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Lab: Level Testing
Objective:
The objective of this lab is to determine the CFactor, the collimation
error, and to explore the randomness of a level
Overview:
Determining the CFactor will help eliminate the systematic errors
associated with the level when the distance between the foresight and backsight is
unbalanced.
This factor will be applied to each measurement in order to obtain the truest
value possible.
Equipment:
The following is the equipment needed to perform this lab:
an automatic
level, tripod, level rod, turn points.
1.
Perform a Peg Test on the level:
Follow the procedure outlined in lecture.
Select two points (pegs) about 300 ft apart.
Set
up half way between, read both rods, calculate the True Difference in Elevation (TDE).
Set up near A, read near rod A and far rod B.
Apply TDE to near rod A reading
(errorless) to compute "perfect" far rod reading.
Subtract perfect far rod from actual far
rod.
Express C as slope of the line of sight
ft/ft ratio.
The sign = + if below the perfect,
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 Spring '11
 Gibson

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