Interpupillary Adjustment - National 400 Instructions Manual

BLACK/WHITE PLATE.
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.
SUCH DAMAGE WILL NOT BE COVERED BY WARRANTY.
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