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Installation
X935-24-00 Rev 108 V894CSH/V894WSH High-Security Cameras
Camera Synchronization
If there is more than one unit in a system, the cameras have to be synchronized to ensure there is no roll of
video. If the camera will be used in a line lock video application, the camera interface board is already set in
line lock mode by default. Camera synchronization is DIP switch selectable, line locked or internal. The use of
line-locking synchronization using a V-phase potentiometer (pot) is typically included in video equipment
requiring external video synchronization. As an example, equipment like a video switcher unit uses the
camera’s line lock to reduce “video jump” on its monitor during camera switching. The adjustment for the line
lock V-phase (VR1) is on the back board of the camera. Refer to Figure 2. The V-phase pot allows video to
power line phase adjustment up to 180
°
. If more than 180
°
of adjustment is required, swap the lines attached
to the 24 VAC terminal block connector. Be sure that the selector switch is set to position “LL” shown in
Figure 3. Note that the performance of the camera’s line lock depends on the quality of the power source. If
the camera experiences roll or jitter due to the quality of the power source, then it is best to set the camera to
internal “crystal” mode. This is done by setting the selector switch to “INT.” as shown in Figure 3.
Figure 2
DIP Switch/Potentiometer Location
