Instrument rotator

1.

The rotator position angle is conventionally zero. It is usually difficult to rotate an instrument because of the cable ties. Guiding proves to be extremely difficult at position angles other than zero.

2.

First zenith park the telescope. None of our instruments is exactly balanced in rotation and may swing out of control when the telescope isn't in the zenith.

3.

Go to the observing floor and undo the rotation clamp.

4.

Rotate to the desired angle using the push buttons. Watch the cables carefully throughout because even if they are long enough they may still get tangled.

5.

Reclamp. The control computer can read the rotator position angle so no further action is needed.