Product Manual

9.6 Horizontal collimation error C

Check

(1)Set-up the instrument and level it accurately.

(2)Aim at the cross-hairs of collimator or the

obvious target at a distance. Get the face left angle

reading H(l) and the face right angle reading H(r).

(3)Calculating the horizontal collimation error C

according to C = ( H(l) – H(r)±180°) / 2

If C＜10″, no adjustment will be necessary.

If C＞10″, proceed with the following adjustment.

Adjustment

(1)Rotate the instrument in face right position,

turning horizontal tangent screw until

H(r′)=H(r)+C.

(2)Loosen the shield of telescope’s reticle, adjusting

two screws at left and at right until the vertical hairs

of telescope’s reticle coincides with the cross-hairs

of collimate or target.

(3) Repeat the check and adjustment procedure until

it is up to standard value.

For example:

Face left angle

H(l)=000°00′00″

Face right angle

H(r)=180°00′30″

Horizontal collimation error C is:

C=(H(l) – H(r)±180°)/2 = -15″

If C is out of tolerance, need to adjust

Fig. 24

Focusing ring

Adjustment

screw

Eyepiece