 |  | Arc lamps in mercury and xenon burners work under high vacuum and high temperatures. These safety steps are highly recommended.
- Wear safety glasses.
- After switching the unit off do NOT switch power supply back on again before the burner has been permitted to cool down completely (typically 20 min.).
- Wear lint-free gloves or use lens tissue when handling the bare bulb.
- Let the burner cool completely before removing the bulb.
- Unplug the power supply.
PROCEDURE
- Move collector lens away from bulb (knob on lamp housing) or remove lens entirely. Separate socket from lamp housing (retaining screw).
- Remove copper wire from post (thumb screw) then pull bulb upwards from socket (loosen lug nut at base; special wrench). Remove heat sink (silver cap on bulb; set screw).
- Reverse steps 1-2 to reinstall new bulb, being careful not to put strain or stress on bulb when tightening fittings. (For 50W HBO burners make sure flat sealed surface is facing to side.)
- To align arc, remove an objective, rotate empty space into viewing position and place a white card flat on stage, revealing real and mirror arc images. Focus images using collector lens and align (see diagram) using centering screws on lamp housing.
- Defocus images to evenly illuminate field; reinstall objective.
TIPS
- For greater stability, run for one hour before using.
- Never switch high pressure burners on and off quickly.
Send us your ideas for future issues of The Zeiss Corner. And for all your microscopy needs, contact Zeiss today:
Carl Zeiss MicroImaging
One Zeiss Drive
Thornwood, NY 10594
Call: 800-233-2343
Fax: 914-681-7446
Email:  micro@zeiss.com
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