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BLACK/WHITE PLATE.  SUCH DAMAGE WILL NOT BE COVERED BY WARRANTY.  It is 
acceptable to leave the glass plate in place for most viewing purposes. 

The black/white contrast plate can be used when viewing opaque objects or for dissecting.  Choose 
side of plate providing best contrast with specimen.  Remember, do not use bottom light with this 
plate in place. 

INTERPUPILLARY ADJUSTMENT 

This permits each user to adjust spacing between eyepieces in order to accommodate distance between 
their eyes.  Observe that each eyepiece tube on each side of microscope head is mounted on its own 
gray metal housing.  While looking through microscope, use both hands to firmly grasp gray metal 
housing and gently pull or push the sides in a horizontal path until images viewed through both eyepieces 
appear as one and field of view appears as one circle of light. 

FOCUSING 

1.

Place object or specimen slide in center of stage plate.

2.

The viewing head is mounted on a post, and height of head can be adjusted up or down on post in
order to focus on difference sized specimen.  Loosen the post locking knob located on back of focus
block so that viewing head can move freely up or down on post.

3.

While looking through microscope, move head up or down on post until image is in approximate
focus.  Tighten post locking knob.  It is not necessary to make this adjustment every time you change
objects being viewed, unless there is a significant difference in thickness or height of objects.

4.

Rotate focusing knobs with both hands until specimen comes into sharp focus in right side of
microscope.

5.

Because most people have some difference in vision between the left and right eye, your microscope
is equipped with a diopter adjustment on the left eyepiece to compensate for this difference and
assure that you will see one corrected image when looking through microscope.

Observe that the knurled diopter ring on the left eyepiece tube can be rotated to move the eyepiece
up or down slightly.  When a silver ring on the eyepiece tube is visible just below the diopter ring, the
focus of both sides of microscope is matched for 20/20 vision.

If you do not have 20/20 vision, turn knurled diopter ring until left side of microscope is also in sharp
focus.  Left and right images should now blend into one focused image.  The microscope is now
adjusted for your vision, and no further adjustment of the diopter should be required.  Only the
focusing knobs will require further adjustment when viewing objects of different thickness.

Summary of Contents for 400

Page 1: ...strument Inc 6508 Tri County Parkway Schertz Texas 78154 Phone 210 590 9010 Fax 210 590 1104 INSTRUCTIONS FOR STEREOSCOPIC MICROSCOPES MODEL NUMBERS 400 400TL 400TBL 405TBL Copyright 1 2 01 National Optical Scientific Instrument Inc ...

Page 2: ...ective lens Incidental top illumination included on all models except 400 Stage clips Stage plate Base Illustrated is 400TBL having both incidental top and transmitted bottom illumination Fuse Light control switches Power switch 405TBL series has 45 inclined head Plain base on non illuminated 400 Base on top illuminated 400TL ...

Page 3: ... plate 60mm diameter already mounted in the base of microscope Install rubber eyepiece shields over top of eyepieces with the flared portion of the shields positioned at the outside edge of eyepieces Observe that the main voltage of your microscope is labeled on the back of the base Make certain that the main voltage of your microscope corresponds to the voltage of your power outlet Examine packin...

Page 4: ...in a clockwise direction b Insert penlight into black rubber lined friction mounting port located immediately behind head of microscope 3 Determine whether the black or white side of the stage plate will provide best contrast with the specimen to be viewed The white side will be used for most viewing It will always be required when viewing transparent specimen slides because it better reflects lig...

Page 5: ...ely up or down on post 3 While looking through microscope move head up or down on post until image is in approximate focus Tighten post locking knob It is not necessary to make this adjustment every time you change objects being viewed unless there is a significant difference in thickness or height of objects 4 Rotate focusing knobs with both hands until specimen comes into sharp focus in right si...

Page 6: ...es Only one of these holes contains a small set screw Using a small jewelers screwdriver loosen this set screw Your microscope was supplied with a small pin spanner wrench having one prong Insert pin of the wrench into one of the holes turn collar clockwise to tighten tension counter clockwise to loosen tension In the event you have misplaced the wrench a large rubberband placed around the collar ...

Page 7: ... drops from its own weight Adjust tension control Poor resolution image not sharp Objective lenses dirty Clean objective lenses Eyepiece lens dirty Clean eyepiece lenses Spots in field of view Eyepiece lens dirty Clean eyepiece lenses Spots in field of view can also result from dirt on inside of eyepiece It is recommended that you have service technician clean inside of lens OPTIONAL ACCESSORIES A...

Page 8: ... WARRANTY 5 YEAR LIMITED WARRANTY Please see our website www nationaloptical com for complete warranty details and exclusions Revised 1 13 10 www microscopeworld com info microscopeworld com 800 942 0528 ...

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