17
2.
Lightly move lens so that drone is at center of eyepiece visual field.
3.
Make 3-dot mark using dot-making mechanism.
4.3.2
Calibration of Cylindrical Lens
1.
Turn astigmatism turning hand-wheel to show required angle on the liquid
crystal display screen.
2.
Turn diopter measuring hand wheel to obtain distinct focus of round dot
drone when SPH (spherical degree) is a big value.
3.
Turn lens so that 3 long green lines of round dot drone and cross-line drone
are parallel.
4.
Lightly move lens so that drone is at center of eyepiece visual field.
5.
Make 3-dot mark using dot making mechanism.
4.3.3
Calibration of Prism Lens
1.
Turn astigmatism turing hand-wheel to show required angle on the liquid
crystal display screen.
2.
Turn diopter measuring hand wheel to obtain distinct focus of drone.
3.
Move lens or use prism compensator so that the middle one of 3 long green
lines of cross-line drone passes through center of eyepiece visual field.
4.
Make 3-dot mark using dot making mechanism.
4.3.4
Calibration of Optic Center of Assembled Two Lens
Put spectacles on the device. Choose any one of lens, and turn diopter measuring
hand wheel to enable focus of drone to be clearest and at center of eyepiece
visual field. Make central print-mark on this lens using dot making mechanism.
Repeat the operation to make central print mark on another lens. By the use
of vernier caliper, measure space between central print marks of two lenses.
4.4 Function of Automatic Dormancy
This device stops working for some 3 minutes. The auto-stop function: The lamp
at this time is not lighted, and device comes into a State of low consumption
