Failure analysis and repair of microscopes and microscope systems
Checking method
Place the standard scale in the hardness tester (or microscope) on the working table, check the focus, so that in the eyepiece field of view or projection screen can clearly see the standard scale of the engraved line, and adjusted to the eyepiece and the engraved line in the overlap, and then read the microscope's engraved line and the standard scale of the engraved line to compare, should be at least in the entire measurement range of 5 intervals for measurement, the interval comparison of the section 3 times, take the The relative error W is calculated according to the following formula: W=(Li-L)/(Li-L)/(Li-L)/(Li-L)/(Li-L)/(Li-L).
W=(Li-L ) /L×100%.
Where : W - relative error (mm); Li - reading microscope comparison of the length of the section measured (mm), (i = 1 ~ 5); L - the standard scale comparison section the actual length (mm) of the comparative segment of the standard scale.
The scale of the reading microscope is compared segment by segment according to the above method, and its error should be no more than ± 0.5%.
Failure analysis and maintenance
1. Microscope turbid and unclear
The main reason: unclean or mouldy lenses.
Elimination method: when there is dust or dirt on the lens, the application of brush, feather removal, followed by lens paper or with a little anhydrous alcohol dipped in cotton wool carefully wiped along the ring track, but do not let the wipe liquid loss.
2. The edge of the indentation can not be clearly seen in the mirror
Main reason: part of the lens has a loose phenomenon.
Elimination method: re-fasten the lens loosening place.
3. reading microscope scale value and the standard ruler scale does not coincide with
The main reason: the objective lens is loose or the objective lens and the barrel of the lens connection washer loss, focal length changes caused by.
Elimination method: the objective lens is fastened, if the gasket is lost, should be repeatedly debugging its thickness, with the appropriate gasket
Circle, to the position of the smallest scale error.
4. reading microscope scale value than the standard scale
The main reason: the growth of the barrel, may be loose barrel connector.
Elimination method: re-tighten the lens barrel joint.
Reading microscope should always keep clean, long-term use, can be placed in a dry box to prevent the occurrence of mould. The use of the process should be gently held and put, so as to avoid damage to the microscope, affecting the accuracy of measurement and service life.
