Parameters; Wavelength; Time Constant - Ecom ECD2800 User Manual

6.1. Parameters

Here can be set basic parameters of the detector.

6.1.1. Wavelength

This screen is identical to the screen displayed after pressing key WL. Wavelength can be
set in the range of 190-800(600) nm. Keys with arrows left and right move with cursor and up and
down change value. Press ENTER for confirmation of selected wavelength, it will initiate
wavelength setup. Automatic zeroing (Autozero) is only performed when ENABLE is set in
Menu/Preferences/Signal/Autozero After WL Change.

6.1.2. Time Constant

Time constant represents level of signal filtering and is counted for level 63.5 %. Preset value
is used for both digital and analogue output. Slower (longer) time constant improves overall noise
of the detector output at the price of decreasing response speed. Low values decrease response
speed (response delay – time lag) and change the shape of peaks (they are wider and lower).
Time constant does not have an influence on the peak area size, even if low value widens and
lowers the peek.
M
ENU FLOW DIAGRAM
R
ECOMMENDED TIME CONSTANT SETTINGS
Time Constant
[s]
0.02
0.05
0.1
Peak half width for narrowest
expected peek in analysis
[s]
0.1
0.2
0.4
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ECD2800 / ECD2600