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12.5 VERTICAL INDEX DIFFERENCE COMPENSATION
Check
1. Mount and level the instrument and make the telescope parallel with the line connecting the center of the
instrument to any one of the screws. Lock the horizontal clamp screw.
2. After turning on the power, zero the vertical index. Lock the vertical clamp screw and the instrument
should display the vertical angle value.
3. Rotate the vertical clamp screw slowly in either direction about 10mm in circumference, and the error
message “b” will appear. The vertical axis inclination has exceeded 3ˊat this time and exceeds the
designated compensation range.
4. Rotate the above screw to its original position, and the instrument display screen will show the vertical
angle again, meaning that the vertical index difference compensation function is working.
Adjust
If the compensation function is not working, send the instrument back to the factory for repair.
12.6 ADJUSTMENT OF VERTICAL INDEX DIFFERENCE (I ANGLE) & SETTING
VERTICAL INDEX O
Inspect the item after finishing the inspection and adjustment of items in 12.3 and 12.5.
Check
1. Power on after leveling the instrument. Collimate object A in Face I and read the Vertical angle value L.
2. Rotate the telescope. Sight object B in Face Ⅱ and read the Vertical angle value R.
3. If the vertical angle is 0° in zenith，i=(L+R-360°)/2
If the vertical angle is０° in horizon. i= (L+R-180°)/2 or (L+R-540°)/2.
4. If ｜i｜ ≥10″ should set the Vertical Angle 0 Datum again.
Adjust
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