Agilent Technologies 1100 Series Reference Manual page 179

Figure 42 Mechanical Layout of the Optical Unit
Lamp
The light source for the UV wavelength range is a deuterium lamp. As a result of plasma
discharge in a low pressure deuterium gas, the lamp emits light over the 190 to 600 nm
wavelength range.
Source Lens
The source lens receives the light from the deuterium lamp and focuses it onto the
Assembly
entrance slit.
Entrance Slit
The entrance slit assembly has an exchangeable slit. The standard one has a 1-mm slit.
Assembly
For replacement and calibration purposes to optimize the alignment, a slit with a hole is
needed.
Filter Assembly
The filter assembly is electromechanically actuated. During wavelength
calibrations it moves into the lightpath.
The filter assembly has two filters installed and is processor-controlled.
OPENnothing in lightpath
CUTOFFcut off filter in lightpath at λ > 370 nm
HOLMIUMholmium oxide filter for wavelength check.
A photo sensor determines the correct position.
1100 Series Variable Wavelength Detector Reference Manual 177
Introduction to the Variable Wavelength Dector
6