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      Pelco Manual C1981M-C (8/02)

CAMERA SYNCHRONIZATION

When using one AC power supply in a multi camera system, a brief vertical roll may occur on the
monitor each time a camera view is switched. To eliminate vertical roll adjust the phase control to
synchronize (line-lock), the cameras to one another. The synchronization switch (DIP switch 5)
for each camera must be set to LL. Use the potentiometer located on the side of the camera to
make adjustments

It may be necessary to have two people in communication when synchronizing the cameras: one
person at the camera and another person at the monitor to observe the vertical roll and the effect of
any adjustments made at the camera.

To synchronize the cameras do the following:

1. Choose a reference camera to which all other cameras will be phased.

2. Select a camera and synchronize it to the reference camera by turning the phase adjustment

control clockwise and/or counterclockwise.

3. Each time an adjustment is made, switch back and forth between the camera you are adjusting

and the reference camera. Repeat this process as many times as necessary, until the roll
between the cameras is no longer noticeable.

4. Adjust the phase of all other cameras by repeating steps 2 through 3. Always adjust to the

reference camera selected in step 1.

NOTE: The preferred method for camera phase adjustment is to use a dual trace oscilloscope to
align the vertical sync pulses of the reference camera to the selected camera(s).