Place the instrument in the middle of the two fixed points, mark the horizontal line of two points, called a, b line, move the instrument to the fixed point end, and mark the horizontal line of two points, called a', b '. To calculate if ab≠a'-b ', align the telescope horizontal wire with a value that is half the deviation. Use the calibration pin to adjust the upper and lower screws of the level to make the tube horizontally match. Repeat the above steps until they are equal.
1.5 dew point instrument maintenance and repair
1.5.1 Dew point meter is a precision optical instrument. Correct and reasonable use and storage have a great effect on the accuracy and life of the instrument;
1.5.2 Avoid direct sunlight, and disassemble the instrument without permission;
1.5.3 Each fine adjustment should be turned gently, do not use too much force. Lenses and optical sheets are not allowed to touch the sheet by hand;
1.5.4 The instrument is faulty and is repaired by the person familiar with the structure of the instrument or the repair department;
1.5.5 After each use, wipe the instrument clean and keep it dry.
1.6 Note:
1.6.1 When standing on a ruler, stand behind the leveling ruler and use both hands to keep the ruler upright;
1.6.2 Front and rear line of sight can be approximated by the number of steps, so that the front and rear line of sight are roughly equal;
1.6.3 Before reading the reading, the light should be carefully corrected to eliminate the parallax;
1.6.4 The roughing should not be carried out during the observation process. If the bubble of the circular level is deviated, the instrument should be leveled and re-observed; every reading should be leveled;
1.6.5 After the measurement is completed, it should be checked immediately. Once the error exceeds the limit, it should be re-tested immediately.
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