Operating Precautions of Metallographic Microscopes
(1) Extra caution must be exercised during operation. No violent movements are allowed. Do not disassemble the optical system without permission.
(2) Never touch the glass surface of microscope lenses or the polished surface of specimens with bare fingers. If dust accumulates on the lens, it will reduce the clarity and resolution of the microscope. In this case, blow away dust and grit with an air blower first, then gently wipe with lens paper or a soft brush to avoid scratching the lens glass during direct wiping, which would impair performance.
(3) Never plug the microscope bulb (6~8V) directly into a 220V power outlet. It must be connected to a transformer; otherwise the bulb will burn out immediately. Switch off the power promptly after observation.
(4) Rotate the coarse (or fine) focusing knob slowly. Stop operation immediately if resistance is encountered and report to the instructor to identify the cause. Do not force the knob, or mechanical components may be damaged.
3. Metallographic Microscope Instrument
To maintain effective performance under normal operating conditions, proper operation and regular maintenance are required. The following maintenance requirements are provided for reference.
(1) The instrument shall be stored in a well-ventilated and relatively dry location. Avoid extreme cold or heat and exposure to corrosive gases. Do not store it together with chemicals (desiccants excluded). Cover and wipe the instrument clean after use. When not in use, remove specimens (slides) in a timely manner, clean the lenses with lens tissue, turn the objective lenses into a figure‑8 position, and lower and lock the lens barrel to prevent collision between objective lenses and condenser lenses. Place the microscope into its wooden case and store it in a dry and ventilated area. If possible, take the instrument and accessories out of the wooden case on dry, fine days at regular intervals and leave them indoors in a spacious, dry and well‑ventilated area for 2–3 hours of airing. After operation under high-temperature conditions, pay attention to the storage temperature. A sharp temperature difference may cause moisture condensation on the instrument if stored right after use, which can lead to damp damage.
