Laser Setup
Topcon AG System Five Operator’s Manual
3-18
Laser Accuracy and Repeatability
The accuracy and repeatability of a laser transmitter are measured
in arc seconds. Arc seconds is an angle of measurement used when
specifying the accuracy of a laser or other leveling instrument.
A circle is divided into 360°. A degree is divided into 60 arc
minutes. An arc minute is divided into 60 arc seconds. Table 3-2
shows how arc seconds relate to elevation at a distance.
Table 3-2. Arc Seconds vs. Feet/Meters
At 100’ /30m At 500’ / 152m At 1000’ / 305m
1 arc second = .0005’ / .00015m .0024’ / .00073m .0048’ / .00146m
5 arc seconds = .0024’ / .00073m .012’ / .00366m .024’ / .00732m
10 arc seconds = .0048’ / .00146m .024’ / .00732m .048’ / .01463m
15 arc seconds = .0072’ / .00219m .036’ / .01097m .072’ / .02195m
To Next Page
Loading...
