Ros CE-X-36, Руководство по эксплуатации и обслуживанию

Страница: 17 / 29

3 CAMERA OPERATION
3.1 GENERAL
Operation of the CE-X, 36:1 Camera is straightforward, but there are some differences,
which may not be familiar to personnel accustomed to operating older closed circuit TV
system.
3.2 INSTALLATION
For ease of mounting, the CE-X, 36:1 camera has a mounting saddle, integral to its
housing, with two 1/4-20 UNC tapped holes on 2.00 inch mounting centers. The camera
must be mounted in a position that will protect against impacts with obstacles passing close
to the camera. The camera housing should be electrically isolated from the mount with a
thin piece of rubber, electrical tape, or other non-conductive material in order to reduce
effects of galvanic corrosion from metal to metal contact in water.
The pins on the camera connector should be cleaned and dried then sprayed with a
silicone-based lubricant. Grease should not be used on enclosed connectors such as the
standard LPMBH series. Grease will eventually become impacted in the mating connector,
forcing the contacts apart and causing intermittent operation.
3.3 EXPOSURE CONTROL
The CE-X, 36:1 Camera provides operation over a wide range of scene illumination. To
achieve this wide range the camera achieves Exposure Control through composite
operation of the iris, video gain, and shutter modes. For most operations automatic
exposure mode is used to optimize the camera for the existing illumination.
The camera’s iris, gain, and shuttering functions are all controlled by an internal
microprocessor. This automatic mode is normally selected when the camera is turned on.
As illumination is increased from complete darkness, the AGC (automatic gain control) is
the first function to operate from maximum to minimum gain. At the point of minimum gain
the iris begins to function, closing as the illumination continues to increase. If the
illumination continues to increase with the lens fully closed, the camera goes into a
shuttering mode where the CCD is allowed to capture light over decreasing time intervals
as the illumination increases.
In the event that manual Exposure Control is desired due to unusual viewing conditions
such as severe reflections or flashing lights, the switch on the remote control unit can be
toggled towards either the INCR or DECR position. This will place the camera in the
manual mode and each toggle will result in a step change of the exposure. The operator
normally continues to toggle this switch until an optimum display is seen on the television
monitor.
51-17568 REV B 11