18
Vertical index difference and vertical index zeroing
Note:After making adjustments make the inspection as following:
Leveling the instrument and turn the power on. Then, sight at a reference A with normal
position telescope and obtain the vertical angle (L).
Reverse the telescope and sight at the object A again and obtain the vertical angle (R).
•
If vertical angle is zero at zenith, then, vertical index difference I = (L+R-360°) / 2
•
If vertical angle is zero at horizontal, then, I = (L+R-360°) / 2 or (L+R-540°) / 2.
•
If |
I
| ≥ l0”, vertical index zeroing should be set again.
After leveling the instrument, press
+ key and ,release when display charac-
ters and release
+ until three beeps,The instrument displays:
In normal position, Sight at a clear and stable object A , which is nearly the same height
as the instrument, turn the telescope around near the horizontal direction until vertical
angle of A appears. Press key, displaying FACE-2.
Reverse the telescope and sight at the object A again. Press key to finish vertical
index zeroing setting. The instrument returns to angle measurement mode.
Repeat the inspection procedure until index difference (I) meet the requirement, If the
vertical index difference does not meet the standard yet after being adjusted repeatedly,
the instrument should be sent to factory to be repaired.