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14 Pelco Manual C1498M-A (7/99)
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, 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.
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 Lite™ 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.
PEAK – The cursor moves to a numeric value. Increasing this value will make the auto iris
circuit react more to highlights or “peaks” in the picture. Decreasing this value will make it
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 (
Gain/AGC
section) 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 you get a desirable picture or reach the maximum gain.
SHUTTER SPEED
There are nine electronic shutter speeds:
Auto 1/100 1/120
1/500 1/1,000 1/2,000
1/4,000 1/10,000 1/30,000
In the Auto setting the camera controls the shutter speed automatically. Increasing the
shutter speed lowers the light sensitivity, but rapidly moving objects will be less blurred as
the speed is increased. To change the electronic shutter speed settings:
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 Next.
4. Press the Iris Open button to go to the next camera submenu.
5. Move the joystick up or down to position the cursor beside Shutter Speed.
6. Press the Iris Open button. The cursor moves to the right beside the current shutter speed.
7. Move the joystick up or down to choose the shutter speed.
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.