Inspection and Adjustment
T.O.2
| 33
5.6 Index Error of Vertical Circle
Inspection
1. Fix the instrument on the tripod and perform precise leveling up.
2. Aim the telescope at any object point P in the normal position and take the reading of
vertical angle Vnorm.
3. Turn the telescope to the reverse position and aim it at point P again. Take the reading
of other vertical angle VRev.
4. If (Vnorm + VRev) - 360° = 2I, I
≤
15", no adjustment is required; otherwise, perform
adjustment.
Adjustment
1. Press and hold
R/L
+
HOLD
buttons and press
ON/OFF
button. Release
ON/OFF
button when full
character display appears and release
R/L
+
HOLD
buttons when four beeps are heard.
2. Sway the telescope near horizontal plane with instru-
ment in the normal position and allow vertical angle to
be reset after zero cross. Aim the telescope in the
normal position at object P and press
0SET
to
confirm.
