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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.
