SPECTRA PRECISION FOCUS 2 SERIES TOTAL STATION USER GUIDE
7 –
Checking and Adjustment
135
Zero point errors of vertical scale and
horizontal angle corrections
Checking
1. Set up the instrument on the tripod.
2. Follow the leveling procedures described in Leveling, page 29.
3. Flip the telescope to the Face-1 position.
4. Sight a target that is within 45° of the horizontal plane.
5. Read the vertical angle from the VA1 field in the Basic Measurement screen.
6. Rotate the instrument 180° and flip the telescope to the Face-2 position.
7. Read the vertical angle from the VA2 field.
8. Add the two vertical angles together, VA1 + VA2.
–
No adjustment is required if the zero reference for vertical angles (VA zero setting) is set to
Zenith, and VA1 + VA2 equals 360°.
–
No adjustment is required if the zero reference for vertical angles (VA zero setting) is set to
Horizon, and VA1 + VA2 is either 180° or 540°.
–
An adjustment is required if VA1 + VA2 is not one of the values listed above.
Note –
The difference between the vertical angle reading the relevant angle (either 360° for
Zenith, or 180° or 540° for Horizon) is called the
altitude constant
.
Adjusting
1. From the main menu, press
[7]
(or press
[v]
and
[REC/ENT]
)
to select
Adjust
.
The
Adjustments
menu appears.
2. Press
[2]
(or press
[v]
and
[REC/ENT]
) to select
Collimation
.
