Operation - National 211 Instructions Manual

OPERATION

1. Place microscope directly in front of you in a manner which permits you to comfortably look into the eyepiece. Note
that the head of microscope rotates 360º, permitting you to operate the microscope from the front or from the back,
whichever is most convenient for you. It also permits convenient sharing of microscope by more than one user, by
simply rotating head, without needing to move entire microscope. Most users will position the microscope with the arm
facing them so that focusing knobs are most convenient to reach.
2. Assure that light is available for illuminating the specimen.
211 and 212 Lighting Operation:
a. Make certain that the main voltage of your microscope corresponds to the voltage of your power outlet, 120v AC.
Insert plug into matching voltage output.
b. Push rocker switch located at rear of base to ON position.
c. In case of equipment malfunction, see troubleshooting procedures located at the back of this manual.
211-RLED and 212-RLED Lighting Operation:
a. Your microscope has special LED illumination that is powered by 3 rechargeable AA nickel metal hydride batteries
(supplied). These batteries may be recharged, as required, using the recharger (supplied). Each set of batteries
may be recharged approximately 500 times before replacing, and each charge will provide up to 50 hours of
microscope operation. The LED component (bulb) will last for up to 50,000 hours before replacement is required.
DO NOT USE regular AA alkaline batteries. Use of other than rechargeable AA nickel metal hydride
batteries could result in batteries exploding during recharge. ONLY USE THE SUPPLIED SWITCHING
BATTERY RECHARGER WITH AUTOMATIC "TRICKLE CHARGE".
b. It is recommended that you charge the batteries before initial use and after prolonged storage as the batteries may
have discharged. Plug output cord from battery charger into DC recharging socket located on back of microscope
base. Your automatic switching recharger operates on 100 to 240 volts AC 50/60 Hz. Plug recharger into your AC
wall outlet. Battery recharger is also equipped with an automatic "trickle charge" feature, the red LED indicator
lamp located on recharger will be illuminated when batteries are receiving maximum charge. After batteries are
charged, the red LED indicator lamp will turn to green and charger automatically switches to "trickle charge". The
charger can be left plugged in, but for safety reasons it is a good idea to disconnect the charger from the AC wall
outlet and the output cord from recharging socket after 12 hours. Batteries and charger may feel warm when
charging, and unplugging the recharger is a safety precaution.
Note that your microscope can be used during recharging. Simply turn "on/off" switch on back of microscope
base to "on" position and proceed as follows.
2. Rotate coarse focus knobs to move stage down (away) from objective lens as far as possible.
3. Position the objective turret until the 4x (smallest) objective lens "clicks" into position in the optical path. Note that
each time you change from one objective lens to another you should turn the turret until you hear the "click", which
indicates that the lens is properly indexed in the optical path.
4. Swing moveable finger on slide holder outward. Place specimen slide (cover slip up) on top of stage surface against
fixed side of slide holder. Slowly release moveable finger until it makes contact with specimen slide.
5. Turn rheostat (dimmer) control in direction to reduce illumination brightness to about mid-point. Normally, brightness
will need to be reduced as magnification is reduced, and increased as magnification is increased. Experiment with this
adjustment until optimum resolution and contrast of specimen is obtained.
6. Locate lever beneath stage that controls the iris diaphragm. Move lever until iris diaphragm is about half open.
Normally, aperture of iris should become smaller for lower magnifications and larger for higher magnifications.
Experiment with this setting until optimum resolution and contrast of specimen is obtained.
7. While looking through the eyepiece, rotate coarse focusing knobs until specimen comes into focus. If image does not
appear in field of view, move specimen slide slightly until image appears in field of view.
8. Adjust fine focus controls until specimen is in sharp focus.
WARNING
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