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20 C3425M-E (1/09)
DN/CH/C SERIES ADJUSTMENTS
Refer to Figure 13 to adjust the IS90-DN, IS90-CH, or IS90-C model.
Figure 13. Adjusting the IS90-DN/CH/C Series Camclosure
SWITCH SETTINGS
Locate the DIP switch. Then set the switches for your installation.
SW4-1: Auto Gain Control
The automatic gain control (AGC) adjusts the image automatically to compensate for changes in light
levels.
Set SW4-1 to ON to enable AGC. Set it to OFF to disable AGC. The default is ON.
SW4-2: Backlight Compensation
The backlight compensation (BLC) feature compensates for backlit scenes by enhancing objects in the
center of the scene.
Set SW4-2 to ON to enable BLC. Use this setting if a bright backlight is present and the subject in the
center of the picture appears dark or as a silhouette.
Set it to OFF to disable backlight compensation. This is the default.
SW4-3: Line Sync
When multiple cameras are connected to the same switching device, vertical roll may occur on the
monitor. AC line lock eliminates vertical roll by locking the frame rate to the power supply frequency. Each
camera output is synchronized to the power supply frequency (refer to Vertical Phase Adjustment on
page 21 for more information.)
Internal line sync disables line lock and synchronizes cameras internally.
Set SW4-3 to OFF to use AC line lock.
Set it to ON to use internal line sync. The default is OFF.