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. 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 Location
6
•
Installation
X935-20-00 Rev 1204 V894CSHR-VF/V894WSHR-VF High-Security Cameras
