The Perpendicularity Of Collimation Axis And Cross Axis (2C) - Titan TTS2 Manual

11.4 The Perpendicularity of Collimation axis and
Cross axis (2C)
Check
1. Set a target A in about 100m away, and make sure the vertical
angle of the target is within ±3°.Precisely level the instrument and
switch on it;
2. Make the telescope focused on target A in face left, and read
the horizontal angle e.g. HA (L)=10°13'10";
3. Loosen the vertical and horizontal brake hand-wheel, turn the
telescope, rotate the alidade to face right and focus on the same target
A. Before aiming please tighten the horizontal and vertical brake
hand-wheel and read the horizontal angle;
e.g. HA (R)=190°13'40"
4. If 2C=L-(R±180°)=-30"≥±20", the instrument need to be
calibrated.
Calibration
1.Use the horizontal slow motion knob to adjust the horizontal
angle to the right reading which has eliminated the C.
R + C = 190°13 '40 "-15 "= 190°13' 25";
2.Take down the reticle bed cover between the telescope
eyepiece and focusing hand-wheel, adjust the calibration screw of the
crosshair on the left and right. First, loosen the screw on one side, and
screw up the screw on the other side, move the reticle and focus on
target A;
3. Repeat the test steps, calibrate it to | 2 C | < 10;
4. Tighten the calibration screws, put the protective cover back.
Note: Check the photoelectric coaxiality after calibrating.
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