BestScope BS-2026 Series User manual

Version No.: V1.0
BS-2026 Series Biological
Microscope
Instruction Manual
BS-2026M BS-2026B BS-2026BD1
This instruction manual is for the operation guide, troubleshooting and
maintenance to the BS-2026 series biological microscope. Please study this manual
thoroughly before operating, and keep it with the instrument. The manufacturer
reserves the rights to the modifications by technology development. On the basis
of operation ensured, technical specifications may be subject to changes without
notice.

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Contents BS-2026 Series
Before Use
1. C o m p o n e n t s ………………………………………………………………………..……...1
2. A s s e m b l i n g …. . . …….……………………………………………………………………...4
2- 1 A s s e m b l i n g S c h e m e …………………………………. . . . …………………………….4
2-2 As semb lin g Ste ps …… …………… …… … ..………………..….…………………5
3 . O p e r a t i o n s …………………………………………………………………………….……. 7
3-1S e t I l l u m i n a t i o n … … … … .………….………………………………………..7
3-2 Place t he Specimen Slide ..……….…………….…………………………...7
3-3 A d j u st t h e F o c us …………………………………...…….…………..…..... 7
3-4 Adjust the Focusing Tension …......……………………………………….….7
3-5 Aperture Diaphragm …………………………………………………………………………………………………8
3-6 Use the Oil Objective (100X)……………………………………………………………………………….….8
3-7 Use binocular head /trinocular head （ Optional ） ……………………..........9
3-8 Use mechanical platforms （ Optional ） …………………………………………………………………..9
3-9 S t o r e t h e P o w e r C o r d …………………………………………………………………..10
4. T r o u b l e s h o o t i n g …………………………………………………………………….……...11

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Before Use BS-2026 Series
1. Operation Notice
1. As the microscope is a high precision
instrument, always operate it with care, and avoid
physical vibrations.
2. Do not expose the microscope in the sun
directly, either not in the high temperature, damp,
dust or acute shake. Make sure the worktable is
flat and horizontal.
3. When moving the microscope, keep holding the
rear cover hand clasp①and the front end of
microscope body②with each hand. Handle with
care. (See Fig. 1)
★It will damage the microscope by holding the
stage, focusing knob or head when moving.
4. Connect the microscope to the ground to avoid
lightning strike.
5. For safety, make sure the power knob① is
rotated counterclockwise to the minimum before
replacing the bulb, and wait until the bulb and
base cool down completely (see Fig. 2).
★Bulb selected only: single 5050 LED
6. Wide voltage range is supported as 100~240V.
Additional transformer is not necessary. Make
sure the power supply voltage is in this range.
7. Use the special wire supplied by our company.
Fig.1
Fig.2

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BS-2026 Series
2. Maintenance
1. Wipe the lens gently with a soft tissue. Carefully wipe off the oil marks and fingerprints
on the lens surfaces with a tissue moistened with a small amount of 3:7 mixture of alcohol and
ether or dimethylbenzene.
★As the alcohol and ether is flammable, don’t place these chemical near to fire or fire
source. For example, when turning on or turning off the electrical device, please use these
chemical in a ventilated place.
2. Don’t use organic solution to wipe the surfaces of the other components. Please use the
neutral detergent if necessary.
3. If the microscope is damped by liquid when using, please power it off immediately and
wipe it dry.
4. Never disassemble the microscope, otherwise the performance will be affected or the
instrument will be damaged.
5. After using, cover the microscope with a dust cover.
3. Safety Sign
Sign
Signification
Study the instructions before use. Unsuitable operation would lead to
person hurt or instrument faulty.

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1. Components BS-2026 Series
BS-2026M
Eyepiece
Fine Focusing
Knob
Coarse
Focusing Knob
Body Group
Objective
Stage
Condenser
Lock Screw
Indicator Light
Light Adjustment Knob
Nosepiece
Monocular Head

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BS-2026 Series
BS-2026B
Objective
Stage
Illuminator
Fine Focusing Knob
Coarse Focusing Knob
Tension
Adjustment
Ring
Body
Group
Binocular Head
Eyepiece

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BS-2026 Series
BS-2026T
Eyepiece
Trinocular Head
Fine Focusing
Knob
Coarse Focusing
Knob
Body Group
Objective
Stage
Condenser
Lock Screw
Indicator
Light
Light Adjustment Knob
Nosepiece
Vertical
Adjustment
Knob
Horizontal
Adjustment
Knob

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2. Assembling BS-2026 Series
2-1 Assembling Scheme
Following is the Assembling Scheme, and the numbers denote the assembling order.
★Before assembling, make sure there is no dust, dirt or other materials which will disturb it.
Assemble carefully and do not scrap any part or touch the glass surface.
Eyepiece
Objective
Power Cord

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BS-2026 Series
2-2 Assembling Steps
2-2-1 Assemble the Objective
1. Rotate the coarse focusing knob①to lower the
stage to a suitable position (see Fig.3).
2.Then install the objectives into the nosepiece②
from the lowest magnification to the highest in
clockwisedirection.
★When operating, first use the low magnification
objective (4X or 10X) to search for specimen and
focus, and then replace with high magnification
objective to observe.
★When replacing the objective, rotate the
objective nosepiece until it sounds “click”, to
make sure the objective wanted is in the center of
optical path.
2-2-2 Assemble the Eyepiece
1. Take down the cover of eyepiece tube①.
2. Insert the eyepiece② into the eyepiece tube,
until it touches the surface.
3. Tighten eyepiece with M2.5 inner hexagon
lock-screw③(see Fig.4).
2-2-3 Connect the Power Cord
★Don’t use strong force when the power cord is
bended or twisted, otherwise it will be damaged.
1. Make sure the light adjustment knob is at
“O”(OFF) before connecting the power cord.
2. Insert the connector①of into the power
socket②, and make sure it connects well (Fig.5).
3. Insert the other connector into the socket of
power supply, and make sure it connects well.
4.There are rechargeable batteries at the bottom of
the microscope. Open the battery box to replace
the battery (see Fig.6).
Fig.3
Fig.4
Fig.5
Fig.5

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BS-2026 Series
★Use the special wire supplied by our company.
If it’s lost or damaged, choose one in the same
specifications.
★Wide voltage range is supported as 100~240V.
★Connect the power cord appropriately to make
sure the instrument is connected to ground.
Fig.6

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3. Operations BS-2026 Series
3-1 Set Illumination
1. Put through the power and adjust the light
adjustment knob①until the illumination is
comfortable for observation. Rotate the light
adjustment knob in clockwise to raise the voltage
and brightness. Rotate the light adjustment knob
in counterclockwise to lower the voltage and
brightness (see Fig.7).
2. Indicator light, light green when normal use,
orange light when charging.
3-2 Place the Specimen Slide
Place the cover glass of slide②faced upwards
and move the specimen to the center (aligned
with the center of objective). And fix the coverslip
by the slide-holder (see Fig.8).
3-3 Adjust the Focus
1. Move the objective 4X into the optical path.
2. Observe the right eyepiece with right eye, rotate
the coarse focusing knob①until the specimen
outline appears in the view field (see Fig. 9).
3. Rotate the fine focusing knob③ for clear
details.
★The position screw②can avoid the objective
touching the clips.
3-4 Adjust the Focusing Tension
If the handle is very heavy when focusing or
the specimen leaves the focus plane after
focusing or the stage declines itself, please adjust
the tension adjustment ring① (see Fig. 10).
To tighten the focusing arm, rotate the tension
adjustment ring① according to the arrowhead
pointed; loosen it in the reverse direction.
Fig.7
Fig. 9
Fig.8
Fig. 10
Fig.7

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BS-2026 Series
3-5 Aperture Diaphragm
1. The aperture diaphragm decides the numerical
aperture of the illumination system. Only when
the N.A. of illumination system is matching with
the N.A. of the objective, it can obtain better
resolution and contrast, and also increase the
depth of field.
2. For the microscope with disc diaphragm, turn
the diaphragm to select a aperture to get the
background brightness suitable (see Fig. 11).
3-6 Use the Oil Objective (100X)
1. Use the 4X objective to focus the specimen.
2.Place a drop of oil①on the specimen observed
(see Fig. 12).
3. Rotate the nosepiece counterclockwise and
rotate the oil objective (100X) into the light path.
Then use the fine focusing knob to focus.
★Make sure there is no air bubble in the oil for
fear affect the image.
A. Move the eyepiece to examine the air bubble.
Open the aperture diaphragm and field
diaphragm fully and observe the edge of the
objective field (It seems round and bright).
B. Rotate nosepiece slightly and swing the oil
objective to remove the air bubble.
4. After using, wipe the front lens with a tissue
moistened with a small amount of 3:7 mixture of
alcohol and ether or with dimethylbenzene. Wipe
off the oil on the specimen.
★Don’t put another objective to the light path
before the oil is wiped to avoid wetting the dry
objective.
★Too much dimethylbenzene would dissolve
the lens’s stickiness.
Fig. 11
Fig. 12

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BS-2026
Series 3-7 Use binocular/trinocular head
3-7-1 Adjust the Interpupillary Distance
When observe with two eyes, hold the base of
the prism and rotate them around the axis until
there is only one field of view.
“①”on the eyepiece base points to the
scale②of interpupillary indication, means the
value of interpupillary distance (see Fig. 13).
Adjustable range: 50~75mm.
★Remember your interpupillary distance for
further operation.
3-7-2 Assembling and using of the TV Device
1. Loosen the lock screw①of trinocular head,
and take out the dust-cover②(See Fig. 14).
2. Take down the two dust-covers of the TV
adapter③. Insert the TV adapter into the
trinocular head as shown in the figure and screw
down the lock screw①.
3. Loosen the lock screw④of the TV adapter.
Take down the vidicon interface (C type) ⑤from
the TV adapter, and screw into the CCD or
camera⑥. Then assemble the camera on the TV
adapter, and screw down the lock screw④.
4. For binocular observation, after the image is
clear, observe the image of CCD. If the image is
unclear, rotate the TV adapter③for focusing
until it is clear.
3-8 Use mechanical platforms (Optional)
3-8-1 Place the Specimen Slide
1. Push the wrench①of the specimen holder
backwards.
2. Place the cover glass of slide②faced upwards
into the clip, loosen the wrench①and clamp the
slide (see Fig.15).
Fig. 14
Fig.15
Fig. 13

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BS-2026 Series
3. Rotate the X and Y-axis knob③of the stage,
and move the specimen to the center (aligned
with the center of objective).
3-8-2 Aperture Diaphragm
1. The aperture diaphragm decides the numerical
aperture of the illumination system. Only when
the N.A. of illumination system is matching with
the N.A. of the objective, it can obtain better
resolution and contrast, and also increase the
depth of field.
2. Turn the condenser clockwise or
counterclockwise to change the height of the
condenser (See Fig. 16).
3. Before installing the filter, rotate the condenser
to the bottom and then open the filter holder.
★Place the filter’s rough side downward.
3-9 Store the Power Cord
When the microscope is not in use, the power
cord can be wrapped around the rear cover, and
the power charger can be plugged into the socket
on the back of the microscope to avoid being lost.
(See Fig. 17)
★Don’t use strong force when the power cord is
bended or twisted, otherwise it will be damaged.
★Use the special wire supplied by our company.
If it’s lost or damaged, choose one in the same
specifications.
Fig. 16
Fig. 17

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4. Troubleshooting BS-2026 Series
As the performance of microscope can’t play fully due to unfamiliar operations, the table
below can provide some solutions.
Problem
Cause
Solution
1. Optical Part
(1) The LED light is bright,
but it’s dark in the field of
view.
Field diaphragm is not large
enough.
Enlarge the field diaphragm.
Condenser is too low.
Adjust the position of
condenser.
(2) The edge of the field of
view is dark or not even.
The nosepiece is not in the right
position.
Turn the nosepiece into the
right position.
Stain or dust has accumulated
on the lens such as condenser,
objective, or eyepiece.
Clean the lens.
(3) Stain or dust is
observed in the field of
view.
Stains have accumulated on the
specimen.
Clean the specimen.
Stains have accumulated on the
lens.
Clean the lens.
(4) Unclear image
There’s no cover glass on the
specimen.
Add the cover glass.
The cover glass is not standard.
Use a standard cover glass
with thickness δ0.17mm.
The cover glass faces down.
Adjust it.
The immersion oil has
accumulated on the dry
objective.
Clean it thoroughly.
The immersion oil is not used
for oil objective.
Use immersion oil.
Air bubble is in the immersion.
Get rid of the air bubble.
Use wrong immersion oil.
Use a correct one (cedar oil).
The aperture diaphragm is not
opened correctly.
Adjust the aperture
diaphragm.
Stain or dust has accumulated
on the inlet lens of eyepiece.
Clean the lens.
The condenser is too low.
Adjust the condenser.
(5) One side of the field of
view is dark or the image
moves while focusing.
The specimen is not fixed.
Fix the specimen.
The nosepiece is not in the right
position.
Turn the nosepiece into the
right position.
Condenser centered incorrectly.
Center the condenser.

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BS-2026 Series
Problem
Cause
Solution
(6) The eyes feel tired
easily. The right field of
view doesn’t superpose
with the left.
Interpupillary distance is wrong.
Adjust the interpupillary
distance.
Eyepieces for the left eye and
right eye are different.
Use the same eyepiece.
2. Mechanical Part
(1) Cannot get the
objective focused in high
magnification.
The cover glass faces down.
Put the cover glass to face up.
The cover glass is too thick.
Use a standard cover glass
with thickness δ0.17mm.
(2) The objective touches
the cover glass while
turning the nosepiece from
low to high magnification.
The cover glass faces down.
Put the cover glass to face up.
The cover glass is not standard.
Use a standard cover glass
with thickness δ0.17mm.
(3) Coarse focusing knob is
too tight.
Tension knob is too tight.
Loosen it a little.
(4) Stage declines itself,
cannot stay on the focal
plane when observing.
Tension knob is too loose.
Tighten it a little.
(5) Coarse focusing knob
can’t rise.
The limit stop knob is locked.
Loosen the knob.
(6) Coarse focusing knob
can’t decline.
The base of the condenser is
too low.
Raise the base.
(7) Cannot move the slide
smoothly.
The slide is not fixed correctly.
Adjust it correctly.
The movable specimen holder is
not fixed properly.
Adjust it correctly.
(8) The image moves
obviously when touching
the stage.
The stage is fastened
incorrectly.
Fasten the stage correctly.
3. Electrical Part
(1) The LED light does not
work.
No power supply.
Check the connection of the
power cable.
The LED bulb is not installed
correctly.
Install it correctly.
The LED bulb is burnt out.
Replace it.
(2) The bulb burnt out very
often.
A wrong bulb is used.
Replace it with a correct one.
(3) The illumination is not
bright enough.
A wrong bulb is used.
Replace it with a correct one.
The use of light adjustment
knob is wrong.
Adjust correctly.