transmittance (%T) is measured at up to four
Multi
wavelengths and absorbance differences and absorbance
Wavelength
relationships are calculated. Simple conversions into
concentrations can also be carried out.
A wavelength scan shows how the light from a sample is
absorbed over a defined wavelength spectrum. This function
Wavelength
can be used to determine the wavelength at which the maxi-
Scan
mum absorbance value can be measured. The absorbance
behavior is displayed graphically during the scan.
The time scan records the absorbance or % transmittance at
Time course
a wavelength over a defined time.
The "System check" menu offers a number of options,
including optical checks, output checks, lamp history,
System checks
instrument update, service time, settings for analytical
quality assurance and instrument backup.
Recall
measurement Stored data can be called up, filtered, sent and deleted.
data
In this mode, user-specific or method-specific settings can be
Instrument
entered: operator ID, sample ID, date & time, sound, PC &
Setup
printer, password, energy-saving mode and stored data.