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6 Pelco Manual C718M (10/96)
5.4 WHITE BALANCE (ATW/AWB SWITCH)
In the ATW (Automatic Tracing White Balance) posi-
tion, the white balance is continuously adjusted to take
into account variations in the incident light conditions.
In the AWB (Automatic White Balance) position, when
the LOCK button is pressed, the white balance is auto-
matically adjusted, and the setting is stored in memory.
When the switch is set to this position the white bal-
ance always takes the previously stored value.
White balance is factory set to the AWB position and it
is recommended that the optics package be used in this
mode. Refer to Figure 4.
5.5 V-PHASE (VERTICAL PHASE)
V-phase (vertical phase) is valuable when multiple op-
tic packages are switched by a sequential or matrix
switcher. The vertical phase +/- buttons are used to com-
pensate for vertical phase discrepancies that will occur
in a multiple camera environment. In this type of envi-
ronment, each camera's output is synchronized by the
frequency of the power supply and phase.
Two persons are required to synchronize the picture:
one person at the optics package location and another
at the control room looking at a monitor viewing switch-
ing video signals from the optics packages.
The V-phase adjustment is ±90°. Use the tip of a
ballpoint pen or similar instrument to press the recessed
+/- buttons (refer to Figure 4). The phase change is lin-
ear. Pressing a button will activate a phase change in
the direction indicated. The phase change will begin
after about 1/2 second, but the switch must be held down
for a total of 5 or 6 seconds for the phase change to
occur. An equal amount of time is required to go in the
opposite direction.
Each optics package should be adjusted so that as the
switchers switch from one optics package to the next,
the monitor does not “roll” or show partial frames of
the video picture.