The correct placement of the instrument

The focal meter is a precision photoelectric measuring instrument, and it should be handled with care during use and verification to avoid damage or displacement of optical components caused by strong vibration or impact. The lens meter should not be placed in direct sunlight or in humid and dusty places, otherwise it will affect normal use. The instrument needs to be used under constant temperature conditions to ensure the accuracy and stability of the measurement data.

Correct operation of the instrument

When performing the verification of the focus meter, it should be plugged in and warmed up for a period of time. Before placing the lens under test, the display readings of the spherical power, cylinder power and prism power should all be zero. If the above-mentioned reading display appears before the lens is placed, check and deal with it before performing the verification, otherwise it will affect the normal progress of the verification work. During the verification process, you should develop good operating habits, handle with care, and use no gravity during operation, so as not to cause mechanical damage to the instrument, thereby reducing its service life. Do not switch the power on and off frequently during use, it is best to use the screen saver function. It is recommended to select the 20-minute automatic power-off function. When the instrument enters the protection state, press any key to automatically power on and use.