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Pelco Manual C1937M-C (4/03)
CAMERA SYNCHRONIZATION (AC OPERATION ONLY)
When using more than one camera power supply, a brief vertical roll may occur on the monitor when a
camera view is switched. To eliminate vertical roll, adjust the phase control by synchronizing, or line-lock-
ing, the cameras to one another. Use the phase potentiometer located on the side of the camera (refer to
Figure 1) 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 adjust-
ments 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).
DYNAMIC RANGE AND THE EDR (EXTENDED DYNAMIC
RANGE) FEATURE
Dynamic range is the ratio between the brightest and darkest parts of an image or scene. A scene that
ranges from bright sunlight to deep shadows is said to have a high dynamic range, while indoor scenes
with less contrast will have a low dynamic range.
The EDR feature will help capture the entire range of the scene. A 12 times improvement in dynamic
range can be achieved with this feature. In scenes with very high dynamic range, the EDR feature will
exhibit a higher noise level than when the feature is turned off. This is normal, and not a mal-function.
NOTE: Depending on the scene contrast, it may or may not be possible to capture the entire range
with any camera. Careful camera placement should be considered in extreme cases.