
V11.
Operating
the
Microscope
It
is
good
policy
to
keep
the
microscope irnmaculatel
y
clean.
Remove
visible
spots,
specks
of
dirt,
dust
or
grease
from
all
exposed
glass surfaces.
A
blower brush is a handy aid for
this
purpose.
How
to
put
the
microscope
in
operation:
1.
Switch
on
tungsten light source.
2.
Center
the
light bulb.
(See
page
17.
)
3.
Place
a
specimen slide
on
the mechanical
stage.
4.
Push in the light path selector
knob
on
the
binocular
tube
all the
way
(white
band;
100%
of
the light is directed towards
the
eyepieces).
5.
Make
interpupillary and dioptric adjustments.
{See
page
22.)
6.
Swing
in
the
desired
objective.
7.
Select the auxiliary lens system according
to
the
objective
in
use.
(See
page
18.
)
8.
Coarse
focus
with the coarse adjustment
knobs.
9.
Fine
focus
with
the
fine adjustment
knobs.
10.
Center
the
condenser.
(See
page
17.1
11.
Adjust
aperture
iris diaphragm
and
field iris diaphragm.
(See
page
21
.I
12.
Adjust
light
intensity.
A.
Electrical
Connection
1
)
Insert
the
two
plugs
of
the lamp cord
into
the lowvoltage outlet.
2)
Insert
the
plug
of
the
line
cord
into the line
cord
socket.
3)
Make
sure
that
the
voltage
adjustment
knob
is
set
at the nearer
end
to
you
(low
voltage),
then
push the main switch to supply
AC
pawer
to
the
instru-
ment.
When
power
is
on,
power pilot lamp
lights.
*
As
you
push
the mainswitch again, the light
is
off,
and
all
pawer is
cut
off.
4)
By vaising
the
voltage progressively,
you
can
ascertain that the bulb is
on.
Adjust light intensity
to
suit your requirement.
o
Line
Voltage
Adjustment
1
)
Voltage Selector Switch
At
thc
bottom
of
thc
base
is
a
voltage
selector
switch, which
can
be
turned
with
a
coin,
to
correspond
with
the
voltage
of
main
supply
(1
10V,
120V,
220V
or
240V).
2)
Line
Voltage
Adjustment Screw
Thc
minimum voltage required for light source
can
be
varied
by
means
uf
the
line
voltage adjustment
screw
provided
at
the
side
of
microscope
base
Ion
your left-hand
side),
since
a
silicon controlled rectifier
ISCR)
is
adopted in
rhe
dimmer circuitry.
If
the
bulb is dirnmly lit
upon
switching
on
light source,
the
line voltage is
proper, and
you
have
only
to manipulate the voltage adjustment knob
in
order
to
obtain
optimum
light
intensity. However,
in
case
the
bulb
does
not
light
at
all
or
does
light
up
bright immediately after switching
on,
rotate gradually
the
line
voltage
adjustment
screw
with
a
coin,
until the bulb dims.
NOTE:
For
low voltage adjustment
(0-9.5VJ
after dimming
the
bulb,
use
the
voltage
adjustment knob.
Voltmeter
Reading
As
the
voltage
adjustment
knob
IS
moved along
the
slit, the
red
zone
shifts
as
shown
schematically.
The left-side
picture
indicates
4V,
and
the
right-side picture
8V.
Avoid
prolonged
use
of
the
light
source
at
readingsin the red
zone.
4-
16
8
-8