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ELC (Electronic Light Control)/BLC (Back Light
Compensation) Description
1. ELC (Electronic Light Control)
In this mode a continuously variable electronic
shutter is employed to automatically control expo-
sure times in the CCD Image Sensor, according to
the incoming light level. When this mode is select-
ed, fixed or manual iris lens can be used instead
of an ALC type lens.
Caution :
1. Under bright conditions such as outdoors, use
an ALC type lens as the ELC control range is
not wide enough under these conditions.
2. Under certain unique lighting conditions, the
following may appear :
• strong smear and/or blooming on high light
objects such as spot lights or windows.
• noticeable flicker in the picture and/or the
colour rendition variations.
• periodic variance of white balance
Should these phenomena occur, use an ALC lens.
CONNECTION
1. A power supply of 12V DC is required.
2. Connect the power cable to the 12V DC Power
Terminal on the rear panel of the camera.
Resistance of copper wire [at 20°C (68°F)]
Copper wire
#24
#22
size (AWG)
(0.22mm
)
(0.33mm
2
Resistance
0.257
0.165
ohms/ft
Resistance
0.078
0.050
ohms/m
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2. BLC (Back Light Compensation)
When strong, unwanted background lighting inter-
feres with the clarity of important scene objects,
turn the Back Light Compensation On/Off Switch
(8) to the "ON" position.
Caution :
-7-
• Calculation method of maximum cable length
between camera and power supply.
10.5V DC ≤ V
L : Cable length (meter)
R : Resistance of copper wire (ohms/meter)
V
L standard =
L minimum =
2 VDC
0.5 V - 16 V)
L maximum =
#20
#18
)
(0.52mm
)
(0.83mm
)
2
2
2
0.099
0.059
0.030
0.018
-8-
ON
Setting this switch to the "BLC OFF" position
is recommended in the use with the pan/tilt
head or in the object having the rapid change
illumination since the speed of lens iris
becomes slow in the "BLC ON" position.
− (R x 0.42 x L) ≤ 16V DC
A
: DC output voltage of power supply unit
A
V
− 12
A
(meter)
0.42 x R
V
− 16
A
(meter)
0.42 x R
V
− 10.5
A
(meter)
0.42 x R
OFF
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