Instructions for Using the Low-Power Objective of a Metallographic Microscope
1. Metallographic microscope for light
Rotate the coarse adjustment screw with your left hand to raise the lens barrel or lower the stage, then rotate the objective lens converter to align the low magnification mirror with the through hole of the stage (pay attention to aligning the notch above the objective lens with the fixed buckle of the base when rotating), open the aperture, rotate the lifting screw of the light collecting mirror to make the lens plane at the top of the light collecting mirror slightly lower than the height of the stage plane, open both eyes at the same time, and adjust the direction of the reflector until the light in the field of view is uniform and the brightness is moderate.
2. Place glass slide specimens under a metallographic microscope
Take a glass slide specimen and place it on the stage, with the cover glass facing upwards. Fix it on the pusher and then manually rotate the pusher screw to align the specimen to be observed with the center of the light hole.
3. Adjust the focal length of the metallographic microscope
Rotate the coarse adjustment screw by hand to make the distance between the low magnification mirror and the slide specimen less than 6mm (when adjusting, the distance between the objective lens and the slide must be observed from the side, and do not rotate the coarse adjustment screw while observing with the eyes on the eyepiece to prevent damage caused by the lens colliding with the slide). Then open both eyes at the same time, slowly rotate the coarse adjustment screw by hand to raise the lens or lower the stage. When an object image appears in the field of view, adjust the fine adjustment screw until a clear object image appears in the field of view. If the object image is not in the center of the field of view, the position of the slide specimen can be moved up, down, left, and right (note: the direction of fragment movement is opposite to the direction of the observed object image movement). If the distance between the lens and the specimen exceeds the working distance and no object image is seen when adjusting the focal length, the above steps should be strictly followed again.
