Hi-Target ZTS-320 Series - The Perpendicularity of Collimation Axis and Cross Axis (2 C)

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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 handwheel, 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 handwheel 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 reticule bed cover between the telescope
eyepiece and focusing handwheel, 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.
Cross wire correction screw
Eyepiece