== '''Observing''' ==
'''Target exposuresAcquiring a target''' The shabby A4 notebook stored on the bookshelf contains previous "red marker" positions on which to locate a target with the guide mirror in beam. '''Current latest red marker coordinates:''' (218,50) on 23/01/2015. Note that this position shifts slightly after each instrument change, and when pointing far from zenith. To acquire a target: 1) On the TCS, with guide mirror in beam, place a red marker on the acquisition image in the previously recorded position (e.g. 218,50). 2) Point the telescope to the target and centre it on the red marker. 3) On QUARTZ "Control" panel, click "APD" to turn on the avalanche photodiode. 4) On TCS, move guide mirror out of beam, and "Go To" XY-slide position (590, -12900) to view the fibre. Set acquisition camera exposure time ~2s. 5) On "Piet's Old Laptop", run the APD plotter by clicking on the white arrow and wait for the counts to stabilise. 6) With the hand paddle switched to "Guide" speed, adjust the telescope pointing to centre the star on the fibre. You should see an illuminated disc on the acquisition image, which is the reflection of the star from the small mirror inside the GIRAFFE head (although after an instrument change you may not see this yet). The technique to centring the star is to make small movements of the telescope and use the rising/falling APD counts and brightening/dimming acquisition image to help you centre the star on the fibre. As the star becomes better centred, the APD counts will increase, and a bright disc will appear on the acquisition camera image. '''Exposing on a target'''
1) Select “ND Pos 1” and “Mir Pos 1” in the QUARTZ “Control” panel