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Which of the following is an INCORRECT feature of the auto level instrument, used for levelling?
The auto level works on the compensator mechanism.
Readings on the staff are taken manually.
Initially, the instrument should be levelled roughly by using foot screws.
Readings on the staff are taken automatically.
Readings on the staff are taken automatically.
An auto level is an optical surveying instrument where the line of sight is automatically kept horizontal using an internal compensator mechanism. Despite this automation, the observer must still manually sight the leveling staff and read the value through the telescope's eyepiece.
IS 10582:1983
An auto level is an optical surveying instrument where the line of sight is automatically kept horizontal using an internal compensator mechanism. Despite this automation, the observer must still manually sight the leveling staff and read the value through the telescope's eyepiece.
HAтАЛ=HBMтАЛ+BSтИТFS
Reduced┬аLevel=Height┬аof┬аInstrumentтИТStaff┬аReading
The compensator, typically a pendulum system suspended by fine wires or magnetic damping, utilizes gravity to maintain the line of collimation in a truly horizontal state. When the instrument is leveled roughly using circular bubbles and foot screws, the compensator corrects minor tilt errors automatically, ensuring precision without constant manual adjustments.
Auto levels contain a compensator system to maintain horizontal line of sight.
Rough leveling is performed using a circular bubble and three foot screws.
Data capture (reading the staff) remains a manual process performed by the surveyor.
Accuracy is enhanced as the compensator adjusts for small tilting of the vertical axis.
Significantly faster setup time compared to dumpy levels.
Higher precision due to automated compensation of leveling errors.
More complex internal mechanism compared to simple spirit levels.
Compensator may get stuck or malfunction under extreme vibrations or mechanical shock.
Topographic surveying
Construction layout and site leveling
Profiling and cross-sectioning
Option D is incorrect because auto levels do not have sensors for automated digital staff reading; that is a feature of 'Digital Levels' (Electronic Levels).
Option C is accurate as coarse leveling is required to bring the compensator within its operating range (typically ┬▒10тА▓ to ┬▒15тА▓).
D is correct тАФ Readings on the staff are taken manually by the observer, not automatically by the instrument.
Distinguish between 'Auto Levels' which use optical compensators and 'Digital Levels' which use barcode staff scanning; only the latter provides automatic readings.
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