Sokkia im-101 Operator's Manual page 205

2. Set the horizontal angle to 0°.
Press [0SET] twice in the first page of the OBS mode screen
to set the horizontal angle to 0°.
3. Select "Instr. const" in the Config. mode screen to display
the current correction constant in the X (sighting) direction
and Y (horizontal axis) direction.
Select "Tilt X Y" and press {ENT} to display the tilt angle in
the X (sighting) direction and Y (horizontal axis) direction.
4. Wait a few seconds for the display to stabilize, then read the
automatically compensated angles X1 and Y1.
5. Loosen the horizontal clamp and turn the instrument 180°
while referring to the displayed horizontal angle, then
retighten the clamp.
6. Wait a few seconds for the display to stabilize, then read the
automatically compensated angles X2 and Y2.
7. In this state, calculate the following offset values (tilt zero
point error).
Xoffset = (X1+X2)/2
Yoffset = (Y1+Y2)/2
If one of the offset values (Xoffset, Yoffset) exceeds ±20",
adjust the value using the following procedure.
When the offset value falls within the range ±20", adjustment
is not necessary.
Press {ESC} to return to <Instr. const>.
PROCEDURE Adjusting
8. Store values X2 and Y2.
Press [OK]. "Take F2" is displayed.
Config
Obs.condition
Instr.config
Key function
Comms setup
Instr.const
Instr.const
Tilt: X
Colllimation
HA-R
HA-R
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35. CHECKS AND ADJUSTMENTS
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