SPECTRA PRECISION FOCUS 2 SERIES TOTAL STATION USER GUIDE
7 –
Checking and Adjustment
136
The
Collimation
screen appears.
3. In Face1, precisely sight the target, and then press the
OK
softkey.
4. The system displays the message
Turn to F2
.
Rotate the telescope, and sight the same target
precisely in Face 2. Press the
OK
softkey.
When complete, the screen displays the message
set
and then returns to the
Adjustment
menu.
Checking the instrument constant
The instrument constant is a numerical value used to automatically correct for the displacement
between the mechanical and electrical centers when measuring distances. The instrument constant
is set by the manufacturer before the instrument is shipped. However, to ensure the highest
operational accuracy, it is recommended that the instrument constant is checked several times a
year.
To check the instrument constant, either compare a correctly measured base line with the distance
measured by the EDM, or follow the procedure below.
To check the instrument constant:
5. Set up the instrument at point P, in as flat an area as possible.
6. Set up a reflector prism at point Q, 100 m away from point P. Make sure that the prism constant
is taken into account.
7. Measure the distance between point P and point Q (PQ).
8. Install a reflector prism on the tripod at point P.
About 100 m
P
Q
P
R
Q
