Metrohm 844 UV/VIS Compact IC - Manual (Page 86)

Table of contents
T int, ms Integration time.
Entry range: 10 ... 254 ms
T out, s Measuring time per data point.
Entry range: 0.05 ... 2.00 s
Data rate Effective measuring time per data point. The
Data rate is the particular whole number multiple
of the value
T int
that is closest to the value
T
out .
The measurement of a data point is explained by using an
example:
Set values:
T int = 15 ms, T out = 0.1 s
The calculated Data rate is 105 ms (the particular multiple of T
int that is closest to the value T out ; in our example 7 times 15
ms). This means that the integration will be carried out 7 times
(each time for 15 ms) and then averaged to give a data point.
Optimizes T int and adjusts the VIS lamp.
It should be done
• after exchanging a lamp (UV or VIS)
• if parts of the intensity spectrum are in the
overload ( > 60'000 , peaks cut)
• if the maximum of the intensity spectrum
of dist. water is too low (below 33'000)
Before clicking , the flow-through
cell should be rinsed and filled with dist.
water. There must be no air bubbles in the
flow-trough cell when clicking .
Operating hours Operating hours of the lamps.
UV lamp, h
Display of the operating hours of the
UV lamp.
Set operating hours of the UV lamp
to 0. Click it after replacing the UV
lamp.
VIS lamp, h
Display of the operating hours of the
VIS lamp.
Set operating hours of the VIS
lamp to 0. Click it after replacing the
VIS lamp.
3.3.3 Spectrum window
The SPECTRUM WINDOW can be opened with a right-hand mouse-
click on the 844 icon and then selecting the menu item Spectrum
window , or via the button on the subtab Manual/Detector .