Operation 3
Monitor UV-900 User Manual 18-1120-05 Edition AF
21
3.10 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. Pe aks narrower than t he minimum peak width
value may be distorted. Because of this the averagin g ti me should be as short
as possible, see the table below. On delivery t he av eragin g time is set to 2.5 6 s.
1 Select menu
Set Averaging Time
, press
OK
.
2 Set the value, press
OK
. Use the fixed
values
between 5.12 and 0.08 s.
When monitoring more than one wavelength, the recommended
averaging time is a minimum of 1.28 s.
In UNICORN t he av er aging ti me is set with the i nstruction
AveragingTime
in
S
ystem Control:Manual:Alarm&Mon
.
Set Averaging Time
(2.56s) <2.56>
Averaging time (s) Time constant (s)
(approximate)
Min. peak width
at half height (s)
5.12 2.0 32
2.56 1.0 16
1.28 0.5 8.0
0.64 0.2 3.2
0.32 0.1 1.6
0.16 0.05 0.8
0.08 0.03 0.5
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