Method II Fig, Centering method I Centering method

8. Operation

•Switch off the analyzer, the 1.6x tube lens and the Bertrand lens.

•Reduce the aperture diaphragm so that it is very small.

•Insert both objective centering keys above the objectives that need to be centered.

•Focus the specimen.

Two resembling methods can be used for cen- tering objectives:

Method I (Fig. 64)

•Turn the specimen stage and note the position of the specimen that does not move in a circu- lar path. This position of the specimen corre- sponds to the mechanical axis of rotation of the specimen stage.

•Now move the marked specimen position by shifting the two centering keys to the center of the cross-hairs.

•Turn the specimen stage and refine the cen- tering as needed.

Fig. 64 Centering method I Fig. 65 Centering method II

Method II (Fig. 65)

•Move the marked specimen position (65a) into the center of the M cross-hairs.

•Turn the specimen stage until the specimen position is as far from the center of the M cross-hairs as possible (Position A, Fig. 65b). In extreme cases, point A (= maximum devia- tion of the specimen position) can also be lo- cated outside of the field of view.

•Move the image by turning the centering key until position A of the specimen is located in the center (= Pos. B) between pos. A and the center of the M cross-hairs (65c).

•Move position A of the specimen to M and check to see whether A remains in M when the stage is rotated (65d). If necessary, repeat the centering procedure.

The objective centering procedure needs to be repeated for each objective. This ensures that the objectives retain their approximate center- ing settings when they are removed for clean- ing, or other such procedures, and then rein- serted into the same holes. If the coarse drive or the height adjustment device is used to change the height of the specimen stage (for example, when viewing thick specimens) the centering precision for all of the objectives may be reduced slightly.

M		M	M	M
A		B		B
A		A		A
a	b	c		d

DM4500P, DM5000B, DM4000M specifications

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