National 211 Instructions Manual page 3

For optimum viewing satisfaction, follow these simple procedures. Nomenclature used to describe components and
controls can be identified by referring to the diagram at left.
UNPACKING
The microscope and accessories have been carefully packed to assure they reach you in the best possible condition.
Examine packing material before you discard it.
or return the microscope for repairs. Always handle and move microscope by securely holding the arm of microscope.
Avoid touching any of the lens surfaces while handling the microscope. Dust, dirt, or fingerprints can damage the delicate
lens surfaces or adversely affect image quality.
Model 211/211-RLED: Stand with head, one WF10x eyepiece, 4x, 10x and 40x objectives, condenser, specimen holder,
dustcover, 2mm "L" hex wrench (for rack stop adjustment), 0.90mm "L" hex key wrench (for eyepiece socket set screw,
tension adjustment collar and for lamp replacement), auto cut-off recharger (RLED only).
Model 212/212-RLED: Stand with head, one WF10x eyepiece, 4x, 10x, 40x and 100x objectives, condenser, specimen
holder, dustcover, 2mm "L" hex wrench (for rack stop adjustment), 0.90mm "L" hex key wrench (for eyepiece socket set
screw, tension adjustment collar and lamp replacement), auto cut-off recharger (RLED only).
DESCRIPTION OF COMPONENTS
1. EYEPIECE (ocular lens) Lens closest to the eye, magnifies the primary image formed by the objective lens. The
eyepiece is equipped with a "pointer" that rotates as the eyepiece is turned.
2. OBJECTIVE TURRET (nosepiece) Revolving turret which holds objective lenses, permits changes of magnification by
rotating different powered objective lenses into optical path.
3. OBJECTIVE LENS
4. MECHANICAL STAGE
5. STAGE Platform of the microscope where the specimen slide is placed.
6. CONDENSER LENS
substage illumination and fills the back lens element of objective lens to improve image resolution.
7. IRIS DIAPHRAGM
lens. Larger apertures used for higher magnifications, and smaller apertures used for lower magnifications. Iris is
protected by a frosted glass covering.
8. FILTER HOLDER
be removed from optical path when using 40x and 100x objective lens.
9. SAFETY RACK STOP
objectives from breaking specimen slides, prevents damage to objective lenses. This stop has been pre-adjusted at
the factory.
10. FOCUSING KNOBS
specimen image into focus. Fine focus knobs (smaller knobs) located on each side of arm permit more precise image
adjustment.
11. ILLUMINATION:
211 and 212: Built-in substage electric LED illuminator provides constant, reliable, pre-focused illumination equal to a
20-watt tungsten bulb.
211-RLED and 212-RLED: Built-in substage electric LED illuminator provides constant, reliable, pre-focusing
illumination equal to a 20 watt tungsten bulb. Powered by 3 rechargeable AA nickel metal hydride batteries, no power
outlet or electrical cord are needed.
ASSEMBLY
1. Specimen holder:
a. Rotate coarse focusing knob to move stage platform to its lowest position.
b. Remove two knurled screws from mechanical stage platform.
c. Place specimen holder on stage and using the two knurled locking screws, attach specimen holder to mechanical
stage
Lens closest to the object being viewed, forms first magnified image of the specimen.
Permits precise, mechanical manipulation of the specimen slide.
1.25 N.A. Abbe condenser lens positioned under center of stage, condenses light rays from
Iris opening is controlled by lever, designed to help achieve optimum resolution of the objective
Attached to bottom of iris diaphragm with swing out built in neutral filter. Swing out filter should
When properly adjusted, controls maximum upward travel of stage. Prevents higher power
Coarse focusing knobs (larger knobs) located on each side of arm, raise or lower stage to bring
Retain the styrofoam container in case you need to transport, store
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