Olympus U-25ND25 Manuale di istruzioni - Pagina 16

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Fig. 3

Centering the Mercury Burner

}Set the main switch to " I " (ON) and wait for 5 to 10 minutes until the arc

image stabilizes before proceeding to the mercury burner centering.

1. Engage the shutter in the light path by pressing the RSHT button on the

hand switch.

2. Engage the B or IB excitation fluorescence mirror unit in the light path (If

these mirror units are not available, engage another fluorescence mirror

unit in the light path. Also note that, when using an U excitation fluores-

cence mirror unit, be always sure to observe the specimen image through

a UV cut plate.)

3. Engage the 10X objective in the light path by pressing the objective

button, place the U-CST centering target on the stage, and adjust the

centering of the center of crosslines on white surface of the U-CST with

respect to the center of field of view.

4. Engage the empty place (the objective cap should be removed) in the

light path.

5. Pull out the aperture iris diaphragm knob @ (to minimize it) and push in

the field iris diaphragm knob ² (to maximize it).

6. Release the shutter by pressing the RSHT button.

7. Project the arc image on the U-CST by turning the collector lens focusing

knob ³. (A)

If the arc image is not projected, adjust the burner centering knobs |.

8. Bring the arc image on the center of the left (or right) half of the field by

turning the burner centering knobs |. (B)

9. Fit the Allen screwdriver in the mirror focusing screw (ƒ in Fig. 4) on the

rear of the lamp housing and adjust to bring the mirror arc image in

focus. (C)

10.

Overlay the arc image with the mirror arc image by turning the burner

centering knobs |. (D)

}During observation, adjust the collector lens focusing knob ³ so that the

observed field is uniform.

}Hereafter, the mercury burner centering need not be adjusted until the

next time the mercury burner is replaced.

(Fig. 3)