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3 CAMERA OPERATION
3.1
GENERAL
Operation of the SCE-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 SCEX, 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 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 because it
will eventually become impacted in the mating connector, forcing the contacts apart and
causing intermittent operation.
3.3
EXPOSURE CONTROL
The SCE-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.
To restore automatic Exposure Control simultaneously operate the Zoom towards WIDE
and the Exposure switch towards DECR.
