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7. Startup
Fig. 55 Direct arc image and mirror image in target
position
(in reality, the image is less focused)
Centering the Hg 100 W and Xe 75 W
mercury lamps
• The adjustment window shows the direct im-
age of the arc and its mirror image. These are
generally not in alignment with one another.
• Focus the direct image with the collector (46.6).
• Use the adjusting buttons to pivot the arc’s
mirror image on the rear side of the lamp
housing (46.2, 46.4) to the side or completely
out of the beam path. The arc’s focused image
remains visible (Fig. 53).
• Use the adjusting buttons (46.1) and (46.5) to
place the direct arc image in the middle of the
centering plane, whereby the bright tip of the
arc, the focal spot, should lie slightly outside
of center (Fig. 54).
• Then pivot the arc’s mirror image with the ad-
justing knobs (46.2) and (46.4), and focus it us-
ing the reflector (46.3).
• Orient the mirror image symmetrically to the
direct image (Fig. 55). To do so, again use the
adjusting knobs (46.2) and (46.4).
The V-shaped irradiation of the direct image
and mirror image arcs can be superimposed.
Caution!
The bright tips of the arcs, the focal spot,
must never be projected onto each other, as
this results in a danger of explosion by over-
heating.
Fig. 54 Direct arc image in target position
(in reality, the image is less focused)
Fig. 53 Direct arc image focused but not centered
(in reality, the image is less focused)