thermo spectronic Helios Gamma Benutzerhandbuch Seite 43

WAVELENGTH CALIBRATION Page ( Gamma only )
* WAVELENGTH CALIBRATION *
CALIBRATION : USING D2 LAMP
WARNING: DO NOT ATTEMPT TO RECALIBRATE THE INSTRUMENT UNLESS
YOU ARE ABSOLUTELY SURE YOU NEED TO DO SO. IF IN ANY
DOUBT CONTACT THERMO SPECTRONIC APPROVED
CUSTOMER SUPPORT.
ENSURE THE SAMPLE BEAM IS CLEAR BEFORE ATTEMPTING ANY
WAVELENGTH CALIBRATION.
This option will optimise the wavelength calibration of the instrument by
measuring the Deuterium lamp emission line at 656.1nm and fitting the
calibration accordingly. It should only be attempted if for any reason the
instrument no longer achieves its quoted wavelength accuracy specification.
The calibration will take at least 10 minutes.
Ensure Deuterium Lamp is ON.
Ensure instrument is fully warmed up and the beams are clear.
From WAVELENGTH CALIBRATION page press CALIBRATE.
Once calibration is complete switch the instrument OFF.
Switch instrument and Deuterium lamp ON and allow to warm up.
Run a new Default Baseline.
OPTICAL INITIALISATION Page
This page is used to reset the instrument and define its initialisation and default
baseline. These procedures ensure the optimum performance of the
spectrophotometer.
INITIALISATION TYPE :
OPTICS - During initialisation the instrument performs some simple hardware
checks, calculates various data tables and measures the dark current. The filter
wheel is then initialised before the instrument drives to the default wavelength
and performs an autozero.
BASELINE - This re-measures the default baseline. Ensure that both lamps are
on and that the spectrophotometer is fully warmed up. This process will take
about one hour.
The default baseline should be re-measured whenever one of the source lamps is
changed or if the instrument is working at temperatures significantly different
°
from 25 C, or if the wavelength calibration is altered.
INITIALISE WITH D2 :
( Gamma only )
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SETUP
From this page the Wavelength calibration of
the instrument can be adjusted.
When selected this displays a pop-up menu to
choose between initialisation of optics or baseline.
This sets the instrument to initialise with or without
the Deuterium lamp on. If set to ON then the
instrument will automatically strike the Deuterium
lamp during initialisation.
English GD Issue 1a (12/2000)