BestScope BS-2042 Series User manual

Biological Microscope
BS-2042 Series
Instruction Manual
This manual expatiates the using method, troubleshooting and maintenance about BS-2042
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-2042 Series
Before Use
1. Components............................................................................................................4
2. Assembling..............................................................................................................6
2-1 Assembling Scheme...........................................................................................6
2-2 Assembling Steps ..............................................................................................7
3. Operation................................................................................................................9
3-1 Set Illumination .................................................................................................9
3-2 Place the Specimen Slide...................................................................................9
3-3 Adjust the Focus..............................................................................................10
3-4 Adjust the Focusing Tension ...........................................................................10
3-5 Adjust the Interpupillary Distance...................................................................10
3-6 Adjust the Field Diaphragm (Iris Diaphragm Koehler Illuminator Condenser
Optional)................................................................................................................12
3-7 Adjust the Aperture Diaphragm ......................................................................12
3-8 Use the Oil Objective (100X) ...........................................................................13
3-9 Use the Filter ...................................................................................................13
3-10 Replace the Fuse ...........................................................................................15
4. Technical Specifications ........................................................................................16
4-1 BS-2042 Series Biological Microscope Technical Parameters .........................16
4-2 Parameters of objective ..................................................................................16
5. Troubleshooting....................................................................................................17

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Before Use BS-2042 Series
1. Operation Notice
1. As the microscope is a high precision
instrument, always operate it with care, and
avoid physical shake during the operation.
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, use both hands
to hold its back hand-clasping ①and the front
base ②, and lay it down carefully (see Fig. 1).
★It will damage the microscope by holding
the stage, focusing knob or head when
moving.
4. When working, the surface of condenser will
be very hot. Make sure there is enough room for
the heat dissipating around the condenser ③
(see Fig. 2).
5. Connect the microscope to the ground to
avoid lightning strike.
6. For safety, make sure the power switch ④is
at “0”(off) and power it off before replacing the
bulb or fuse, and wait until the lamp cools down
(see Fig. 2).
★Bulb selected only: Single 3W LED light.
7. Wide voltage range is supported as 100~240V.
Additional transformer is not necessary. Make
sure the voltage is in this range.
8. Use the special wire supplied by our company.
Fig. 1
Fig. 2

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BS-2042 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.
|
Main switch ON
O
Main switch OFF

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1. Components BS-2042 Series
Tension
Adjustment
Ring
Arm
Coarse
Focusing
Knob
Fine Focusing
Knob
Light Adjustment
Knob
Built-in Koehler
Illuminator
Condenser
Binocular Head
Eyepiece
Objective
Stage
Koehler Illuminator
Condenser
Focus Arm

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BS-2042 Series
Objective
Nosepiece
Coarse
Focusing
Knob
Power Switch
Lock-screw
Y-axis
Adjustment
Knob
X-axis Adjustment
Knob
Fine
Focusing
Knob
Diaphragm
Adjustment Knob

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2. Assembling BS-2042 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 or dirt. Assemble carefully and do not
scrap any part or touch the glass surface.
Eyepiece
Objective
Condenser
Power Cord

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BS-2042 Series
2-2 Assembling Steps
2-2-1 Assemble the Condenser
1. Rotate the coarse focusing knob①to raise
the stage to the highest position (see Fig.
3).
2. Rotate the condenser up-down knob②to
lower the bracket of condenser to the
suitable position.
3. Fully loosen the condenser lock-screw③.
4. Insert the condenser into the hole of stand
according to the arrowhead, until the
condenser is equal with the stand, and
then rotate the condenser to make the
handle frontward.
5. Tighten the lock-screw ③of condenser,
then raise the condenser with the up-down
knob to the highest position.
2-2-2 Assemble the Objective
1. Rotate the coarse focusing knob to lower
the stage to a suitable position (see Fig. 4).
2. Install the objectives into the objective
nosepiece②from the lowest magnification
to the highest in a clockwise direction from
the rear.
★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
“ka-da”, to make sure the objective
wanted is in the center of optical path.
图3
图14
图13
图4
图5
Fig. 3
图4
图4
Fig. 4

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BS-2042 Series
2-2-3 Assemble the Eyepiece
1. Take down the cover of eyepiece tube①.
2. Insert the eyepiece ②into the eyepiece
tube, until touch the surface (see Fig. 5).
2-2-4 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 power switch is at“0”(OFF)
before connecting.
2. Insert the connector①of power cord into
the power socket ②, and make sure it
connects
well (see Fig. 6).
3. Insert the other connector into the socket
of
power supply, and make sure it connects well.
★Use the special wire supplied by our
company. If it’s lost or damaged, choose
one with 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. 5
Fig. 6

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3. Operation BS-2042 Series
3-1 Set Illumination
1. Put through the power and turn on the main
power switch to“—”.
2. Adjust the light adjustment knob①until the
illumination is comfortable for observation.
Rotate the light adjustment knob clockwise to
raise the voltage and brightness. Rotate the light
adjustment knob counterclockwise to lower the
voltage and brightness (see Fig. 7).
Assemble the Mirror (Optional)
1. Turn off the power switch to “0”.
2. Loosen the hexagon screw①with the spanner,
to screw off the built-in Koehler illuminator
condenser②(see Fig. 8).
3. Screw on the mirror ③according to the
arrowhead pointed, and tighten the hexagon
screw①with the spanner.
4. Rotate the mirror stand④, to fill the field with
light.
3-2 Place the Specimen Slide
1. Push the wrench of the specimen holder
backwards.
2. Loosen the wrench①, and clamp the
slide②by the clips while the cover glass
faces up (see Fig. 9).
3. Rotate the X and Y-axis knob③. Move the
specimen to the center (alignment with the
center of the objective).
图9
Fig. 8
Fig. 7
图
8
Fig.9

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BS-2042 Series
3-3 Adjust the Focus
1. Move the objective 4X to the light path.
2. Observe the right eyepiece with right eye.
Rotate the coarse focusing knob①until the
image appears (see Fig. 10).
3. Rotate the fine focusing knob③for clear
details.
★The position screw②can stop 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. 11).
To tighten the focusing arm, rotate the
tension adjustment ring①according to the
arrowhead pointed; to loosen it in the
reverse
direction.
3-5 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.
①on the eyepiece base points to the scale
②of interpupillary indication, which means
the value of interpupillary distance (see Fig.
12).
Range：50～76mm.
★Remember your interpupillary distance for
further operation.
Fig. 10
Fig. 11
Fig12

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BS-2042 Series
3-6 Adjust the Field Diaphragm (Iris
Diaphragm Koehler Illuminator Condenser
Optional)
By limiting the diameter of the beam entering
the condenser, the field diaphragm can
prevent other light and strengthen the image
contrast. When the image is just on the edge
of the field of view, the objective can show
the best performance and obtain the clearest
image.
3-7 Adjust the Aperture Diaphragm
1.The aperture diaphragm decides the
numerical aperture of the illumination. Only
when the N.A. of illumination is matching
with the N.A. of the objective, it can obtain
better resolution and contrast, and also
increase the depth of field.
2. As the contrast is usually low, rotate the
handle③to make the arrowhead pointed
to the related magnification position on
condenser base④, namely, to adjust the
N.A. of illumination to 70%-80% of the N.A.
of objective. The eyepiece can be taken off
when it’s necessary to observe from the
tube.
Adjust the ring③until see the figure as
shown in Fig. 13, to adjust the proportion
(see Fig. 13&14, ①is the image of
aperture diaphragm, ②is the edge of
objective).
Fig. 13
Fig. 14

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BS-2042 Series
3-8 Use the Oil Objective (100X)
1. Use objective 4X to focus the specimen.
2. Place a drop of oil①on the specimen
(see Fig. 15).
3. Rotate the nosepiece counterclockwise
and rotate the oil objective (100X) to 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 from the tube (It seems
round and light).
B. Rotate nosepiece slightly and swing the
oil objective for some times 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 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.
3-9 Use the Filter
Filter can make the background more suitable
and increase the contrast.
Iris diaphragm Koehler
Illuminator Condenser (Optional)
Put the filter into the groove of condenser (see
Fig. 16).
Built-in Koehler Illuminator Condenser
Screw off the condenser cover①from
condenser base②, and put the filer into the
groove of condenser base②, and then screw on
the condenser cover①(see Fig. 17).
★There are four kinds of filter: blue,
green, yellow and white.
★Place the filter’s rough side downward.
Fig. 15
Fig. 16
Fig. 17

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BS-2042 Series
3-10 Replace the Fuse
Turn the main switch to “0”(OFF) before
replacing the fuse. Pull out the power cord.
Then
screw off the fuse group①from the fuse
base②
with a “-”type screwdriver. Install a new fuse
and screw it on the fuse base (see Fig. 18).
★Specification of the fuse: 250V, 3.15A.
Fig. 18

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4. Technical Specifications BS-2042 Series
4-1 BS-2042 Series Biological Microscope Technical Parameters
4-2 Parameters of objective
Optical system
UIS (universal infinity-corrected optical system)
Head
Binocular head of Gemel type, 30°inclined
Eyepiece
PL10X18T diopter adjustable eyepiece, 18mm line field of view
Nosepiece
Reversed quadruple nosepiece
Objective
Infinity Plan achromatic objective（4X, 10X, 40X, 100X）
Focusing
system
Coaxial coarse& fine focusing system, with limit-stopper& tension adjustable.
Travel rang: 25mm. Fine focusing precision: 0.002mm
Stage
Rectangle built in low position coaxial mechanical stage, single slide clip, area
140x132mm, moving range 76x50mm
Condenser
Built-in Koehler illuminator systems, Pre-centered.
Iris diaphragm Koehler illuminator condenser and mirror optional.
Illuminator
100～240V wide voltage., output single 3W LED light, continuous adjustment of
brightness.
Operation
Environment
●Use indoor
●Altitude: max. 2000m
●Environment temperature: 5℃-40℃（41ºF-109ºF）
●Max. relative humidity: 80% at 31℃（88ºF）, and then declined linearly. 70% at
34℃（93ºF）, 60% at 37℃（99ºF）, 50% at 40℃（104ºF）.
●Degree of pollution: 2 ( refer to IEC664)
Type
Magnification
Numerical
aperture
(N.A.)
Conjugate
distance(mm)
Parfocal
distance(mm)
Thickness of
the cover slip
Magnification
market
(color ring)
4X
0.10
∞
45
0.17
Red
10X
0.25
∞
45
0.17
Yellow
40X(S)
0.65
∞
45
0.17
Light Blue
Infinity Plan
achromatic
objective
100X(S)oil
1.25
∞
45
0.17
White
舜宇集团
XY 系列实验室生物显微镜

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5. Troubleshooting BS-2042 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
Field diaphragm is not large enough.
Enlarge the field diaphragm.
(1) The LED light is
bright, but it’s dark
in the field of view.
Condenser is too low.
Adjust the condenser.
The nosepiece is not in the right
position.
Turn the nosepiece into the
right position.
(2) The side of the
field of view is dark
or not even.
Stain or dust has accumulated on the
condenser, objective, eyepieces, and
base lens.
Clean the lens.
Stains have accumulated on the
specimen.
Clean the specimen.
(3) Stain or dust is
observed in the
field of view.
Stains have accumulated on the lens.
Clean the lens.
No cover glass on the specimen slide.
Add the cover glass.
The cover glass is not standard.
Use a standard cover glass
with thickness 0.17mm.
The cover glass faces down.
Put the cover glass to face
up.
The immersion oil has accumulated on
the dry objective.
Clean thoroughly.
The immersion oil is not used for oil
objective 100XR.
Use immersion oil.
Air bubble in the immersion.
Get rid of the air bubble.
Use wrong immersion oil.
Use a correct one.
The aperture is not opened correctly.
Adjust the iris diaphragm.
Stain or dust has accumulated on the
lens in the inlet of the head.
Clean the lens.
(4) Unclear image
The condenser is not in the right
position.
Adjust the condenser.
The specimen slide is not fixed.
Fix with clips.
The nosepiece is not in the right
position.
Turn the nosepiece into the
right position.
(5) One side of the
field of view is dark
or the image
moves while
focusing.
Condenser centered incorrectly.
Center the condenser.

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BS-2042 Series

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Problem
Cause
Solution
Interpupillary distance is wrong.
Adjust the interpupillary
distance.
(6) The eyes feel
tired easily. The
right field of view
doesn’t superpose
with the left.
The eyepieces for the right are
different from the left.
Use the same eyepieces.
2. Mechanical Part
The cover glass faces down.
Put the cover glass to face
up.
(1) Can not get the
objective focused.
The cover glass is not standard.
Use a standard cover glass
with thickness 0.17mm.
The cover glass faces down.
Put the cover glass to face
up.
(2) The objective
touches the cover
glass while turning
the nosepiece.
The cover glass is not standard.
Use a standard cover glass
with thickness 0.17mm.
(3) Coarse
focusing knob is
too tight.
Tension knob is too tight.
Loosen a little.
(4) Stage declines
itself.
Tension knob is too loose.
Tighten 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.
The slide is not fixed correctly.
Adjust it correctly.
(7) Can not move
the slide smoothly.
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
No power supply.
Check the connection of the
power cable.
The LED light is not inserted correctly.
Insert it correctly.
(1) The LED light
does not work.
The LED lights burnt out.
Replace it.
(2) The LED light
burnt out usually.
Use a wrong LED lights.
Replace with a correct one.
Use a wrong LED lights.
Replace with a correct one.
(3) The field of
view is not bright
enough.
The use of light adjustment knob is
wrong.
Adjust correctly.

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