74
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 it
on.
2.
Make the telescope focused on target A on the left face, 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 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, 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.
Summary of Contents for Total Station ATS-120 Series
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