Metrohm 844 UV/VIS Compact IC - Manual (Page 87)

3.3 Settings
844 UV/VIS Compact IC / Gebrauchsanweisung 8.844.1051
75
A selection can be made from three different spectra, the absorption
spectrum, intensity spectrum and the zero spectrum. Please note that
each time you click on
Absorption , Intensity or Zero the function of the
<Update> button will be triggered.
<Update> The 844 measures the current intensity spect-
rum and sends it together with the last zero
spectrum to have been recorded to <IC Net>.
The absorption spectrum is recalculated from
these two spectra.
Absorption The absorption (with the units mAU) is given on
the y-axis as a function of the wavelength (x-
axis). The absorption values are calculated for
all measured wavelengths and shown as spect-
rum. The calculation formula for the absorption
value is shown here as an example for the
wavelength set for measuring channel 1:
akt
Int
zero
Int
Abs
1
1
log
λ
λ
=
where:
zero
Int
1 λ
The intensity measured when
recording the zero spectrum at the
wavelength set for measuring
channel 1.
akt
Int
1 λ
The actual intensity measured at
the wavelength set for measuring
channel 1.
If you are working with a reference channel (can
be activated on the subtab
Configuration
) the
formula is as follows: