Maintenance and Problem-Solving for Microscopes
1. Verification method Place the standard reticle on the workbench of the hardness tester (or microscope), and adjust the focus first when checking, so that the reticle of the standard reticle can be clearly seen in the field of view of the eyepiece or on the projection screen , and adjust to coincide with the reticle in the eyepiece, then compare the reticle of the reading microscope with the reticle of the standard reticle ruler, and measure at least 5 intervals of the entire measurement range, and compare each interval 3 times , get the mean value of 3 comparison results, and its relative error W is calculated according to the following formula:
W=(Li-L)/L×100%
In the formula: W——relative error (mm); Li——the length (mm) measured by the comparison section of the reading microscope, (i=1～5); L——the actual length of the comparison section of the standard ruler ( mm).
The scale of the reading microscope is compared step by step according to the above method, and the error should not be greater than ±0.5%.
Second, failure cause analysis and maintenance
1. The microscope is cloudy
The main reason: the lens is dirty or moldy.
Remedy: When there is dust or dirt on the lens, use a brush or feather to remove it, and then use lens paper or absorbent cotton dipped in a little absolute alcohol to carefully wipe along a circular path, but do not let the wiping liquid drain.
2. The edge of the indentation cannot be clearly seen in the mirror
The main reason: some lenses are loose.
Remedy: Re-tighten the loose part of the lens.
3. The scale value of the reading microscope does not coincide with the scale of the standard scale
The main reason: the objective lens is loose or the gasket at the connection between the objective lens and the lens barrel is lost, and the focal length changes.
Troubleshooting method: fasten the objective lens, if the gasket is lost, its thickness should be adjusted repeatedly, and a suitable gasket should be added until the position where the scale error is the smallest.
4. The reading microscope scale value is larger than the standard scale scale
The main reason: the lens barrel grows, it may be that the lens barrel joint is loose.
Remedy: re-tighten the lens barrel connector.
The reading microscope should always be kept clean. If it is not used for a long time, it can be placed in a dry box to prevent mildew. Handle with care during use to avoid damage to the microscope and affect measurement accuracy and service life.
