Leica DM IRB manual Hg 50 W mercury lamp, Hg 100 W and Xe 75 W lamps

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).

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.

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