Leica Auto Level Settings with complete Detail.
How Automatic Levels Work
A brief overview of the how automatic levels work and key components may be helpful to many buyers. With the development of the automatic level technology more than fifty years ago and the widespread availability and the low cost that has emerged over the last twenty years (due to the design and manufacturing improvements and economies of the scale), accurate levelling is not so dependent on the instrument operator skill, as the inherent errors in manual bubble levelling are virtually eliminated. With the quality auto levels, the user closely levels both axes (with-in the level’s compensation range) with the circular bubble vial, and the instrument then adjusts to the automatically establish level and maintain level during use.
The key to an automatic level is compensator, where gravity is used to suspend part of the instrument optics vertically. the Auto levels use a standard sighting telescope, but the light entering the objective lens passes through the mechanical compensator system before reaching the user’s eye. Conpensator’s often consist of the prism suspended with very fine wires so that plumb is established and the light passing through the prism is set to plumb. In the order to speed the process of auto-levelling, which can only happen when the compensator coming to rest in the vertical position, the damping device is employed to rapidly stop the suspended compensator from swinging and to the compensate for possible image-impacting resonance (from wind forces on the instrument and the tripod or ground vibration) in order to maintain stable sighting through the cross hairs. Both magnetic and air damping of the compensator element are commonly used, with the air type required when used in areas with external magnetic interference. While the compensator and damping components in the all auto levels share the same principles, there are differences in the quality that influence precision and reliability.
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Auto Level Setup,
1. Setup your tripod as level as possible, step on the tripod legs to drive into the ground.
2. Attach auto level to the tripod.
3. Adjust level so bubble is centered in the vial.
4. Adjust recital until cross-hairs are clear.
5. Adjust the objective lens until object you are sighting on is clear.
Care of Auto Levels.
If the instrument becomes wet leave it unpacked. Wipe down instrument, clean and dry transport case. Pack up instrument only when it is the perfectly dry. Never touch the glass with fingers, use soft clean lint-free cloth to the clean lens.
Checking the Auto Level Accuracy,
1. The Set up instrument in an area that is as level as possible & which is about 220 feet long. Place 2 matching level rods or 2 pieces of strapping in the ground about 2 hundred feet apart with the faces toward each other. Position and level the instrument so that the distance from the instrument to each rod is same measure.
2. Take the reading on each rod with the instrument (or mark each piece of the strapping where the cross-hair is sighted).
3. Move transit to the another spot on the line and take readings and mark both rods again.
4. The difference between the marks on the rod will be the error of the instrument. The error needs to be corrected by the competent repair technician.
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