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14
Leica lamp housing and mercury burner
After installing the mercury burner, adjust it exactly as de-
scribed. Never let the bright tips of the electric arcs, the focal
spots, cross when projected.
Danger of explosion from overheating
Adjustment is also important to obtain a homogenous light
surface and good fluorescence.
When adjusting the mirror image of the arc, never
project it onto the electrodes for a longer period.
Danger of explosion from overheating!
Both electrodes can be faintly seen in the extension of the
symmetrical level of the arc.
̈Switch on the supply unit. Wait for 2–3 minutes.
• For the supply unit for 100W, you will hear a whistling sound.
̈Swing away the UV protection screen.
• You can work temporarily without the UV protection screen
only when making adjustments!
̈For the Leica MZ16 FA: Rotate the filter set into the beam
path using the F button on the
manual operation unit.
̈Draw crosshairs on a piece of paper and place it in the
middle of the illuminated circular area.
̈Select the lowest magnification.
• The arc is visible in the illuminated circular area.
It is positioned approximately 45° diagonally to the drawn
crosshairs (Fig. a).
̈Look into the oculars and focus the crosshairs.
̈With the naked eye, observe the arc on the paper and focus
it using the focusing knob (3) (Fig. a).
̈Move the arc using the positioning buttons (1 and 2) (Fig. b).
̈Focus the second arc (mirror image) using the button (6) and
position it symmetrically to the direct image using the knobs
(4 and 5) (Fig. c).
• For the 50W mercury burner, the arcs should contact each
other.
• For the 100W mercury burner, the arcs should cross.
̈Readjust the lamp field using the focusing knob (3).
• The light field should now be as large, round and uniformly
illuminated as possible.
̈Reposition the UV protection to protect the observer.
5. Adjusting the mercury burner