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Pelco Manual C1498M-B (7/99) 13
GAIN/AGC
AGC Mode
The two AGC (Automatic Gain Control) modes are auto and off.
• In auto mode, the dome automatically adjusts the gain–the amount of amplification the
camera places on its video information to obtain a full 1-volt peak-to-peak video signal
out. If the iris is manually opened to its wide-open position and the picture is weak, the
AGC can be turned off and the gain increased manually to improve the picture. When
you close the iris, the AGC turns back on automatically when the lens iris starts closing.
• In off mode, the AGC is off.
To change the AGC mode:
1. On the main menu, move the joystick up or down to position the cursor (>) beside Camera.
2. Press the Iris Open button to enter the Camera submenu.
3. Move the joystick up or down to position the cursor beside Gain/AGC.
4. Press the Iris Open button to enter the Gain/AGC submenu.
5. Move the joystick up or down to position the cursor beside AGC mode.
6. Press the Iris Open button. The cursor moves to the right beside the word Auto or Off.
7. Move the joystick up or down to choose between Auto or Off.
8. SELECT – Press the Iris Open button to select your choice.
CANCEL – Press the Iris Close button if you do not want to change the setting.
Gain
Gain adjusts the signal level of the video output. Increasing the gain in low light conditions
increases the noise level in the picture. To change the gain:
1. On the main menu, move the joystick up or down to position the cursor (>) beside Camera.
2. Press the Iris Open button to enter the Camera submenu.
3. Move the joystick up or down to position the cursor beside Gain/AGC.
4. Press the Iris Open button to enter the Gain/AGC submenu.
5. Move the joystick up or down to position the cursor beside Gain.
6. Press the Iris Open button. The cursor moves to the right beside the current gain
setting (a numeric value).
7. Move the joystick up or down to change the gain (making the picture on your monitor
get brighter or darker).
8. SELECT – Press the Iris Open button to select your choice.
CANCEL – Press the Iris Close button if you do not want to change the setting.
AUTO IRIS
There are two settings for auto iris: mode and level.
To change the settings for auto iris:
1. Program preset 95 (28 if in 32-preset mode; refer to the
Preset Functions
section) to
access the main menu (refer to the
Main Menu Access
section). The main menu will
appear.
2. If the cursor (>) is not beside Camera, move the joystick up or down to position the
cursor beside Camera.
3. Press the Iris Open button to enter the Camera submenu.
4. Move the joystick up or down to position the cursor beside Auto-Iris.
5. Press the Iris Open button. Another menu will appear with auto iris mode and level
selections.