3B Scientific BS-200 User Manual
3B SCIENTIFIC® PHYSICS
Laboratory Microscope BS-200 1005455
Instruction Manual
08/13 ALF
1. Safety notes
• For power supply use only electrical sockets
with ground contact.
Caution! The Stirling engine becomes hot during
use. Risk of burns!
• Do not touch the lamp during or immediately
after use.
2. Description, technical data
The laboratory microscope BS-200 allows twodimensional viewing of objects (thin sections of
plant or animal specimen) in 40x to 1000x magnification.
Stand: Robust, all metal stand with arm permanently connected to the base. Focussing by
means of separate knobs for coarse and fine
adjustment located on either side of the stand
and operated by rack and pinion drive with ball
bearings and retaining lever, adjustable stopper
for protecting the object slides and objective
Tube: Binocular at 30° angle, rotatable through
360°, viewing distance adjustable between 50
and 76 mm, ±5 dioptric compensation for both
eyepieces
Eyepiece: Pair of eyepieces PL10x 18 mm with
infinite optics and “high eye point”
Objectives: Inverted objective revolver with
plan achromatic infinite objectives 4x, 10x, 40xS
und 100xS Oil
Magnification: 40x, 100x, 400x, 1000x
Object stage: x-y c ross tab le, 150 x 140 mm
with object guide and coaxial adjustment knobs
perpendicular to the object stage, adjustment
range 50 x 76 mm
Illumination: Adjustable 6 V, 20 W halogen
lamp, built-in transformer for 90 to 240 V mains
voltage
Condenser: Condenser NA1.25, iris diaphragm,
focussed via rack and pinion drive
Dimensions: 320 x 200 x 400 mm³ approx.
Weight: 6.7 kg approx.
1 Eyepiece
2 Tube
3 Revolver with objectives
4 Object guide
5 Object stage
6 Condenser control (not visible)
7 Condensor with iris diaphragm
8 Lamp housing
9 Illumination control (not visible)
10 Base
11 Lamp compartment
12 Mains switch
13 Coarse and fine movement con-
trols with holding brake
14 Condensor lock screw
15 Coaxial movement control for the
specimen stage
16 Stand
17 Lock screw for object stage
18 Head lock screw
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3. Unpacking and assembly
The microscope is packed in a molded styrofoam container.
• Take the container out of the carton remove
the tape and carefully lift the top half off the
container. Be careful not to let the optical
items (objectives and eyepieces) drop down.
• To avoid condensation on the optical com-
ponents, leave the microscope in the original
packing to allow it to adjust to room temperature.
• Using both hands (one around the pillar and
one around the base), lift the microscope
from the container and put it on a stable
desk.
• The objectives will be found within individual
protective vials. Install the objectives into the
microscope nosepiece from the lowest magnification to the highest, in a clockwise direction from the rear.
• Insert the condenser. First raise the object
stage to its highest position, insert the condenser into its holder and secure it in place
with the fixing screw.
• Put the head onto the top of the stand and
tighten the head-lock-screw. Insert the eyepieces into the tube.
4. Operation
4.1 General information
• Set the microscope on a level table.
• Place the object to be observed in the centre
of the specimen stage and clamp it to the
object guide.
• Connect the mains cable to the net and turn
on the switch to get the object illuminated.
• Make certain that the specimen is centered
over the opening in the stage.
• To obtain a high contrast, adjust the back-
ground illumination by means of the iris diaphragm and the variable illumination control.
• Adjust the interpupillary distance so that one
circle of light can be seen.
• Make the necessary eyepiece dioptre ad-
justments to suit your eyes.
• Rotate the nosepiece until the objective with
the lowest magnification is pointed at the
specimen. There is a definite “click” when
each objective is lined up properly.
NOTE: It is best to begin with the lowest power
objective. This is important to reveal general
structural details with the largest field of view
first. Than you may increase the magnification
as needed to reveal small details. When 100x
(oil) objective is chosen, objective oil must be
dripped onto the slide.
To determine the magnification at which you are
viewing a specimen, multiply the power of the
eyepiece by the power of the objective.
• Adjust the holding brake to give a suitable
degree of tightness in the focusing mechanism.
• Adjust the coarse-focusing-knob which
moves the stage up until the specimen is focused. Be careful that the objective does not
make contact with the slide at any time. This
may cause damage to the objective and/or
crack your slide.
• Adjust the fine-focusing-knob to get the im-
age more sharp and more clear.
• When using colour filters, place them di-
rectly on the lamp housing.
• Use the knobs of the mechanical stage to
move the slide side-, back- and forwards.
The vernier provides acc urate loc ation of the
specimen area.
• Always turn off the light immediately after
use.
• Be careful not to spill any liquids on the mi-
croscope.
• Do not mishandle or impose unnecessary
force on the microscope.
• Do not wipe the optics with your hands.
• Do not attempt to service the microscope
yourself.
4.2 Changing the lamp and fuse
4.2.1 Changing the lamp
• Turn off the power switch, unplug the mains
plug and let the lamp cool down to avoid being burnt.
• Pull the lamp socket out of the lamp com-
partment.
• In order to change the halogen lamp, use a
cloth or something similar. Do not touch the
lamp with your fingers.
• Lift out the halogen lamp and replace it with
a new one.
• Close the lamp compartment again.
4.2.2 Changing the fuse
• Turn off the power switch and unplug the
mains plug.
• Unscrew the fuse holder on the back of the
stand base with a screwdriver.
• Replace the fuse and reinsert the holder in
its socket.
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