Omax M8244 User manual

User Manual
Dual Head Binocular
Compound Microscope
Model M8244
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Table of Contents
i. Caution……..……………………………………………………………1
ii. Care and Maintenance……….………………………………….….…2
1. Component Illustration………………………….…………………..…3
2. Installation ……………………………………………………………...4
3. Operation……………………….………………………….…………....6
4. Specifications…………………….…………………………………......8
5. Troubleshooting Guide….................................................................9

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i. Caution
1. Find the “UP” sign and place the Styrofoam container on your table or bench so
that the arrow upward. Open the shipping carton carefully to prevent any
accessory, i.e. objectives or eyepieces, from dropping and being damaged.
2. Do not discard the molded Styrofoam container. The container should be retained
should the microscope ever requires reshipment.
3. Keep the instrument out of direct sunlight, high temperature or humidity, and dusty
environments. Ensure that the microscope is located on a smooth, level and firm
surface.
4. If any specimen solutions or other liquids splash onto the stage, objective or any
other component, disconnect the power cord immediately and wipe up the spillage.
Otherwise, the instrument may be damaged.
5. Important: the lamp, lamp housing and adjacent parts will become very hot. Do
not touch these parts until they have completely cooled. Never attempt to handle a
hot halogen bulb.
6. All electrical connectors (power cord) should be inserted into an electrical surge
suppressor to prevent damage due to voltage fluctuations.
7. For safety when replacing the halogen lamp or fuse, be sure the main switch is off,
unplug the power cord, and only replace the halogen bulb after the bulb and the
lamp house has completely cooled.
8. Confirm that the input voltage indicated on your microscope corresponds to your
line voltage. The use of a different input voltage other than that as indicated will
cause severe damage to the microscope.
9. Important: The two thumb screws on the viewing head block are for locking the
two viewing heads. If you want to remove the viewing head, turn the thumb screw
counter clockwise while holding the viewing head with another hand to prevent it
falling off.

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ii. Care and Maintenance
1. Do not attempt to disassemble any component including eyepieces, objectives or
focusing assembly.
2. Keep the instrument clean; remove dirt and debris regularly. Accumulated dirt on
metal surfaces should be cleaned with a damp cloth. More persistent dirt should be
removed using a mild soap solution. Do not use organic solvents for cleansing.
3. The outer surface of the optics should be inspected and cleaned periodically using
an air stream from an air bulb. If dirt remains on the optical surface, use a soft cloth
or cotton swab dampened with a lens cleaning solution (available at camera
stores). All optical lenses should be swabbed using a circular motion. A small
amount of absorbent cotton wound on the end of a tapered stick makes a useful
tool for cleaning recessed optical surfaces. Avoid using an excessive amount of
solvents as this may cause problems with optical coatings or cemented optics or
the flowing solvent may pick up grease making cleaning more difficult. Oil
immersion objectives should be cleaned immediately after use by removing the oil
with lens tissue or a clean, soft cloth.
4. Store the instrument in a cool, dry environment. Cover the microscope with the
dust cover when not in use.

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1Components Illustration
1. Eyepiece
2. Diopter Ring
3. Eyepiece Tube
4. Viewing Head H
5. Nosepiece
6. Objective
7. Slide Holder
8. Mechanical Stage
9. Condenser
10. Condenser Focus Knob
11. Light Collector
12. Base
13. Viewing Head V
14. Thumb Screw V
15. Thumb Screw H
16. Viewing Head Block
17. Thumb Screw
18. Body
19. Tension Collar
20. Coarse Focus Knob
21. Fine Focus Knob
22. Stage Knobs
23. Intensity Dial
24. Power Switch
1
2
3
4
5
6
7
8
9
10
11
13
14
15
16
17
18
19
20
21
22
23
12 24

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2Installation
2.1 Installation of the binocular dual view head
1) Loosen the thumb screw (17) on the top of the body (18) and remove the plastic
cover.
2) Remove the cap on the dovetail of the binocular viewing head block (16).
3) Insert the dovetail of binocular viewing head block (16) into the socket of the body
(18); tighten the thumb screw (17).
Caution: Do not release the head from your hand grip until you are sure the head is
installed securely.
2.2 Installation of the eyepieces
Remove the protective caps from the eyepiece tubes (3). Insert the eyepieces (1) into
the eyepiece tubes (3).
2.3 Installation of the objectives
1) Adjust the coarse focus knob (20) until the mechanical stage (8) is at its lowest
position.
2) Install the 4x objective into the nosepiece. Then in a clock-wise direction, rotate the
nosepiece and install each succeeding higher magnification objective.
Note: When changing the objective magnification, rotate the
objective nosepiece until you hear a “click” sound. This ensures the
objective is centered in the optical light path.
2.4 Installation of glass filter
1) Swing out the filter holder under the condenser (9).
2) Insert the filter into the holder, swing the holder in.
2.5 Changing the halogen bulb
1) Turn the power off and disconnect the power cord.
2) Allow some time to cool down the lamp.
3) Turn over the microscope on its side; find the bulb compartment at
the bottom.
4) Open the cover of the bulb compartment by loosening the thumb
screw. Take out the dead bulb and insert the new bulb. Be sure
the pins on the bulb are completely inserted into the lamp socket.
5) You may also loosen the two screws on the cover to adjust the
position of the bulb to get centered and even brightness.
6) Screw the cover on.
Caution: Before you turn over the microscope, be sure to take the
eyepieces off and be certain that the viewing heads are securely
locked by the thumb screws.

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2.6 Replacing the fuse
1) Turn off the power and disconnect the power cord.
2) Turn over the microscope on its side; find the fuse at the bottom of the base.
3) Turn the fuse holder counter-clockwise to take it off, insert new fuse, and then turn it
on clockwise.
Caution: Before you turn over the microscope, be sure to take the eyepieces off and be
certain that the head is securely locked by the thumb screw.
2.7 Installing the mirror (optional, your model may not have one)
1) Unplug the power cord.
2) Screw off the light collector Lens (11) on the base.
3) Screw the black disc onto the base and then insert the mirror into
the hole at the center of the black disc. You may try to get
reflected ambient light on either side of the mirror with different
angles for best result.
Note: The mirror is only used when there is a power failure or you are in the field and no
power is available.

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3Operation
3.1 Adjusting illumination
1) Connect the power cord and turn on the power switch (24).
2) Rotate the variable intensity dial (23) to increase or decrease the brightness.
3.2 Placing specimen
1) Place the slide on the mechanical stage (8).
2) Use the slide holder (7) to gently secure the slide. Turn the X and Y adjustment knobs
(22) to position the specimen for viewing.
Caution: Be sure not to allow an objective to touch a specimen slide when changing
objectives.
3.3 Focusing
1) With the 10x objective in position, raise the mechanical stage using the coarse focus
knob until the specimen is close to the objective
2) Turn the coarse focus knob until the specimen is in focus.
3) Then use the fine focus knob to obtain a sharp image. You may now switch to
another magnification objective.
Tips: To prevent your specimen slide from making contact with an objective, raise the
stage to its highest position without contacting the 100x objective, then tighten the upper
limit mechanical stage lever.
3.4 Condenser focusing
Turn the condenser focus knob (10) to raise or lower the condenser. The condenser
is raised when using high magnification objectives and lowered when using low
magnification objectives.
Note:
The centering of the condenser and the light axis of the objective are factory adjusted.
Do not attempt re-adjustment.
The highest position of the condenser has been factory adjusted. Do not attempt
re-adjustment.
3.5 Adjusting iris diaphragm
Slide the Iris diaphragm lever left or right to adjust the
aperture size.
Note: The iris diaphragm is designed to adjust the aperture
size, not to adjust brightness.
3.6 Adjusting interpupillary distance
While observing with both eyes, hold the left and right eye
tubes, slide in and out the tubes. The interpupillary distance is correct when the left
and right fields of view converge completely into one image.
3.7 Adjusting eyepiece diopter
1) Using the 10x objective and your right eye only, observe your specimen through the
Iris Diaphragm Lever

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eyepiece and bring it into focus by adjusting the focus knobs (20,21).
2) Then observe the specimen with your left eye only through the left eyepiece. If the
specimen is not in focus, rotate the diopter ring (2) until a sharp image is obtained.
3) Since both sides are adjustable, you may also do the above in the opposite way, in
other words, left eye first and right eye second.
3.8 Adjusting tension knob
The tightness of the tension adjustment collar (19) has been pre-set at the factory. If
the mechanical stage (8) drops by itself, rotate the tension adjustment collar (19)
located inside the focus knob (20) on the power switch side until the tension is in
maintained.

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4Specifications
General
Model M8244
Total Magnification 40X, 64X, 100X, 160X, 400X, 640X, 1000X, 1600X
Viewing Head Dual viewing head, binocular, inclined 45º, swiveling 360º
Interpupillary distance 55-75mm
Adjustable diopter on both eyepiece tubes
Eyepieces 2 pair of wide field eyepieces WF10X/18
Objective Tube Length 160mm
Nosepiece Revolving quadruple
Objectives Achromatic 4X, 10X, 40X (spring), 100X (spring, oil)
Condenser Abbe, NA=1.25, w/ iris diaphragm and filter holder
Rack and pinion adjustment
Focus Mechanism Coaxial coarse and fine focusing knobs on both sides w/ limit lock
Minimum fine focusing adjustment at 0.002mm, range 28 mm
Stage Large double layer mechanical stage
Dimension: 5-1/2” x 5-1/2” (140mmx140mm)
Movement range: 3” x 2” (75mm X 50mm)
Illumination Transmitted: 6V/20W, Halogen, Variable intensity
Power Supply AC 110V, 60HZ
Net Weight 12.6 lb (5.7 kg)
Eyepieces
Designation Magnification Field of View Focal Length
Wide Field 10X 18mm 24.94mm
Objectives
Magnification Numerical
Aperture Thickness of slide cover Focus Working
Distance Working Mode
4X 0.10 0.17mm 31.04mm 37.5mm Dry
10X 0.25 0.17mm 17.13mm 7.316mm Dry
40X(S) 0.65 0.17mm 4.65mm 0.632mm Dry
100X(S, Oil) 1.25 0.17mm 2.906mm 0.198mm Oil

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5Troubleshooting Guide
Optical Problems
Problem Cause Solution
Darkness at the
periphery or uneven
brightness in the
field of view
Revolving nosepiece not in click
stop position
Revolve the nosepiece to click-stop
position by swinging the objective
correctly into the optical path
The light source of the bulb is not at
the center Adjust the position of the bulb
Dirt or dust on the
view
Dirt or dust on the lens eyepiece,
condenser, objective, collector lens
or specimen
Clean the lens with a camera
cleaning kit
Poor image quality
No slide cover attached to the slide Attach a 0.17mm slide cover
Slide cover is too thick or thin Use a slide cover of the appropriate
thickness (0.17mm)
Slide may be upside down Turn slide over so the cover-glass
faces up
Immersion oil is on a dry objective
(especially the 40x) Check the objectives, clean if necessary
No immersion oil used with 100x
objective Use immersion oil
Air bubbles in immersion oil Remove bubbles
Condenser aperture is closed or
open too much Open or close properly
Condenser is positioned too low Position the condenser upward
Electrical Problems
Problem Cause Solution
Lamp does not light
when switched on
No electrical power Check power cord connection
Lamp bulb burnt out Replace bulb
Fuse blown out Replace fuse

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Image Problems
Problem Cause Solution
Image moves while
focusing
Specimen rises from stage surface Secure the specimen in the slide
holder
Revolving nosepiece is not in the
click-stop position Revolve the nosepiece to the click-stop position
Image tinged yellow Blue filter not used Use daylight blue filter
Lamp intensity is too low Adjust the light intensity by rotating
the intensity control dial
Image is too bright Lamp intensity is too high Adjust the light intensity by rotating
the intensity control dial
Insufficient
brightness
Lamp intensity is too low Adjust the light intensity by rotating
the intensity control dial
Aperture diaphragm closed too far Open to the proper setting
Condenser position too low Position the condenser upward
Mechanical Problems
Problem Cause Solution
Image will not focus
with high power
objectives
Slide upside down Turn the slide over so the cover
glass faces up
Cover glass is too thick Use a 0.17mm cover glass
High power
objective contacts
slide when changed
from low power
objective
Slide upside down Turn the slide over so the cover
glass faces up
Cover glass is too thick Use a 0.17mm cover glass
Diopter adjustment is not set
properly Readjust the diopter settings
Slippage of focus
when using the
coarse focusing
knob. Fine focus is
ineffective
Tension adjustment is set too low Increase the tension on the
focusing knobs
Tension adjustment is set too high Loosen the tension on the focusing
knobs