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Pelco Manual C1982M-A (12/00) [ 13 ]
4 EI ON/EI OFF (Electronic Iris)
The EI (Electronic Iris) feature compensates for an excessive light level by automatically adjusting
shutter speed. When the EI is ON, the DD lens level potentiometer on the side of the camera may
be used to adjust the EI threshold level. The level is factory set to 1V peak-to-peak.
OFF - Disables the Electronic Iris mode. Use with auto iris/direct
drive lenses.
ON (Default setting) - Enables the Electronic Iris mode. Use with
fixed or manual iris lenses.
3 and 2 BLC - Backlight Compensation
Use the BLC (Backlight Compensation) when a bright light source is behind the subject of interest.
If a strong background light such as a window exists, the camera will compensate by reducing the
overall exposure, making the areas surrounding the window too dark. Use the BLC feature to con-
trol the exposure of the scene.
Typically, the image in the center of the picture is used to calculate the exposure. The edges
where strong backlighting is likely to be are ignored.
BLC will function with a manual iris lens when the Electronic Iris feature is switched ON. For di-
rect drive and auto iris lenses, BLC will still function even though the Electronic Iris feature is
switched OFF.
Three active zones are available when setting the Backlight Compensation mode. The lighting
from within the selected BLC active zone (the dark areas in Figure 8) is used to calculate the
scene exposure. To select a zone:
1. Set the WND ON/OFF switch to ON. This will superimpose the selected zone onto the monitor.
2. Use switches 3 and 2 to select one of the BLC active zones (refer to Figure 8).
3. Set the overlay window switch to OFF.
= BLC Active Zone -The area used to calculate picture exposure.
Figure 8. BLC Setup Switches
1 WND ON/WND OFF - BLC Setup Window
This switch allows you to turn the BLC window video overlay on or off.
The overlay is used in conjunction with switches 8 and 9 as an aid to
setting the Backlight Compensation feature.
4
4
EI
OFF
OFF
3
2
3
2
3
2
3
2
1
1
OFF
WND