6
•
Operation
Page 104
Diode Array/Multiple-Wavelength Detectors (VC-D11, VC-D12, VF-D11)
Operating Manual
Slit Width (only applicable to the VF detector)
You can select between two different slit widths:
•
Narrow
•
Wide
The following table shows the differences of these two slit widths.
Characteristic
Narrow
Wide
Spectral bandwidth
Smaller
Higher
Spectral resolution (the
ability of the detector to
distinguish between single
wavelengths)
Higher
Lower
Baseline noise
Higher
Lower
Usage
•
High concentrations
•
Analytes with narrow
absorption bands (such
as benzene)
•
Low concentrations
•
"Normal" applications
Figure 25: Effects of the slit width on baseline noise and spectral
resolution (upper line: wide slit, lower line: narrow slit)
The setting of the slit width affects all signal channels and the 3D field.
6.7.2.4
Selecting the Reference Wavelength and Bandwidth
Some disturbances on the measured signal from the sample can be
corrected by a measured reference signal, which is defined by the
parameters reference wavelength and reference bandwidth.
