The functions of each part of the 4X metallographic microscope and a brief introduction to its use
Lighting system: There is a low-voltage (6-8V, 15V) bulb in the base as a light source, which is powered by a transformer step-down, and the brightness of the light is changed by adjusting the secondary voltage (6-8V). The spotlight, aperture diaphragm and reflector are installed on the circular base, and the field diaphragm and another condenser are installed on the bracket. They constitute the illumination system of the microscope, so that the surface of the sample can be fully and uniformly illuminated. .
Microscope focusing device: There are coarse and fine focus handwheels on both sides of the microscope, both of which are in the same position. With the rotation of the coarse adjustment handwheel 6, the curved arm supporting the stage moves up and down. There is a braking device on one side of the coarse adjustment hand wheel, which is used to fix the position of the stage after the focus is correct. Fine-tuning the handwheel 5 makes the microscope object move slowly along the rail. There are graduated scales engraved on the right handwheel, and each scale indicates the slight movement of the objective lens holder up and down by 0.002mm. There are two white lines engraved on the gear box on the same side as the dial to indicate the micro-motion lifting range. When it is turned to the limit position, the micro-handwheel will be automatically restricted. At this time, it cannot continue to rotate but should be reversed. to use.
Stage: It is used to place metallographic samples. There is a guide rail between the stage and the lower tray. Pushing it by hand can make the stage move in a certain range of cross orientation on the horizontal plane to change the observation position of the sample.
Aperture diaphragm and field of view diaphragm: The aperture diaphragm is installed on the lighting reflector seat, adjusting the aperture diaphragm can control the thickness of the incident light beam to ensure the clearness of the object image. The field of view diaphragm is located under the objective lens bracket, and its function is to control the field of view, so that the field of view in the eyepiece is bright without shadows. There are also two adjustment screws on the ferrule engraved with the rule to adjust the center of the diaphragm.
Objective lens converter: The converter is spherical and has three screws on it, which can be used to install objective lenses of different magnifications. Rotating the converter allows each objective lens to enter the optical path. It can be used with different eyepieces to obtain various magnifications.
Eyepiece tube: The eyepiece tube is installed on a hemispherical seat with a prism inclined at 45 degrees, and the eyepiece can also be turned 90 degrees to be horizontal to cooperate with the camera device for metallographic photography.
A metallographic microscope is a precision optical instrument that requires care and caution when used. Before working with a microscope, you must first be familiar with its structural features and the mutual position and interaction of each major component, and then operate in accordance with the microscope's operating procedures.
Instructions for use of metallographic microscope:
1) First, insert the light source plug of the microscope into the transformer, and connect the power supply through the low-voltage (6-8V) transformer.
2) Select the required objective lens and eyepiece according to the magnification, install them on the objective lens holder and inside the eyepiece tube respectively, and turn the converter to a fixed position.
3) Place the sample in the center of the sample table, put the observation side down and press it down.
4) Turn the coarse adjustment handwheel to lower the stage first, and at the same time observe with your eyes to make the objective lens as close as possible to the surface of the sample (but do not touch it), then turn the coarse adjustment handwheel in the opposite direction to make the stage rise gradually To adjust the focal length, when the brightness of the field of view increases, use the fine-tuning handwheel to adjust until the object image becomes clear.
5) Properly adjust the aperture diaphragm and field diaphragm to obtain the best quality image.
