Leica DM IRB Operating modes Dry/Immersion, Immersion objectives, To learn further objectives

Operating modes: Dry/Immersion

To ensure simple yet safe objective change, the objectives have to be classified in one of the following three categories:

1.Dry objectives (D) = all dry objectives with a short working distance (< = 3 mm).

2.Immersion objectives (I).

3.Combined objectives (C) = dry objectives with a long free working distance (> 3 mm), ob- jectives which can be used for scanning purposes as well through an oil layer.

By pressing the “CHANGE” key, select the display box for the operating mode.

Now select the valid objective category for the objective you are using (D, I, C) by turning the focus handwheel.

Ob j e c t i v e 1 : ↔
5xPHO D	EX I T

Learn mode: Objective data – Operating mode

Now all the objective parameters for the first objective have been learned, and the other objectives can be installed.

To learn further objectives:

Select objective no. 2 with the upper objective nosepiece key. Screw the objective with the next highest magnification into the nosepiece opening which is now furthest to the right.

By turning the handwheel, select the magnifi- cation display that matches the objective, as you did for the first objective. Proceed in the same way for setting the Phaco display, the IC prism display and the operating mode. Then repeat the setting procedures for the other objectives.

Nosepiece positions that are not occupied by an objective are given the code “--”. This has the effect that these positions are not travelled to in standard mode.

Conclude the Learn mode for the objective parameters by pressing the “CHANGE” key. “EXIT” flashes in the display; confirm with the “LEARN” key.

Before selecting the “Parfocality” option in the Learn mode, you should take the following steps:

–If you want to use a specimen holder on your stage, fit it now.

–Put a specimen on the stage.

–Switch to the highest magnification and focus the image of the specimen.

–Set the focus position with the key (→ Fig. 53b).

You can now begin with learning the parfocality.

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