Instructions for using the oil immersion lens of a metallographic microscope
1. Find the specimen to be observed under the high-power microscope and move the part that needs to be further magnified to the center of the field of view.
2. Raise the collector to 1. Find the specimen to be observed under the high-power microscope and move the part that needs to be further magnified to the center of the field of view.
2. Raise the collector to its highest position and open the aperture to its maximum.
3. Rotate the objective lens converter. Remove the magnifying glass and add a drop of asphalt as a medium on the cover glass of the area to be observed (as the refractive index of asphalt is roughly the same as that of glass).
4. Slightly raise the lens barrel or lower the stage, rotate the objective lens converter to align the oil mirror with the light hole, and then observe the distance between the oil mirror and the specimen from the side. Slowly rotate the coarse adjustment screw to make the oil mirror contact the oil droplet, and then carefully bring it close to the surface of the cover glass. Special attention should be paid to this step, and the speed should not be too fast when adjusting. A general microscope can also directly transfer the mirror oil without lifting the mirror, and the oil mirror can be immersed in the oil droplet.
5. Observe the eyepiece with your eyes and carefully rotate the fine adjustment screw to slightly raise or lower the lens on the stage until a clear object image appears. If it is a direct conversion of the oil mirror, simply rotate the fine adjustment screw, slightly lower the lens or raise the stage, and the object image can be clearly observed. Do not use coarse adjustment spiral or continuously rotate fine adjustment spiral in one direction to lower the lens when there is no blurry image in the field of view, as this may crush the glass slide specimen or damage the lens.
After using the oil mirror, the cedar oil on the lens and slide specimen must be wiped clean. First, dip a small amount of xylene in a lens wiping paper to remove most of the oil from the lens, and then wipe it with a dry lens wiping paper. When wiping, it should be done along the diameter direction of the lens, not along the circumference of the lens. High position, aperture open to maximum.
3. Rotate the objective lens converter. Remove the magnifying glass and add a drop of asphalt as a medium on the cover glass of the area to be observed (as the refractive index of asphalt is roughly the same as that of glass).
4. Slightly raise the lens barrel or lower the stage, rotate the objective lens converter to align the oil mirror with the light hole, and then observe the distance between the oil mirror and the specimen from the side. Slowly rotate the coarse adjustment screw to make the oil mirror contact the oil droplet, and then carefully bring it close to the surface of the cover glass. Special attention should be paid to this step, and the speed should not be too fast when adjusting. A general microscope can also directly transfer the mirror oil without lifting the mirror, and the oil mirror can be immersed in the oil droplet.
5. Observe the eyepiece with your eyes and carefully rotate the fine adjustment screw to slightly raise or lower the lens on the stage until a clear object image appears. If it is a direct conversion of the oil mirror, simply rotate the fine adjustment screw, slightly lower the lens or raise the stage, and the object image can be clearly observed. Do not use coarse adjustment spiral or continuously rotate fine adjustment spiral in one direction to lower the lens when there is no blurry image in the field of view, as this may crush the glass slide specimen or damage the lens.
After using the oil mirror, the cedar oil on the lens and slide specimen must be wiped clean. First, dip a small amount of xylene in a lens wiping paper to remove most of the oil from the lens, and then wipe it with a dry lens wiping paper. When wiping, it should be done along the diameter direction of the lens, not along the circumference of the lens.
