Olympus MX61A Manual - Page 41

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CENTRATION OF MERCURY/XENON BURNER

Turning the Burner ON

Set the main switch of the power supply unit for mercury burner to "

the burner is ignited.

# A discharge-type mercury or xenon burner may not turn on by the first try due to the characteristics of the burner.

If a burner does not turn on, set the main switch to "

to "

" (ON) again.

# To avoid shortening the service life of the burner, do not turn a burner off in less than 15 minutes after turning it on.

# When turning on a mercury burner that has been turned off, wait for about 10 minutes after it is turned off,

because it cannot be turned on unless the mercury vapor in the burner has cooled down and liquefied.

# If the lamp housing is opened while the burner is on, the power supply stops to ensure safety. In this case, set the

main switch to "

" (OFF) and wait for more than 10 minutes before retrying to turn it on again. Do not open the

lamp housing unless it has cooled down sufficiently.

# When resetting the burner hour counter, press and hold the reset button until the reading becomes "000.0".

Centering the Mercury Burner

}For centering of the xenon burner, refer to the instruction manual provided with the U-LH75XEAPO lamp housing.

Fig. 33

" (OFF), wait for 5 to 10 seconds and set the main switch

}Set the main switch to " " (ON) and wait until the arc image stabilizes (for

5 to 10 minutes after ignition) before proceeding to the centering.

1. Remove an objective to make an idle position on the revolving nose-

piece.

2. Touch the BF switch to select the BF light path.

3. Place a piece of white paper or similar object on the stage as the speci-

men, and move the stage approximately to the focus plane of the objec-

tive using the coarse and fine up/down adjustment switches..

4. Touch the AS open switch to fully open the aperture iris diaphragm.

5. Rotate the collector lens focus adjustment knob @ to project the arc

image on the white paper. (Fig. A)

If the arc image is not projected, rotate the burner centering knob ².

6. Rotate the lamp centering knob ² to move the arc image on the center

of the left (right) half of the field of view. (Fig. B)

7. Fit the tip of the Allen screwdriver into the mirror focus adjustment screw

³ (Fig. 34) on the rear of the lamp housing, and rotate the screw to focus

on the mirror arc image. (Fig. C)

8. Rotate the lamp centering knob ² so that the arc image and mirror arc

image are overlapped. (Fig. D)

}During observation, rotate the collector lens focus adjustment knob @ as

required to render the observed field of view uniform.

}It is not required to center the mercury burner further until the next time it

is replaced.

}If the collector lens focus adjustment knob @ is located to far to be

manipulated, fit the U-CLA extension handle (optional) shown below into

the knob @ and manipulate them together.

" (ON). The arc will stabilize in 3 to 5 minutes after

MX61A