Unitron System 274 User manual
SYSTEM 274 STEREO MICROSCOPES
UNITRON® 73 Mall Drive, Commack, NY 11725 • 631-543-2000 • www.unitronusa.com 2
CONTENTS
SAFETY NOTES .................................................................................................................. 3
CARE AND MAINTENANCE ................................................................................................ 3
INTRODUCTION .................................................................................................................. 4
UNPACKING AND COMPONENTS ..................................................................................... 4
COMPONENT DIAGRAMS ............................................................................................... 5-7
ASSEMBLY .......................................................................................................................... 8
ADJUSTMENT AND OPERATION
ADJUSTING BINOCULAR VIEWING HEAD................................................................. 15
FOCUS ADJUSTMENT................................................................................................. 16
SPECIFICATIONS.............................................................................................................. 17
TROUBLESHOOTING........................................................................................................ 17
MAINTENANCE.................................................................................................................. 18
SERVICE ............................................................................................................................ 18
WARRANTY ....................................................................................................................... 18
SYSTEM 274 STEREO MICROSCOPES
UNITRON® 73 Mall Drive, Commack, NY 11725 • 631-543-2000 • www.unitronusa.com 3
SAFETY NOTES
1. Open the shipping carton carefully to prevent any accessory, i.e. objectives or eyepieces, from
dropping and being damaged.
2. Keep the instrument out of direct sunlight, high temperature or humidity, and dusty environments.
3. 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.
4. LAMP REPLACEMENT -- CAUTION: the glass housing of the lamp may be extremely
hot. DO NOT attempt to change the lamp before it is completely cooled or without
wearing adequate skin protection.
5. All electrical connectors (power cord) should be inserted into an electrical surge protector to prevent
damage due to voltage fluctuations.
6. FUSE REPLACEMENT -- For safety when replacing the fuse (ONLY replace with the
same size, type and rating of original fuse), be sure the main switch is in the off position,
disconnect the power cord from outlet, and replace the fuse. Reconnect the power cord
and turn unit on.
7. Confirm that the input voltage indicated on your microscope corresponds to your line voltage. The
use of a different input voltage other than indicated will cause severe damage to the microscope.
NOTE: Always plug the microscope power cord into a suitable grounded electrical outlet.
A grounded 3-wire cord is provided.
CARE AND MAINTENANCE
1. Do not attempt to disassemble any component including eyepieces, objectives or the 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 bulb. If dirt
remains on the optical surface, use a soft, lint free 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.
4. Store the instrument in a cool, dry environment. Cover the microscope with the dust cover when not
in use.
5. UNITRON®microscopes are precision instruments which require periodic servicing to maintain
proper performance and to compensate for normal wear. A regular schedule of preventative
maintenance by qualified service personnel is highly recommended. Your authorized UNITRON®
distributor can arrange for this service.
SYSTEM 274 STEREO MICROSCOPES
UNITRON® 73 Mall Drive, Commack, NY 11725 • 631-543-2000 • www.unitronusa.com 4
INTRODUCTION
Congratulations on the purchase of your new UNITRON®microscope. UNITRON®microscopes are
engineered and manufactured to the highest quality standards. Your microscope will last a lifetime if
used and maintained properly. UNITRON®microscopes are carefully assembled, inspected and tested
by our staff of trained technicians in our New York facility. Careful quality control procedures ensure each
microscope is of the highest quality prior to shipment.
UNPACKING AND COMPONENTS
Your microscope arrived packed in a molded shipping carton. Do not discard the carton: the shipping
carton should be retained for reshipment of your microscope if needed. Avoid placing the microscope in
dusty surroundings or in high temperature or humid areas as mold and mildew can form. Carefully
remove the microscope from the shipping carton and place the microscope on a flat, vibration-free
surface.
COMPONENTS DIAGRAM
Ergonomic
Binocular Head
Eyepieces
Zoom Body
Auxiliary
Lens/Objective
Focus Mount
Vertical Post
Horizontal Pillar
Base
Ball Bearing
Boom Stand
Focus Knob
SYSTEM 274 STEREO MICROSCOPES
UNITRON® 73 Mall Drive, Commack, NY 11725 • 631-543-2000 • www.unitronusa.com 6
ASSEMBLY
The following photos show how to assemble the various modules in the order of assembly.
When assembling the microscope, make sure that all parts are free of dust and dirt, and avoid scratching
any parts or touching glass surfaces.
Assembling the Ball Bearing Boom Stand
1. Carefully remove all parts from box and
check for all package contents.
2. Place the base on the edge of a table as
shown below. Use the hex bolt to attach the
vertical post to the base, and tighten using
the hex wrench provided.
SYSTEM 274 STEREO MICROSCOPES
UNITRON® 73 Mall Drive, Commack, NY 11725 • 631-543-2000 • www.unitronusa.com 7
3. Place the base on the table and unscrew the
cap on the vertical post.
4. Insert the safety lock collar onto the vertical
post and tighten/lock it using the clamp.
5. Slide the horizontal pillar with cross block
into the vertical post.
6. Adjust to the desired position and tighten the
cross block on both sides using the 2 knobs.
SYSTEM 274 STEREO MICROSCOPES
UNITRON® 73 Mall Drive, Commack, NY 11725 • 631-543-2000 • www.unitronusa.com 8
7. Replace the cap back onto the vertical post.
8. Screw the lock lever on the end of the
horizontal pillar. This lock lever secures the
e-arm or focus mount.
9. Insert the e-arm or focus mount into the end
of the horizontal bar and tighten using the
lock lever.
10. Adjust the e-arm or focus mount to desired
level or position.
SYSTEM 274 STEREO MICROSCOPES
UNITRON® 73 Mall Drive, Commack, NY 11725 • 631-543-2000 • www.unitronusa.com 9
11. E-arm or focus mount can be inserted from
the TOP, BOTTOM or HORIZONTALLY of
the horizontal bar. Set e-arm or focus mount
up at various angles and tighten the lock
lever for oblique viewing.
Ball Bearing Boom Stand assembly is complete.
SYSTEM 274 STEREO MICROSCOPES
UNITRON® 73 Mall Drive, Commack, NY 11725 • 631-543-2000 • www.unitronusa.com 11
1. Attach stand clamp to work surface.
2. Attach safety collar to vertical post. Secure
with knob screw.
3. Attach moveable arm to vertical post above
safety collar. Secure to vertical post with knob
screw (left). Attach second knob screw (right),
but do not tighten.
SYSTEM 274 STEREO MICROSCOPES
UNITRON® 73 Mall Drive, Commack, NY 11725 • 631-543-2000 • www.unitronusa.com 12
4. Attach second moveable arm to first moveable
arm. Be sure to insert nylon washer over the
pin of the second moveable arm and the
receiving hole of the first moveable arm. The
washer should be between the arms to allow
articulation (refer to the parts diagram).
Secure with knob screw.
5. Attach the spring-loaded moveable arm to the
second moveable arm. Be sure to insert nylon
washer over the pin of the spring-loaded
moveable arm and the receiving hole of the
second moveable arm. Secure with knob
screw.
6. Place nylon washer over pin of spring-loaded
arm then insert into receiving hole of 3rd
moveable arm (refer to parts diagram).
Align metal washer with 2 screws holes over
screw holes in bottom of spring-loaded arm
pin. Secure the metal washer into the pin with
the 2 M3 Philips-head screws.
Attach the metal safety thumb screw onto the
bottom of the spring-loaded arm pin.
SYSTEM 274 STEREO MICROSCOPES
UNITRON® 73 Mall Drive, Commack, NY 11725 • 631-543-2000 • www.unitronusa.com 13
7. Insert drop post into 3rd moveable arm and
secure with knob screw.
8. Slide focus mount onto drop post and secure
with knob screw on the back of the focus
mount.
9. Secure the focus mount to the drop post by
threading the metal safety thumb screw into
the bottom of the drop post.
Assembly of the Articulating Arm with Vertical Extension stand is complete.
SYSTEM 274 STEREO MICROSCOPES
UNITRON® 73 Mall Drive, Commack, NY 11725 • 631-543-2000 • www.unitronusa.com 14
Mounting the Zoom Body
1. Carefully place the zoom body into the focus
mount and tighten the lock screw to secure
the zoom body in place.
2. Use caution not to over tighten the locking
screw as this may cause damage to the
instrument.
Mounting the Objective
1. Using care not to touch the lens surfaces,
carefully thread the objective into the optical
body.
Mounting the Viewing Head
1. Insert the viewing head into the optical
body and secure it into place using a
2mm Allen key to tighten the screw.
SYSTEM 274 STEREO MICROSCOPES
UNITRON® 73 Mall Drive, Commack, NY 11725 • 631-543-2000 • www.unitronusa.com 15
Installing the Eyepieces
1. Remove the dust caps from the eyepiece
tubes.
2. Insert the eyepieces into the eyepiece tube.
Be sure to install the eyepieces all the way
into the tube.
3. Set the eyepiece diopter scale for each
eyepiece to 0.
ADJUSTMENT AND OPERATION
Adjusting Binocular Viewing Head
Fig. 6
Adjusting Interpupillary Distance (Fig. 6)
Different users have different interpupillary
distances (this distance is between the centers of
the pupils of each eye). When the operator of the
microscope changes, it will be necessary to
adjust the interpupillary distance.
While looking through the eyepieces, hold the left
and right eyetubes of the viewing head and
adjust the eyetubes by opening or closing them
until the left and right fields of view coincide
completely and you are able to see a complete
circle.
Fig. 7
Adjusting Diopter Ring/Focusing (Fig. 7)
Set the diopter rings ②of both eyepieces to “0”
position. (Do this when users change, because
different users will have different diopter
settings.)
Place an easy-to-observe specimen on the stage
plate, i.e., a coin.
Rotate the zoom knob ③to the highest
magnification, and turn the focusing knob ④to
focus the specimen.
Rotate the zoom knob ③to the lowest
magnification, looking only into the left eyepiece,
adjust the diopter ring on left eyepiece to focus
the specimen. Then repeat this procedure for the
right eyepiece.
NOTE: The working
distance (the distance
between the microscope objective to the top of the
specimen) of the microscope is 186mm (with 0.5X
objective, included).
SYSTEM 274 STEREO MICROSCOPES
UNITRON® 73 Mall Drive, Commack, NY 11725 • 631-543-2000 • www.unitronusa.com 16
Focus Adjustment
Fig. 8
Fig. 9
Adjusting the Rotation Tension of the
Focus Adjustment Knob (Fig. 8, Fig. 9)
To adjust tension, hold both left and right focus
adjustment knobs ①with both hands, hold the left
knob (to prevent it from turning), and rotate the
right knob clockwise to increase (tighten) or
counterclockwise to decrease (loosen) the focus
knob tension.
After tension adjustment has been completed,
always rotate both adjustment knobs in the same
direction.
Fig. 10
Changing the Magnification
The zooming knobs located on both sides of the
zooming body (Fig. 10, black arrow) will change
the magnification of the specimen image.
Total Magnification = Magnification of zoom body
x objective x magnification of eyepiece
(i.e., 0.8 x 0.5 x 10 = 4X)
Moving the Microscope (Fig. 10)
Before moving the microscope, be sure to
remove any slide/samples. When moving the
microscope, hold the stand and base as shown in
Fig. 10 to keep it level.
SYSTEM 274 STEREO MICROSCOPES
UNITRON® 73 Mall Drive, Commack, NY 11725 • 631-543-2000 • www.unitronusa.com 17
SPECIFICATIONS
System 274
6.3:1 Parallel Zoom Body
Objective
Lens
Working
Distance
(mm)
EYEPIECE
WF 10X (Ø24mm)
Total
Magnification
Visual Field
(mm)
0.5X 186 4X-25X 60-9.6
TROUBLESHOOTING
Under certain conditions, performance of this unit may be adversely affected by factors other than
defects. If a problem occurs, please review the following list and take remedial action as needed. If you
cannot solve the problem after checking the entire list, please contact your local dealer for assistance.
Trouble Cause Remedy
Double images Interpupillary distance is not correct Readjust it – page 12
Diopter adjustment is not correct Readjust it – page 12
Dirt appears in the view field Dirt on the specimen Clean specimen
Dirt on the surfaces of eyepieces Clean eyepieces
Image is not clear Dirt on the surface of objectives Clear objectives
Image is not clear while focusing
change
Diopter adjustment is not correct Readjust diopter – page 12
Focusing is not correct Readjust it – page 12
The focusing knob is not smooth The focusing knob is too tight Loosen it to a suitable position
– page 13
The image is obscure because of the
head slipping down during
observation
The focusing knob is too loosen Tighten it to a suitable position
– page 13
SYSTEM 274 STEREO MICROSCOPES
UNITRON® 73 Mall Drive, Commack, NY 11725 • 631-543-2000 • www.unitronusa.com 18
MAINTENANCE
Please remember to never leave the microscope with eyepieces removed and always protect the
microscope with the dust cover when not in use.
SERVICE
UNITRON®microscopes are precision instruments which require periodic servicing to keep them
performing properly and to compensate for normal wear. A regular schedule of preventative maintenance
by qualified service personnel is highly recommended. Your authorized UNITRON®distributor can
arrange for this service. Should unexpected problems be experienced with your instrument, proceed as
follows:
1. Contact the UNITRON®distributor from whom you purchased the microscope. Some
problems can be resolved simply over the telephone.
2. If it is determined that the microscope should be returned to your UNITRON®distributor or to
UNITRON®for warranty repair, pack the instrument in its original Styrofoam shipping carton. If you no
longer have this carton, pack the microscope in a crush-resistant carton with a minimum of three inches
of a shock absorbing material surrounding it to prevent in-transit damage. The microscope should be
wrapped in a plastic bag to prevent Styrofoam dust from damaging the microscope. Always ship the
microscope in an upright position; NEVER SHIP A MICROSCOPE ON ITS SIDE. The microscope or
component should be shipped prepaid and insured.
LIMITED MICROSCOPE WARRANTY
This microscope is warranted to be free from defects in material and workmanship for a period of five (5) years for
mechanical and optical components and one (1) year for electrical components from the date of invoice to the original
(end user) purchaser. This warranty does not cover damage caused in-transit, misuse, neglect, abuse or damage
resulting from improper servicing or modification by other then UNITRON® approved service personnel. This
warranty does not cover any routine maintenance work or any other work, which is reasonably expected to be
performed by the purchaser. Normal wear is excluded from this warranty. No responsibility is assumed for
unsatisfactory operating performance due to environmental conditions such as humidity, dust, corrosive chemicals,
deposition of oil or other foreign matter, spillage or other conditions beyond the control of Unitron Ltd. This warranty
expressly excludes any liability by Unitron Ltd. for consequential loss or damage on any grounds, such as (but not
limited to) the non-availability to the End User of the product(s) under warranty or the need to repair work processes.
Should any defect in material, workmanship or electronic component occur under this warranty contact your
UNITRON® distributor or UNITRON® at (631) 543-2000. This warranty is limited to the continental United States of
America. All items returned for warranty repair must be sent freight prepaid and insured to Unitron Ltd., 73 Mall Drive,
Commack, NY 11725 – USA. All warranty repairs will be returned freight prepaid to any destination within the
continental United States of America. For all foreign warranty repairs, return freight charges are the responsibility of
the individual/company who returned the merchandise for repair.
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