Sokkia SET 550 Setup And Operation page 25

Backsight
Backsight
Because there is no internal statistical measure
Because there is no internal statistical measure
of how well the
of how well the
is imperative to check the
is imperative to check the
independently:
independently:
Known point: shoot the target at a position of
Known point: shoot the target at a position of
known X,Y,Z such as a GPS point. The result
known X,Y,Z such as a GPS point. The result
should be within the resolution of the GPS.
should be within the resolution of the GPS.
Known angle: shoot to a landmark at a known
Known angle: shoot to a landmark at a known
azimuth from the instrument location
azimuth from the instrument location
should be within the resolution of the instrument
should be within the resolution of the instrument
by Angle cont
by Angle cont
backsight angle has been set it
backsight angle has been set it
backsight
backsight
...
...
- the angle
- the angle