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.
<Optimize> 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 <Optimize> , 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 <Optimize> .
Operating hours Operating hours of the lamps.
UV lamp, h
Display of the operating hours of the
UV lamp.
<Reset 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.
<Reset 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 .