Pelco Manual C1456M-D (10/98) 395.11.6 Auto Iris
There are three settings for auto iris: mode, level, and peak.
To change the settings for auto iris:
1. Program preset 95 (28 if in 32-preset mode; refer to Section 5.4, PRESET
FUNCTIONS) to access the main menu (refer to Section 5.11.1, MAIN MENU
ACCESS). 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 on your keyboard. Another menu will appear with
auto-iris mode, level, and peak selections.
6. Move the joystick up or down to position the cursor beside one of the choices.
Press the Iris Open button on your keyboard.
MODE - The cursor moves to one of two choices: Auto or Off. In the Auto mode, the
iris is automatically adjusted to produce a constant video output as determined by
the Level setting below. In the Off mode, auto iris is disabled, and control is always
manual. Move the joystick up or down to toggle between Auto and Off. Press the Iris
Open button to select the choice, or press the Iris Close button if you do not want to
change the setting.
LEVEL - The cursor moves to a numeric value, which the Spectra® (Version 3.0)
dome uses to try to maintain a certain light level. Changing the value of the Level
setting will change the video level to which the auto iris adjusts. This setting should
be adjusted if the video level in the auto iris mode is too bright or too dark. Move the
joystick up or down to a value. Press the Iris Open button to select the value, or
press the Iris Close button if you do not want to change the setting.
PEAK - The cursor moves to a numeric value. Increasing this value will cause the
auto iris circuit to react more to highlights or “peaks” in the picture. Decreasing this
value will cause it to use the average video level to adjust the iris. Move the joystick
up or down to a value. Press the Iris Open button to select the value, or press the
Iris Close button if you do not want to change the setting.
If auto iris is in the auto mode, it remains that way until you manually open or close
the iris. The dome will return to auto iris when it is panned or tilted more than 15
degrees.
If there is not enough light for a good picture when the iris is wide open, you can
increase the gain of the camera to improve the picture. To do this:
1. The AGC mode (Section 5.11.5.1, AGC MODE) must be in either the Auto or
Off mode. The following steps will not work if the AGC mode is On.
2. Hold down the Iris Open button until the iris is wide open.
3. Release the button.
4. Within one second, hold down the button again. This will start increasing the
camera gain. Hold down the button until a desirable picture is obtained or the
maximum gain is reached.