National 211, 212, 211-RLED, 212-RLED Instructions Manual

MODELS 211-RLED & 212-RLED (Rechargeable Cordless)

National Optical & Scientific Instruments Inc.

6508 Tri-County Parkway

Schertz, Texas 78154

Phone [phone] Fax [phone]

INSTRUCTIONS FOR

MODELS 211 & 212 (Corded)

COMPOUND MICROSCOPES

Copyright © 1/14/2013

National Optical & Sc i ent i fic Instrument I nc.

Eyepiece (ocular lens)

Eyepiece tube

Head of microscope

Arm

(nosepiece)

Iris diaphragm lever

Stage

Illuminator field

Base

Coarse focus

Fine focus knob

Rheostat control

Tension adjustment

On/Off switch

Swing-out filter holder

Rack stop set screw

Specimen holder

(mechanical stage)

Objective turret

Objective lens

Condenser lens

and fuse holder

(back of base)

knob

lens housing

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. Retain the styrofoam container in case you need to transport, store
or return the micros cope 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 Lens closest to the object being viewed, forms first magnified image of the specimen.

4. MECHANICAL STAGE Permits precise, mechanical manipulation of the specimen slide.

5. STAGE Platform of the microscope where the specimen slide is placed.

6. CONDENSER LENS 1.25 N.A. Abbe condenser lens positioned under center of stage, condenses light rays from
substage illumination and fills the back lens element of objective lens to improve image resolution.

7. IRIS DIAPHRAGM Iris opening is controlled by lever, designed to help achieve optimum resolution of the objective
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 Attached to bottom of iris diaphragm with swing out built in neutral filter. Swing out filter should
be removed from optical path when using 40x and 100x objective lens.

9. SAFETY RACK STOP When properly adjusted, controls maximum upward travel of stage. Prevents higher power
objectives from breaking specimen slides, prevents damage to objective lenses. This stop has been pre-adjusted at
the factory.

10. FOCUSING KNOBS Coarse focusing knobs (larger knobs) located on each side of arm, raise or lower stage to bring
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

3