TWO PEGS TEST
Instrument
TWO PEGS TEST
Instrument
Objective
- check for collimation error
- calculation of c factor
- optimization of BS $ FS
- decision of accept / decline of leveling
work
TWO PEGS TEST
 |
1.Establish
2 points 60 to 90 metres apart on reasonably level ground . |
 |
2.Set the level up half way between the 2 points . |
 |
3.Take the 2 staffs reading .The difference between the 2 reading will give the true difference in height between 2 pegs . |
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4.Move the level as close as possible to one of pegs . |
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5.Take the
2 staffs reading again . |
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6.Calculate
the collimation correction or c-factor or Cf |
|
PEG A |
364.63 |
1.412 |
|
PEG B |
381.37 |
1.241 |
|
DIFFERENCE |
16.74 |
17.10 |
| The difference of distance between A and B |
42 |
| Distance AC |
40 |
| Distance CB |
2 |
| Distance near point C |
2 |
| The difference of distance between AC and BC |
38 |
| The error every distance |
0.0036 |
| The collimation correction or c-factor or Cf |
0.0000947 |
The error = 1: 10556
