24
A12.0910
4-2-4 Center the Mercury Lamp Filament
★
Firstly set the main power switch to position “Ⅰ”,
and wait for 5~10 minutes, until the mercury arc
light stabilizes, and then center the filament.
(1) Install the centering objective into the nosepiece to
move the centering objective into light path, and turn
the frosted glass to the operating position. (See Fig.41)
(2) Move the fluorescence filter block B1 into the light
path.
(3) Open the field diaphragm and aperture diaphragm
to the largest.
(4) Adjust the condenser adjusting pole
①
, the vertical
adjusting screw
②
of mercury lamp, and the horizontal
adjusting screw
③
of mercury lamp to make the
filament image projected on the “+” scale of the
centering objective. (Fig. 41, 42a)
(5) Adjust the focusing screw
④
of reflecting lens and
the centering screw
⑤
, to make the reflected image
projected on the “+” scale of the centering objective.
(Fig. 41, 42b)
(6) Adjust the centering screw
⑤
to make the filament
image and reflected image symmetry to the “+” scale of
the centering objective. Adjust the focusing screw
④
to
make both images with same size. (Fig. 41, 42c)
(7) Adjust the vertical adjusting screw
②
of mercury
lamp, and the horizontal adjusting screw
③
of mercury
lamp to make the two images superposition to the center
of “+” scale. (Fig. 41, 42d)
(8) Screw down the centering objective, install the
fluorescence objective, and move the 10X objective
into the light path. With the fluorescence filter block B1,
set the slide on the stage, and rotate the coarse focusing
knob to find the image. Then rotate the fine focusing
knob to make the image be clear.
(9) Observe through eyepieces and adjust the condenser
adjusting pole
①
to make the field of view to reach the
normal brightness, then lock the knob.
Fig. 42
