BestScope BS-2070 User manual

Biological Microscope
BS-2070
Instruction Manual
This instruction manual is for lab biological microscope BS-2070 series. To insure safety and
obtain optimum performance and familiarize yourself fully with the use of this microscope .We
recommend that you read the manual thoroughly before operating the microscope ,Attain this manual
instruction in an easily accessible place near the microscope for the further reference.

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Safety notice
1. Transportation
As microscope is a precision instrument, handle with care,
avoiding impact or abrupt movement during transportation.
Do not push or pull the microscope during using, otherwise
the precision for image will be reduced.
1.1Holdthecurveandkeepthemicroscopeinbalance
1.2 Do not hold the focusing knob, eyepiece tubes and stage
as these parts are movable. Troubles maybe caused by such handles.
Do not make specimen or filters fall off.
2. Working Environment
As microscope is a precision instrument, improper using will make it unworkable or reduce its precision.
2.1 Do not expose the microscope in the sun directly
2.2 Temperature range is 0℃～40℃and the max. humidity is 85%
2.3 Avoid high temperature and humidification otherwise there will be fog or mold on the lens
2.4 Avoid violent vibration as the vibration will reduce the image’s quality
2.5 Place microscope on a stable plane and keep it in balance. Keep the environment breezy and cover the
microscope with the dust-cover
2.6 Do not place microscope in moist room to avoid short circuit. Please turn off the power supply as soon
as water drop in the microscope. If there are other things unsafe come into the microscope may cause short
circuit too, please stop using and contact with manufacturers
3. Focusing knob
Never turn the left and right focusing knob in the adverse
direction at the same time. Do not turn the coarse focusing
knob when the stage reaches max. position. These improper
operations will make focusing structure unworkable.
4. Clamp
The clamps fix the microscope firmly during transportation.
Please remove them before using.
5. Do not take the microscope apart as it will be damaged. Such operations might have bad effect on the
performance and make user get an electric shock or injured. Please contact with manufacturers if there is
any problem.
6. There is correct input voltage in the label on microscope.
Make sure the voltage in your position is right. Improper input
voltage may cause short circuit and fire. The microscope will
be damaged.
clamp

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Input voltage in the label: 220～240V 50/60Hz
Working voltage could be AC 110V, 120V, 220V, 230V or 240V
7. The bulb, fuse and electronic cord have been assembled already in the factory and please make sure to
use the spare parts of them supplied by the manufacturers. Improper bulb, fuse and electronic cord will
destroy microscope and cause fire. Please make sure to use PE electronic cord when using extra-long
electronic cord.
Spare bulbs: halogen bulb 12V/20W (or 12V/30W)
Spare fuse: 250V 1A delayed model, 5 ×20 mini type fuse
8. Never touch the surface of bulb with your hand directly. Please use gloves or cloth material when you
mount the bulb to avoid leaving fingerprints. Fingerprints or stains should be wiped off with a tissue
moistened with a small amount of alcohol. The fingerprints will etch on the bulb’s surface and make
brightness lower and life cycle shorter.
Please make sure the bulb’s touching points are Ok as it will not light or short circuit if the bulb’s touching
points are damaged. Insert the bulb’s legs into the bulb holder firmly. The bulb will go out if its legs have
not been inserted into the holder firmly. Such Operation may cause short circuit or smoking. At last, please
make sure if the collector has been mounted properly
9. Temperature for illumination
There will be high temperature when the bulb is lightened, never move the collector when the bulb is
lightened. Do not touch the bulb within 30 minutes after it has been gout out. Make sure the bulb has been
be cooling enough time (at least 30 minutes) to avoid scald.
Do not put fiber, papers and incendive things (eg. Gasoline, aether, methanol and ethanol) close to the bulb.
10. Make sure to turn off the power supply before assembling microscope, replacing bulb or fuse.
11. Using small amount of oil immersion is enough. The redundant oil will adhere to stage or condenser
and these will reduce microscope’s performance.
Get rid of the redundant oil or clean the lens by using aether or pure alcohol according to this instruction.
Pay attention during process as these things are incentive
The instruction you buy may not including some products mentioned in this instruction. Safety has been
considered during design while users still have the possibility to be injured and the instruction to be
damaged when improper operation made. Please pay much more attention to read this instruction carefully
before using and keep it properly to make sure it will be got when it is necessary.

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Installation and Operation
1. Structure and nomenclature
Eyepiece 10X,
diopter adjustable
Eyepiece fixture
screw
Nosepiece
Objectives
Specimen holder
Mechanical stage
Condenser with
auxiliary lens
Collector
Binocular head
Eye tubes fixture
Microscope body
Power supply
Lightness adjusting
knob switch screw
Fine focusing knob
Stage movement
knob (Y axis)
Stage movement
knob (X axis)

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2. Technical parameter and specification
1. Specification
1.1 Optical system: infinity optical system
1.2 Illumination: inserted transmitted illumination, 12V20W/30W halogen bulb (standard outfit) or LED
(available)
Input voltage: 220V～240V 50/60Hz
Voltage undulation: ±10%
Electric current: 0.4A
Fuse: 250V 1A delayed model, 5×20 mini type fuse 2pcs
1.3 Focusing adjustment: Division of fine focusing adjustment: 0.002mm
Fine focusing knob control range: stage will be up or down 0.2mm per circle
Coarse focusing knob control range: stage will be up or down 20mm
1.4 Mechanical stage: X-movement range: 54mm, Y-movement range: 78mm
1.5 Nosepiece: Roller bear quadruple nosepiece
1.6 Condenser: Abbe NA=1.25 with iris diaphragm
1.7 Eye tubes: Interpupillary range 55～75mm
1.8 Working environment: Temperature: 0℃～40℃
Humidity:max.85%,nodew
Altitude: within 2000m
Pollution: 2
Assembly: Ⅱ
2. Optical parameter
2.1 Objectives: Infinite plan achromatic objectives
Magnification N.A. Cover glass
thickness(mm)
W.D.
(mm)
Dry/Oil
4X 0.1 0.17 15.5 Dry
10X 0.25 0.17 5.02 Dry
40X 0.65 0.17 0.60 Dry
100X 1.25 0.17 0.13 Oil
2.2 Eyepiece: WF10X/20mm
Nomenclature
﹡Total magnification
Total magnification = Eyepiece’s magnification ×objective’s magnification
﹡Numerical aperture (N.A.)
N.A. value will affect resolution and image’s brightness, it is the leading parameter for objectives. N.A.=
n×sinα
n stands for refractive index of the medium between objective and specimen or condenser (air or oil
immersion)
αstands for half angle of max. aperture angle in the axis
The image will be sharper and brighter when the N.A. value is bigger
﹡Resolution
Resolution can be measured by the distance value from one point to another one which could be
distinguished on the object surface

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Resolution = λ / ( 2 ×N.A.)
λ stands for wavelength ( λ = 0.55μmm)
﹡Eyepiece view field
The max diameter measured when the diaphragm is open. 10X/20 means the magnification is 10X and
the max diameter of view field is 20mm
﹡Effective view field
Liner view field which is observed on the object surface
Effective view field = eyepiece view field / objective’s magnification
﹡Depth of field
Depth of field stands for depth of the space in which there is sharp image on the object surface. Depth
of field will be longer when the diaphragm reduces. Depth of field will be shorter when the N.A.
becomes bigger.
3. Configuration
Item Content Piece
1 Microscope’s body ( including stage, nosepiece, coaxial coarse
and fine focusing adjustment, bracket for condenser, adjusting
power supply, halogen bulb and normal collector)
1pc
2 Siedentopf binocular inclined at 30º(360ºrotatable) 1pc
3 Condenser ( with iris diaphragm, without auxiliary lens) 1pc
4
Objectives
( Infinite plan achromatic
objectives)
4X
1set
10X
40X
100X
5 WF10X eyepiece 2 pcs
6 Blue filter 1 set
7Electroniccord 1pc
8 Immersion oil 1 bottle
9Dustcover 1pc
10 Instruction and quality certificate 1 pc
11 Halogen bulb ( 12V20W) 2 pcs
12 Wrench 2.5, 1.5 1pc
Optional
Item Contents Piece
1 Collector with diaphragm
2 Condenser ( with iris diaphragm and auxiliary lens)
3 Dark field condenser
4 WF10X eyepiece with reticle
5 WF15X eyepiece (15mm)
6 Infinite plan achromatic objectives 20X, 60X
7 60X/0.85 achromatic objective
8 LED transmitted illumination
9 Siedentopf trinocular inclined at 30º(360ºrotatable)

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4. Assemblage
Please read the safety notice carefully before assembly and make the assembly according to the following
steps.
Tools: wrench (2 pcs)
4.1 There is correct input voltage in the label on microscope.
Make sure the voltage in your position is right. Improper input
voltage may cause short circuit and fire. The microscope will
be damaged.
Turn off the power supply (turn the switch to “O”) and insert
one end of the electronic cord (connector) into the entrance for
AC. Insert the other end of the electronic cord (pin) into the
grounded AC connector and make sure that the electronic cord
has been connected safely
﹡Please use the supplied electronic cord by manufacturer
﹡Please make sure to use PE electronic cord when using extra-long electroniccord.
﹡Pay attention that the microscope should be placed near AC connector and the AC connector is
touchable for users
4.2 The clamps fix the stage and focusing adjustment firmly
during transportation.
Handle the grooves beside collector and pull it out. Remove
the clamps by wrenches.
﹡Mechanical stage
There is one clamp fixing the mechanical stage in Y axis
direction. Remove the bolts and clamps.
﹡Focusing adjustment
Pull out the collector. The bracket is fixed by one clamp.
Please remove the bolts and clamps.
4.3 Mount the binocular head
Loosen the fixing screw in the eye tubes and insert the
binocular head into the eye tubes. Then tighten the screw.
4.4 Mount the blue filter
Take out the filter from the bottom of condenser and mount
it in the bracket then move the bracket into the condenser.

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4.5 Adjustment and replacement
4.5.1 Condenser
The condenser is mounted in the microscope before
shipment. Remove or replace the condenser according to the
following steps
4.5.1.1 Turn the lifting knob for condenser and make
the bracket in a suitable position
4.5.1.2 Loosen the screw in the left side of condenser
and take out the condenser. Mount the blue filter in the
bracket then move it into the bottom of the condenser. Make
the label in the condenser forward and move the condenser into the bracket. At last tighten the screw.
4.5.1.3 Turn the lifting knob of condenser and make the condenser to the highest position. The
image will be focused in the right place of object (center of light path) when the light
transit condenser. Move the condenser up and down a little to make the dispersion image
disappeared.
4.5.2 Objectives
The objectives have been mounted in the microscope before shipment
The objectives have been mounted in the microscope before shipment
Take off the specimen from the stage and make the stage lower when you replace the objectives.
Handle the objective with your two hands and remove it. Be carefully do not make it fall off.
4.5.3 Specimen clip
The clip has been mounted in the stage before shipment
Loosen two screws by wrenches supplied by manufacturer to remove the clip.
4.5.4 Eyepieces
10X eyepieces have been in the foam box before shipment. Insert the eyepiece into the eyepiece
tubes and tighten the fixing screws by wrench
Handle the eyepieces and replace them according to following picture
Left and right eyepiece should be replaced together when replacing to use 15X eyepiece to keep
the same magnification between left and right eye tubes
Notice: The 10X eyepiece should touch the end of eye tube
The “O” scale should be consistent with standard line when the eyepieces areinsertedinor
pulled out of the eye tubes. Handle the eyepiece cover and never handle the diopter adjusting
ring
4.5.5 Other attachments
Replace other attachments (eg, camera) according to the instruction
4.6 Replacement
4.6.1 Replacement for bulb

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4.6.1.1 Turn off the power supply (turn the switch to “O”) and pull out the connector
4.6.1.2 Wait for 30 minutes till the bulb is cooling
4.6.1.3 Handle the grooves in condenser and pull it out
4.6.1.4 Pull out the original bulb
4.6.1.5 Replace the bulb by gloves or cloth material then
insert the bulb into the socket entirely
4.6.1.6 Pull the condenser back to its original position
4.6.1.7 Connect the electronic cord to the power supply
4.6.2 Replacement for fuse
4.6.2.1 Turn off the power supply (turn the switch to “O”)
and pull out the connector
4.6.2.2 Open the cover for fuse by screwdriver
4.6.2.3 Mount the new fuse
4.6.2.4 Make sure that the voltage shown in the cover for
fuse is same to the working voltage
4.6.2.5 Mount the cover
5. Operation
5.1 Illumination
Turn on the power supply (turn the switch to “-“) then
the bulb will be on. The lightness can be adjusted by turning the
adjusting knob.
5.2 Interpupillary range
Adjust the siendentipf binocular to make sure that view
field in the right and left eyepiece is consistent. The point “·”
stands for the interpupillary distance
5.3 Put the slide in the stage and make the cover glass on it.
Make the clips clamp them entirely. Two slides can be put in the
stage in the same time
5.4 Focus by 10X objective
Put the 10X objective into the optic path and focus by turning coarse and fine focusing knob
﹡Turn the stage and focusing knob according to the direction shown in the picture
﹡There is no coarse focusing knob in one side of stage’s moving knob and in the other side there are
both coarse and fine focusing knob

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﹡Never turn the left and right focusing knob in the adverse direction at the same time. Never turn
the coarse focusing knob when the stage is in the end of removing range. Otherwise it will make
damage to the instrument
﹡It is difficult to do focusing if turning the focusing knob optionally. The specimen may be crushed
when 100X objective is used. Please read the instruction carefully to avoid making damage to the
cover glass or objective
5.4.1 Put the 10X or 4X objective into optic path
5.4.2 Remove the stage to the top by turning the coarse
focusing knob
5.4.3 Observe through the eyepiece and turn the coarse
focusing knob slowly to let the stage down and down till there is
sharp image
5.4.4 Turn the fine focusing knob to focus finely
Use the 10X objective or 4X objective firstly before
40X and 100X objective. Turn the fine focusing knob to focus finely
5.5 Adjusting the diopter for eyepieces
Adjust the diopter ring according to user’s diopter for left and
right eyes. This function could make use of advantages of objectives
fully. Meanwhile it also can be react as focusing
5.5.1 Put the 40X objective in the optic path and turn the
coarseandfinefocusingknobtodofocusing
5.5.2 Put the 10X objective (or 4X objective) in the optic path
5.5.3 Let your left eye observe through the left eyepiece and do
focusing by the diopter adjusting ring in left eyepiece
5.5.4 Repeat the above steps till sharp image can be observed
by left and right eyepiece at the same time.
5.6 Adjusting the upright position for condenser
Turn the lifting knob for condenser till it reaches the top position then fall it a little bit down. If there
is dispersion image in the view field, please remove the condenser a little bit of up and down to make
the dispersion image disappeared
5.7 Objectives
Turn the nosepiece to choose the objective and adjust the view field diaphragm and aperture
accordingly
5.8 Adjusting aperture diaphragm
Adjust the aperture diaphragm adjusting shaft for condenser till the position which stands for the
magnification of objective
﹡adjust the aperture diaphragm