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7. Start-up
• Then pivot the arc’s mirror image with the adjusting knobs (91.2) and (91.4) and focus it using the reflector (91.3).
Fig. 92
Direct arc image focused but not centered
(in reality, the image is less focused)
Fig. 93
Direct arc image in target position
(in reality, the image is less focused)
Fig. 94
Direct arc image and mirror image in target
position (in reality, the image is less focused)
• Use the adjusting knobs (91.2) and (91.4) to
orient the mirror image symmetrically to the
direct image (Fig. 94).
The V-shaped irradiation of the direct image
and mirror image arcs can be superimposed.
Caution!
The bright tips of the arcs, the focal spots,
must never be projected onto each other, as
this results in a danger of explosion by overheating.
Caution!
The structure of the arc can no longer be
made out clearly in lamps that have been in
service for a long time. The image and mirror
image can no longer be superimposed exactly. In this case, align both images.
• Using the collector, defocus the image with
the knob (91.6) until the arc image and mirror
image are no longer recognizable and the image is homogeneously illuminated.
• Replace the lamp adjustment reflector with
the original filter cube.
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