wtw PhotoLab Spektral, Operating Instructions Manual

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11 Correction functions
→
In the correction functions menu, call up the refer-
ence transmission menu item.
The following display appears:
The function, reference transmission is active and
appears in the special functions menu.
→
To measure the reference transmission, call up the
special functions submenu in the setup menu.
reference transmission function:
→
Select the menu item, On
→
Confirm with .
→
Call up the reference transmission menu item.
→
Call up the measure ref. trm. menu item.
11.3 Reference transmission
Each transmission measurement is made against the
basic transmission stored in the meter.
When measuring the reference transmission, this val-
ue is ignored and the value measured as the reference
transmission is used instead.
The reference transmission function is not active
when delivered.
The measured reference transmission value remains
stored until
●
the photometer is switched off
●
the cell type (10 mm, 20 mm, 50 mm, round) is
changed
●
the wavelength is changed
●
the measuring mode, reference transmission, is
left
●
it is manually erased using the erase ref. transmis-
sion function
●
the function, reference transmission, is switched
off.
The erase ref. trm. menu item first appears
after at least one reference absorbance has
been measured.