Operation - National 205-RLED 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.
2. Assure that light is available for illuminating the specimen.
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.
c. In case of equipment malfunction, see troubleshooting procedures located at the back of this manual.
3. Rotate coarse focus knobs to move stage down (away) from objective lens as far as possible.
4. Place specimen slide, cover slip facing up, on stage with specimen centered over condenser lens in
middle of stage.
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. Rotate disc diaphragm until largest aperture is positioned beneath condenser in center of stage.
7. Turn 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.
8. 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.
9. Adjust fine focus controls until specimen is in sharp focus.
WARNING
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