The TV control box is at present in Bay 1 of the telescope control console. There are two monitors associated with the TV. The first is the 'raw video' monitor which is on top of the control console and secondly there is the all-singing, all-dancing Grinnell monitor which is incorporated into the control console to the left of the main GD4K display. Below the Grinnell monitor is an array of feature-selection buttons. These are described in detail in Section 6.4. The final piece of hardware in the TV system is a joystick controller box which normally resides on the telescope control console desk - or nearby.
Nowadays the TV Camera is mostly used with the CCD Camera. Typing TV at the instrumentation computer will bring the TV flat in, in about seven seconds. Similarly it can be removed by typing CCD. The TV flat's position can be seen on the MIMIC display.
Another use for the TV Camera is with the People's Photometer where it is mounted so as to view the rear of the Photometer apertures. Different aperture plates can be mounted and selected under pneumatic control from the instrumentation computer in about a second. It is usual to leave one aperture plate position empty so that the TV can view a field of about 3x4 arcmins for acquisition.
The TV can also be used with the old A & G Box, now mostly confined to the Richardson-Brealey spectrograph. The old A & G box control box is available at the desk. Only two of the illuminated double-action switches are relevant to the operation of the TV. The first from the left on the top row ACQN/COMP MIRROR (IN/OUT) is used to move the flat mirror into or out of the beam. The movement takes approximately 15 secs each way. Successful parking of the mirror is indicated by the ACQN/COMP switch which illuminates either IN or OUT. While the mirror is in motion, the adjacent PROBE MOVING switch will illuminate.
To operate the system follow these steps: