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FACULTY: ENGINEEERING TECHNOLOGY
EDITION:
01
LABORATORY: CIVIL ENGINEERING
REVISION NO:
01
EFFECTIVE DATE:
SEPT.
TECHNOLOGY EXPERIMENT: TWO PEG TEST
2016 AMANDMENT
AUG.201
DATE:
6
e 2 (.6- .67) 2 .m 2 mm 'rror, e 2 (& -&3) > (& > &3) e 2 .7- .39 2 .m 2 mm
.0 DISCUSSION
T#o peg test is the most important part of a leveling survey, as #ell as it needs to be carried out before #e start the leveling "ob to ensure the instrument is in a good condition. hec!ing of instruments is important and needed, because they may sub"ect to errors. The main error is #here the line of sight is not parallel to the horiContal line of collimation. A test for chec!ing the level is !no#n as the t#o peg test. This test determines the amount of error. The entire process should be repeated as a chec!. %t is practically impossible to ad"ust the instrument so that no collimation error exists. The purpose of the ad"ustment is to reduce the siCe of the error.
or this experiment in our levelling test, . (& > &3) 1 0 mm1m the value of e for first set up is mm and second set up is mm. &ince the range for collimation error is .
