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Check and Adjusting
There are three areas of performance the user should check periodically.
Horizontal Calibration
Horizontal Rotation Cone
Grade Setting
The Horizontal Calibration can be easily checked and, in most cases, adjustments made by the
user. Both Horizontal Rotation Cone and Grade Setting can be checked by the user, but should an
error be found, adjustments must be made by a Topcon service facility.
Horizontal Calibration
(1) Checking Calibration
1 Set up a tripod 50m(164ft) from a staff or wall. Mount
the instrument on the tripod, facing the “X-” axis toward
the staff/wall.
2 Remove the RC-300W from the instrument.
3 While pressing the Function [F] key of the RC-300W
press the power switch to turn on the instrument. This
activates the calibration mode.
Always be sure the RC-300W is within two-way
communication while checking and adjusting the
instrument. If the RC-300W displays error code [COM
ERR TURN OFF / TURN ON] any time during the
procedure, turn the instrument OFF and ON again and
repeat the procedure from the beginning.
50m (164feet)
Level sensor
Staff or Wall
Turn On the instrument while pressing [F].
X: Y:
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