Sokkia SET 550 Setup And Operation page 27

Backsight
Backsight
Always check the calibration of the instrument
Always check the calibration of the instrument
by shooting the target used for the
by shooting the target used for the
The resulting X,Y,Z should be within the
The resulting X,Y,Z should be within the
several cm resolution typical for a TS
several cm resolution typical for a TS
instrument.
instrument.
It is a very good idea to shoot other
It is a very good idea to shoot other
benchmarks within range to make sure
benchmarks within range to make sure
accuracy is within acceptable limits
accuracy is within acceptable limits
by coordinate
by coordinate
...
...
backsight .
backsight .