Function
Part
Measured absorbance level (absorbance units)
1
Maximum range (absorbance units)
2
Overrange
3
Signal to recorder (V)
4
The automatic overrange can be disabled/enabled in the
Setup
menu.
Display
Action
Step
Select menu
Automatic Overrange
, press
OK
.
1
Use the arrow keys to select
Yes
or
No
, then press
OK
.
2
Event mark
Event marks can be set, for example when the sample is injected, and are displayed as
spikes on the chart recorder. The spikes are 10% of the full scale of the chart recorder
which corresponds to 0.1 V.
Press
event mark
key to insert an event mark.
Setting averaging time
(filtering noise)
To filter the noise in the UV-signal, a moving average filter is used. The averaging time
is the time interval used for calculating the moving average of the absorbance signal.
A long averaging time will smooth out noise efficiently, but it will also distort the peaks.
Peaks narrower than the minimum peak width value may be distorted. Because of this
the averaging time should be as short as possible, see the table below. On delivery the
averaging time is set to 2.56 s.
Display
Action
Step
Select menu
Set Averaging Time
, press
OK
.
1
Monitor UVis-920 Operating Instructions 29055049 AD
47
5 Operation
5.8 Setup menu
