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32
7. Start-up
Centering the Hg 50 W* Mercury Lamp
• On the paper, you see the direct arc image
and the mirror image, which in most cases are
not aligned
• Focus the direct image with the collector
(30.6)
• Use the adjusting buttons on the rear side of
the lamp housing (30.2, 30.4) to pivot the arc’s
mirror image to the side or completely out of
the beam path; the lamp filament’s focused
image remains visible (fig. 31)
• Use the adjusting buttons (30.1) and (30.5) to
place the direct arc image to the right or left
of an imaginary center line of the centering
plane (fig. 32).
• Then pivot the arc’s mirror image with the ad-
justing knobs (30.2 and 4) and focus it using
the reflector (30.3)
• Use the adjusting knobs (30.2 and 4) to orient
the mirror image symmetrically to the direct
image (fig. 33)
• Defocus the image with the collector knob
(30.6) until the arc image and mirror image are
no longer recognizable and the image is
homogeneously illuminated
Fig. 31 Direct arc image focused but decentered
(in reality, the image is less focused)
Fig. 32 Direct arc image in target position
(in reality, the image is less focused)
Fig. 33 Direct arc image and mirror image in target
position (in reality, the image is less focused)