BestScope BS-6020RF User manual

METALLURGICAL
MICROSCOPE
Model：BS-6020RF⁄TRF
User Manual
It is recommended strongly that you study this manual thoroughly before using the
microscope. Retain this manual in an easily accessible place near the work desk for future.
reference.

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Contents BS-6020RF∕TRF
USER NOTICE…………………………………………………………… 2
1. Components………………………………………………………………3
2. Installation…………………………………………………………………5
3. Operation………………………………………………………………… 10
4. Observation Methods ……………………………………………… 17
5. Specification …………………………………………………………… 19
6. Troubleshooting ……………………………………………………… 20

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Use Notices BS-6020RF⁄TRF
I、Safety note
1. Carefully open the box, avoid the accessories, like lens, dropping to ground and being
damaged.
2. Do keep the instrument out of direct sunlight, high temperature or humidity, dusty and easy
shaking environment. Make sure the stage is smooth, horizontal and firm enough.
3. When moving the instrument, please use two hands to grip with the two sides of the
microscope body.
4. When running, the lamp house and nearby parts will be very hot. Please ensure there is enough
cooling room for them.
5. Make sure the instrument is earthed, to avoid lighting strike.
6. For safety, be sure the main switch is in “O”(off) state before replace the halogen lamp or the
fuse, then cut off the power, and do the operation after the lamp bulb and the lamp house
completely cool.
7. Use the factory supplied power cord, please.
II、Maintenance
1. All the lenses have been well checked and adjusted. It is forbidden to disassemble them
yourself.
2. The nosepiece and coarse/fine focus unit have a compact and precise frame, please don’t
disassemble them as possible as you can.
3. Keep the instrument clean, wipe dust regularly, and be attention to avoid contaminating the
optical elements especially.
4. The contaminations on the prism, as finger mark and oil, could be gently wiped with a piece of
soft cloth or tissue paper, gauze which has been immersed in pure alcohol or xylene. (note that
the alcohol and the xylene are all burned easily, do not let them near the fire, and use them
in a drafty room as possible as you can.)
5. Don’t use organic solvent to wipe the non-optical elements, when you need to clean, use the
soft detergent, please.
6. When using, if the microscope is splash by liquid, cut off the power at once, and wipe up the
moisture.
7. Do not disassemble any parts of the microscope. That will affect the function or decline the
performance of the microscope.
8. Place the instrument in a cool, dry position. After using the microscope, remember to cover it
with dust helmet. Do wait for the lamp house cooling completely before cover.

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1. Name of Components BS-6020RF⁄TRF
Mirror Selector Lever
Li
g
ht Path Selector Leve
r
Analyzer Insertion Slot
ND Filter Lever
Polarizer Insertion Slot
Aperture Diaphragm Lever
Field Dia
p
hra
g
m Leve
r
Main Switch
Brightness Adjustment Knob
Right Fine Focus Knob
Mechanical Stage
Portrait Adjustment
Knob
Lateral Adjustment
Knob
Lamp housing
Trinoclular Viewing
Filter Insertion Slot (The
filter should be inserted
from the left
)
Right Coarse Focus Knob
Components name of BS-6020TRF

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BS-6020RF⁄TRF
Components name of BS-6020RF
Trinoclular Viewing
Mirror Selector Lever
ND Filter Lever
Mechanical Stage
Main Switch Lateral Adjustment
Knob
Portrait Adjustment
Knob
Li
g
ht Path Selector Leve
r
Analyzer Insertion Slot
Lamp housing
Filter Insertion Slot (The
filter should be inserted
from the left
)
Aperture Diaphragm Lever
Field Dia
p
hra
g
m Leve
r
Polarizer Insertion Slot
Right Coarse Focus Knob
Brightness Adjustment Knob
Right Fine Focus Knob

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2．Installation BS-6020RF⁄TRF
2-1 Installation Diagram
The following figure shows the installation sequence of the components. The number in the figure
show the installation steps.
Before installing, be sure every components is clean, do not score any parts or glass surface.
Keep well with the supplied hexagon wrench. When changing the components, you will need
it again.
Video Port
Trinocular Viewing Unit
10 ×Wide Field
Eyepiece
Lamp
housing
Reflected Light Brightfield/Darkfield
Illuminator
Infinite Plan Objective
Mechanical Stage Support
Device
Microscope Body
①
⑤
⑥
③
⑦
④
②

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2-2InstallationSteps BS-6020RF⁄TRF
2-2-1 Installing the Mechanical
Stage Support Device
1. Before installing the device, be sure to
adjust the coarse focus knob①. Make
the guide board ②down to the lowest
position, so you can install the
mechanical stage support device easily.
2. Hold on the mechanical stage support
device (Fig. 2), place it from the top of
the guide board (Fig.1), let the device
(Fig.2) falling free until it reach the limit
position. Use the hexagon wrench screw
down the locking block ③, make the
stage support device and the guide board
fixed together(Fig.3).
The mechanical stage⑤have been
adjusted horizontally and fixed
together before leaving factory. Do
not disassembly unless necessary,
that may affect the observation
precision of the instrument.
Fig.1
②
①
Fig.2
⑤③
④
Fig. 3

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BS-6020RF⁄TRF
2-2-2 Installing the reflected light
brightfield/darkfield illuminator
1. Installing the reflected light illuminator
(Fig.4) on the head of
microscope body(Fig. 5), and turn to a
proper position, then screw down the bolt
⑥to fix it.
2-2-3 Installing the Video Port
1. Insert the video port (Fig.6) into the
illuminator (Fig. 4), then screw down
the bolt to fix it.
2-2-4 Installing the Objective
1. Adjusting the coarse focus knob until the
support device of the mechanical stage
reach its low limit position.
2. Wresting the lowest magnification
objective onto the nosepiece from the
left or the right side, then push the
nosepiece clockwise, then place other
objectives by the sequence of low to
high magnification (Fig.7).
Installing objective this way will make
the change of magnification to be easier
while in using.
Clean the objective regularly, the
objective of the inversed microscope
is very sensitive to dust.
When replacing the objective, slowly
turning the nosepiece until you hear
“clicked”, that means the objective
enter the required position--the light
path center.
Fig.4
⑦
⑧
Fig.5
⑥
Fig.6
⑨
Fig.7

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BS-6020RF⁄TRF
2-2-5 Installing the Video Port
(optional)
Insert the video port (Fig. 8) into the
trinocular unit (Fig. 6), then screw down
the bolt ⑨to fix it.
2-2-6 Installing the Eyepiece
Insert the eyepiece (Fig.9) into the
eyepiece tube until they are against each
other.
2-2-7 Installing the Lamp Housing
1. Pushing the lamp holder (Fig.10)into the
illumination kits(Fig. 4) gently until they are
against each other, turn to a proper position,
then screw down the bolt ⑧to fix it.
2. Insert the power plug①into the power jack
of the microscope②, and screw down the bolt
to fix it. The result in show in Fig. 12.
◎When using transmitted light illuminator,
remove the dust cap first, then pushing the
lamp holder (Fig.10)into the jack on the back
of the microscope (Fig.11) gently and turn to a
proper position, then screw down the bolt ④.
Insert the power plug①into the power jack
of the microscope③, and screw down the bolt
to fix it.
Fig.8
Fig.9
Fig.10
①
Fig.11
②
③
④
Fi
g
.12

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BS-6020RF⁄TRF
Fig.13
①
②
Fig.14
③④
Fig.15
2-2-8 Attaching the Halogen Bulb
The applicable lamp bulb is the
24V100WHAL.
1. Fully loosen the clamping screw ①at the
top of the lamp housing using the provided
hexagon wrench.
2. Remove the lamp housing ②by lifting it
up.
3. Tilt the bulb socket by 90°(Fig. 14)
4. While pushing down the bulb clamping
levers, hold the halogen bulb with gloves or
a piece of gauze, insert the bulb pins into
the sections as far as they will go.
Then return the lamp clamping lever gently
back to the original position to clamp the
bulb.
Caution for Bulb Replacement Durig or
Right After Use
When using, or soon after it is turned off
the lamp, the lamp house and nearby parts
will be very hot and will cause serious burns.
Please turn the main switch on “O” (off),
pull out power plug, and make sure the bulb,
the lamp room and periphery are all cool.
Then, you can do your replacing.
Please insert the lamp gently, or it will
be damaged by excessive extrusion.
Do not touch the Halogen bulb with
your bare hands. It will shorten the
service life or cause it to burst. If you
leave finger marks on the surface
carelessly, clean it with a dry soft cloth.
When using, the temperature of the
lamp housing surface will be very hot,
please pay attention to the warning
written on the Warning board.

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3.Operation BS-6020RF⁄TRF
3-1 Turning on the Lamp
Connect the power, press the main switch
①to the “I”(on) position.
◎When using transmitted light illumination,
fixing the lamp holder into the jack on the back
of the microscope (Fig.11) ,and insert the
power plug into the power jack of the
microscope (③in Fig.11).Then press the main
switch ①to the “‖”(on) position.
3-2 Adjust Brightness
Turning the brightness adjustment knob
②clockwise, the voltage raise, and the
brightness strengthen; turning with the
anti-direction, the voltage decline, and the
brightness weaken.
 Using the lamp in a low voltage condition,
will prolong the use life.
3-3 Adjust the Tension Adjustment
Collar
 The tightness of the tension adjustment
collar has adjusted before leaving factory,
if finding it’s loosing (the mechanical
stage drop itself because of deadweight),
please turning the tension adjustment
collar③until the tightness is in order.
Fig.16
①②
collar
③
Fig.17

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BS-6020RF⁄TRF
3-4 Placing Specimen
1. Fix the specimen ②on the sample board
①by plasticine ③, be sure that the
specimen surface is parallel to the sample
board . It is conveniently to use smoothing
presses to flatten the specimen（Fig. 19）
2. Place the slide on the mechanical stage.
Use the stage clips to clamp the slide gently.
3. Turn the portrait and lateral adjustment
knob of the mechanical ruler, move the
specimen onto the required position.
Be careful when changing the objective.
If you finish the observation with the short
working distance objective, and want to
change another r one, be careful of not letting
the objective touch the specimen.
3-5 Adjusting the Interpupillar
Distance
The interpupillar distance range: 48mm～
75mm. When observing with two eyes, hold
on the left and right prism holder, turn around
the axis(Fig.28), adjust the interpupillar
distance until the left and right fields of view
coincide completely.
3-6 Adjusting the Diopter
The right ocular tube is fixed. So by
turning the left diopter ring after the right
ocular focus on the specimen, the operator
who’s left and right eye has different eyesight
can obtain a comfortable focus position with
both eyes.
图20
Fig.20
图18
Fig.18
①
②
③
Fig.19
smoothing
presses
Diopter
adjustment ring
Fig.21

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BS-6020RF⁄TRF
3-7 Focus
When not using the video set
1. Push in the light path selector lever ①
completely, then observe with both eyes. Use
the 10×objective focus, to avoid the objective
touch with the specimen, you should raise the
mechanical stage at first, let the specimen close
to the objective, then slowly separating them to
focus.
2. The operator can converse turn the coarse
focus knob to get the specimen down ,and
search images in the 10×ocular simultaneously,
then use the fine knob to focus. At this moment,
you can replace other magnification objectives
safely, and focus without the risk of destroying
the specimen.
When using the video set
Pull out the light path selector lever ①,
observe with both eyes, when the image is
sharp, you can see the pictures directly on the
video screen which connected by the
microphotograph system through the video
mount.
 If you need to fix the stage on a vertical
position to make the observation become
more convenience, take use of the locking
set②.
①
Fig.22
Fig.23
②

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BS-6020RF⁄TRF
Fig.24
Fig.26
②
④
Usable Filters Applications
Color
temperature
conversion
filter
Turns the illumination light into daylight.
Used in general observations and color
photography.
Green filter Enhanced contrast in monochrome observation.
Used in monochrome photography
Yellow filter Contrast filter for observation of semiconductor
wafers
Frost filter Reduces irregularity in the illumination field,
but also reduces the brightness
ND25 Adjusts the brightness of the light source.
(Transmittance: 25%)
ND6 Adjusts the brightness of the light source.
(Transmittance: 6%
3-8 Usin
g
the ND Filter Knob
1. The ND Filter is interlocked with
brightfield (BF) light path switching so
it can be engaged or disengaged
according to the mirror selector lever
①.The ND filter makes it possible to
reduce the glare when darkfield(DF)is
switch to brightfield(BF).
Releasing interlocking
◎The ND filter knob has been interlocked
at the factory. If brightness is not
enough during brightfield, DIC or other
observation, the interlocking can be
released.
1. Loosen the screw interlocking the ND
filter by inserting the Allen screwdriver
into the hole ②on the left side of the
reflected light illuminator.
2. Now the interlocking is released and the
ND filter knob (Fig. 17) is active. Pull
the lever out to disengage the ND filter
from the light path.
3-9 Using the Filters
◎Engage the optimum filter sliders for the
purpose of observation in the two filter
insertion slots ④. Be sure to engage
from the left side.
◎The first click position is the idle
position and the second click engages
the filter in the light path.
③
①
Fig.25

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BS-6020RF⁄TRF
3-10 Selecting the Light Path of the
trinocular Tube
1. Slide the mirror selector lever ①toward the
indication of the mirror for the desired
observation method.
BF: Reflected light brightfield observation
DF: Reflected light darkfield observation
◎ Be sure to slide the mirror selector lever
until it contacts the stopper.
3-11 Centering the Field Iris
Diaphragm (FS)
1. Slide the mirror selector lever ①to “BF”.
2. Engage the 10X objective by rotating the
revolving nosepiece, place the specimen on
the stage and adjust approximate focusing.
3. Pull out the FS knob ④on the reflected
light illuminator to reduce the aperture iris
diaphragm a little.
4. Rotate the two FS centering screws②using
the Allen screwdriver to adjust so that the
field iris image becomes concentric with
the field of view.
5. While pushing in the FS knob④, open the
field iris diaphragm until the field iris
image inscribes the field of view. If the
image is found to be eccentric, adjust the
centering again.
6. Open the field iris so that its image is almost
the same size as (Fig. 28 subscribes) the
field of view.
Using the Field Iris Diaphragm
● In reflected light brightfield observation
The field iris diaphragm adjusts the illuminated
area to obtain an image with high contrast.
According to the objective in use, adjust the FS
knob ④of the reflected light illuminator until
the iris image circumscribes the field of view to
block unnecessary light.
● In reflected light darkfield observation
The field iris diaphragm must be opened by
pushing in the FS knob.
①
②③
④
⑤
Fig.27
Fig.28
Field iris diaphragm image
Field of view of e
y
e
p
iece

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BS-6020RF⁄TRF
3-12 Centering the Aperture Iris Diaphragm
(AS)
1. Slide the mirror selector lever to “BF”.
2. Engage the 10X objective by rotating the
revolving nosepiece, place the specimen on
the stage and adjust approximate focusing.
3. Remove the eyepiece, look into the eyepiece
sleeve and pull the AS knob⑤, so that the
aperture is about 70%.
4. If the center of the iris diaphragm is
deviated, center it by rotating the two
AS centering screws(③in Fig. 27) using the
Allen screwdriver.
Using the Aperture Iris Diaphragm
●In reflected light brightfield observation,
optimum observation is generally possible by
setting the aperture to between 70% and 80%
of the aperture number of the objective(figure
29).
●In reflected light darkfield observation, the
aperture must be fully opened by pushing in the
AS knob.
◎With some specimens, an image with high
contrast and little flare may sometimes be
obtained when the aperture is slightly closed. It
is therefore recommended to also try a slightly
closed aperture.
3-13 Setting the Analyzer and Polarizer
1. Insert the polarizer(Fig. 30) into the polarizer
Insertion Slot③with the surface printing with
Silk Screen towards you, then push the
polarizer into the light path.
2. Remove the cover, then put the analyzer
(Fig.30 in the insertion slot(②in Fig.31).
3. Rotate the analyzer rotating dial ①to find
the position where the field of view is
darkest.
4. When the analyzer and polarizer are coupled
by using the coupling plate | provided with
the polarizer and tightening the clamping
knobs on it, the analyzer and polarizer can
be engaged or disengaged in the light path
together（Fig.31）.
Fig.29
The image of aperture iris diaphragm
①
Fig.30
Polarize
r
Coupling plate
Analyzer
Fig.31
②
④
③

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BS-6020RF⁄TR
3-14 Adjusting the Swing out
Condenser (Fig. 32)
The center of the condenser and the light axes
of the objective are coaxial. It has been
adjusted before leaving factory, so the user
needn’t to adjust them by self.
The highest position of the condenser has been
adjusted too. It also needn’t any user’s
operation.
Turn the condenser focus knob to shift the
condenser. It needs to raise the condenser
when using the high magnification objective,
and to decline when using the low
magnification one.
1. Using the Swing out Condenser
When using the low magnification objective,
turn out the condenser, and let it away from the
light path. While using the high magnification
objective, turn it into the light path.
2. Adjusting the Aperture Diaphragm
The aperture diaphragm is designed for the
adjustment of the numerical aperture , not for
the brightness. Generally, reducing the
diaphragm opening to 70- 80% of the N.A.
value of the respective objective will provide
an image of acceptable quality. If you want to
observe the image of the aperture diaphragm,
remove one eyepiece and look through the
tube. You will see a dark circle encroaching on
the bottom of the tube.
3-15 Adjusting the Field Diaphragm
(Fig. 33)
The control for the field diaphragm is a ring
used for adjusting the area of field diaphragm.
When using, turn the ring to reduce the field
diaphragm, look into the field, if the
diaphragm image is faintness, do the follow
steps: first, turn the condenser focus knob,
shift the condenser holder to the position
where the observed image of the field of view
is sharp; then open the field diaphragm, let the
image full of the field of view , reduce the
mixed light, improving the quality of the
image.
Fig.32
Fig.33

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－－－－
－－－－
－－－－－－－－－－－－－
－－－－－－－－－－－－－
－－－－－－－－－－－－－
－－－－－－－－－－－－－
－－－－－－－－－－－－－
－－－－－－－－－－－－－
－－－－－
－－－－
－－－－－
－－－－－－
－－－－－－－－－－－－－
ND filter knob (P. 13)
Light path selector knob (P. 14)
Mainswitch (P.10)
Stageplate (P.11)
Revolving nosepiece
Coarse/fine adjustment knobs (P. 12)
Binoculartube (P.11)
Diopter adjustment ring (P. 11)
ASknob (P.15)
FSknob (P.14)
Revolving nosepiece
Coarse/fine adjustment knobs
Brightness adjustment knob (P. 10)
Brightness adjustment knob (P. 10)
4.ObservationMetheods BS-6020RF⁄TRF
4-1 Reflected Light Brightfield/Darkfield Observation
◎The following flow shows the basic operating procedure for reflected light brightfield or darkfield
observation.
（Controls Used）
Select the brightfield (BF) or darkfield (DF) observation. －－－－－Mirror selector lever (P. 14)
Set the main switch to “ I ”
(
ON
)
.
Check interlockin
g
of the ND filte
r
Disengage the analyzer, polarizer,
filter
,
etc. from the li
g
ht
p
ath.
Select the li
g
ht
p
ath
Engage the desired objective in the light
p
ath and brin
g
the s
p
ecimen in focus.
Place the specimen on the stage.
En
g
a
g
e the 10X ob
j
ective in the li
g
ht
p
ath.
Brin
g
the s
p
eci
m
en in focus.
Adjust the interpupillary distance.
Ad
j
ust the dio
p
ter.
Ad
j
ust the bri
g
htness.
Insert the required filters
Adjust the aperture iris diaphragm and
field iris diaphragm.
◎Open both iris diaphragms in case of
DF observation.
Ad
j
ust the bri
g
htness.
Start observation.
Filter insertion slot (P. 13)

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BS-6020RF⁄TRF
4-2 Reflected Light Simplified Polarized Light Observation
1. Setting the Analyzer and Polarizer (Fig. 15).
2. Place the specimen on the stage and adjust the focus by moving the stage up or down. Now simplified
polarized light
observation can be started.
3. Adjust the field iris diaphragm so that its image circumscribes the field of view.
4. The contrast may sometimes be enhanced by closing the aperture iris diaphragm slightly.
4-3 Transmitted Light Observation
1. Installing the lamp housing。（see page 8 :Installing the lamp housing when using transmitted light
illuminator）.
2. Installing objective.
3. Installing the swing out condenser.
4. Set the main switch to “Ⅱ” (ON).
5. Fix the specimen on the stage, adjust the focus to begin observation.
◎At the Transmitted Light Observation, the method of condenser ,field iris diagram adjusting please
refer to section 3-14 and 3-15.

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5.Specifications BS-6020RF⁄TRF
BS-6020RF BS-6020TRF
Optical system Infinite Optical System ●●
Eyepiece (Ocular) Exceed wide field ocular EW10X/22, tube
Φ30 matched
●●
5×/0.12/∞/-(BF) ●●
10×/0.25/∞/-(BF/DF) ●●
20×/0.4/∞/0(BF/DF) ●●
50×/0.75/∞/0(BF) ●●
100×/0.9/∞/0(BF) ●●
40×/0.65/∞/0.17 ●
100×/1.25/∞/0.17 ●
40×/0.6/∞/0(BF/DF) ○○
Infinite plan
achromatic
50×/0.75/∞/0(BF/DF) ○○
Upper limit 30mm ●●
Viewing head
Compensation Free Trinocular Head，
Inclined at 30°, Interpupillar distance:
48-75mm
●●
24V, 100 W halogen bulb (pre-centered) ●●
Koehler Illumination，Aspheric collector ●●
Polarizer and analyzer ○○
coupling plate ○○
Reflected light
illumination
Blue, green, yellow filter and frosted glass ●●
Swing out condenser NA0.9/0.25 ●
24V/100W halogen bulb，Aspheric collector ●
Transmitted light
illumination, Blue filter ●
Filter ND25、ND6 ○○
Focus system
Coaxial Coarse and Fine Focusing System,
Sensitivity and Graduation of Fine Focus:
0.001mm, tension adjustment on coarse
focus adjustment knob. Upper limit stopper.
●●
Nosepiece Backward Quintuple Nosepiece ●●
Double layer mechanical stage, area:
186×138mm, movement range:
74mm×50mm
●●
sample board ●●
Stage
Slide ●
Smoothing presses ○○
Video accessories ○○
Video Mount C Mount 1×，0.5× ○○
Note: ●Standard outfit，○ Optional