Справочник Пользователя для Pelco C3427M-D (2/09)

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C3427M-D (2/09)

The electronics of the IS150-DW and IS150-CW Series Camclosures automatically adjust the camera to 
the auto iris. Auto iris level adjustments are not necessary.

VERTICAL PHASE ADJUSTMENT
Use this procedure for 24 VAC operation only.

When using more than one camera power supply, a brief vertical roll may occur on the monitor when 
switching from one camera to another.

To eliminate vertical roll, reverse the 24 VAC connections on one camera. If both cameras are connected to 
the same transformer, this should solve the problem. If the problem persists, adjust the phase control by 
synchronizing, or line-locking, the cameras to one another. 

When adjusting vertical phase, line sync (SW1-2) must be set to ON for AC line lock.

You may need two people when synchronizing the cameras: one at the camera, the other at the monitor to 
observe the vertical roll and the effect of any camera adjustments.

To synchronize the cameras:

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

2. Select the camera to synchronize. Use the phase adjustment control (R7) to synchronize the camera 

to the reference camera (refer to Figure 12 on page 21). Turn R7 clockwise to increase vertical 
phase; turn R7 counterclockwise to decrease vertical phase.

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).

If small white or color spots appear in the video image, one or more pixels on the camera imager may be 
defective. (This condition is common for both CCD and CMOS imagers.)

DW and CW Series cameras have auto iris lenses and automatically detect and correct defective pixels 
during startup. Manual pixel correction is not available.