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Hg 100 W and Xe 75 W lamps
Using the centring buttons (70.1, 70.5) move the
direct image of the arc to the middle of the
centration area, with the bright tip of the arc, the
focal spot of the cathode, just off centre.
Then focus the reflection (70.3) and, using the
centring buttons of the reflector adjustment,
move the reflection until it is symmetrical with
the direct image (Fig. 71a, b, c).
The V-shaped emissions of the arcs of the direct
image and the reflection can be superimposed.
Caution:
The bright tip of the light arcs, the focal spots
of the cathode, must never be projected on
top of one another, as there is then a risk of
explosion due to overheating.
Replace spent burners in good time and
dispose of in an environmentally compatible
way.
Open lamphousing only after cooling and
disconnection from the mains.
Wear gloves and mask if using Xe lamps.
Hg lamps will reach their full intensity only
after a few minutes, they do not ignite when
hot.
n. b.:
Never look straight into the light path!
Remember the risk of glare when switching
to the BF or Smith reflector!
Centration of Xe or Hg gas discharge lamps
Move the reflection of the discharge arc to the
side or entirely out of the light path by adjusting
the centring screws on the back of the lamp-
housing (70.2, 70.3, 70.4).
Focus the direct image of the arc with the
collector adjustment (70.6).
Caution:
Use the neutral density filter to reduce the
intensity of the discharge arc image on the
centration areas due to the risk of glare
damaging the eyes.
Centre the arc images as follows:
Hg 50 W mercury lamp
Using the centring buttons (70.1, 70.5) move the
direct image of the arc to the right or left of an
imaginary line through the middle of the
centration area. Then focus the reflection (70.3)
and, using the centring buttons of the mirror
adjustment (70.2, 70.4), move the reflection until
it is symmetrical with the direct image (Fig. 71c).