accordingly
5.8 Adjusting aperture diaphragm
Adjust the aperture diaphragm adjusting shaft for condenser till the position which stands for the
magnification of objective
﹡
adjust the aperture diaphragm
5.8.1 Adjust the aperture diaphragm by the adjusting shaft. The brightness and resolution will be
decrease while the contrast and depth of view will increase if the diameter of aperture
diaphragm reduces
5.8.2. Adjust the value of aperture diaphragm to 70%
～
80% of the value of objective’s N.A.
5.8.3 The aperture diaphragm could control the N.A. of condenser. Do not adjusting the brightness by
it while use the brightness adjusting knob to make the adjustment
5.8.4 N.A. is marked in each objective
e.g. 40X/0.65 stands for that magnification is 40X and N.A. is 0.65
5.8.5 Remove the eyepiece and observe through the eye tubes by eyes directly
N.A. of condenser could tell users the position of aperture diaphragm adjusting shaft in
corresponding magnification. (That is to say, the value of aperture diaphragm should be 70% to
80% of the N.A. of objective when the aperture diaphragm adjusting shaft reaches some
position) If the objective has been changed, please move the shaft to the position with the same
value which is in the objective in the optic path and this will make ideal contrast
5.9 Observing with oil immersion
There is “oil” marked in the oil immersion objective. Please use the oil immersion supplied by the
manufacturer between the objective and cover glass
5.9.1 Operation
5.9.1.1 Condenser
Remove the slide back and fall the condenser down
a little. One drop of oil could be placed in the top of condenser by through
the long aperture of stage. Then move the slide forward and lift the condenser
up
5.9.1.2 Objectives
Turn the nosepiece and take the objective out of the
optic path. Place one drop of oil on the slide then turn the condenser slowly
and mount the objective
5.9.2 Air bubble in oil immersion
5.9.2.1 Never make the oil immersion into your eyes. Please take following steps as soon as the
oil immersion touches your skin or eyes
Use soap or clean water to wash your skin carefully
Please wash your eyes with clean water (at least wash 15 minutes) and go to the
hospital at once
5.9.2.2 Do not expose the oil immersion in the sun or ultraviolet radiation directly
