Ratio; Ratio Method - thermo spectronic Helios Gamma Benutzerhandbuch

RATIO

Instrument and analysis parameters are set up on the RATIO METHOD page.
Move the cursor to the required parameter using the Up/Down Arrow keys.
Change the parameter by pressing the ENTER key.
Once the method has been set up press ZERO/BASE to zero the instrument for
the current method (see page 5) and press RUN. The spectrophotometer will
perform a measurement and display the result on the RATIO RESULTS page.
RATIO METHOD Page
MODE
ID
λ1
λ2
CORR. RATIO
CORR. λ
INTEGRATION
DELAY TIME
AUTOPRINT
CELL PROG
REF MODE
MODE
ABS
%T
ID
λ1, λ2, CORR. λ
The Deuterium lamp will be switched on if a wavelength less than 325.0 nm is
selected for a Gamma. The current data will be lost if the wavelength is changed.
CORR.RATIO
When set to NO, the formula Abs(λ1) / Abs(λ2) is used to calculate the ratio.
When corrected ratios are selected, the formula
(Abs(λ1) − Abs(λC) ) / ( Abs(λ2) − Abs(λC) ) is used instead.
INTEGRATION
This sets the integration time for which the result is measured.
The current data will be lost if the integration time is changed.
DELAY TIME
This sets the time between pressing RUN and the start of the measurement.
The range is from 0 to 99 minutes and 59 seconds.
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RATIO
* RATIO *
: ABS
:
: 550.0 nm
: 550.0 nm
: YES
: 550.0 nm
: 1 s
: 00:00
: OFF
: AUTO
: OFF
: Select from ABS or %T.
Selects Absorbance.
Selects % Transmittance.
: Enter a description using the TEXT ENTRY screen.
: Use the numeric key pad to enter the required
wavelength into the pop-up box. Press ENTER when
finished.
: Toggles between YES and NO with ENTER.
: Enter integration time in seconds.
: Set a time in the range 00.05 to 99.59,
using . to separate minutes and seconds.
English GD Issue 1 (08/2000)