Iris Control, Shutter Speed Control, AGC Control

Function Descriptions

[4] IRIS Control

⁃⁃ Auto Iris

The lens aperture is automatically controlled to correct the brightness of the average luminance value of the image.

⁃⁃ Manual Iris

This fixes the lens aperture. The aperture position can be set to a range of 17 levels (1: close - 7: open) using the Manual IRIS Stop command.

・EI ON

The light intensity can be controlled to a fixed level using an electronic shutter control.

Note: Executing the EI ON command sets the shutter speed mode to OFF.

・EI OFF

This fixes the electronic shutter. Refer to the Shutter Speed Control on the next page regarding fixed values.

⁃⁃ Iris Level

The target brightness can be configured to a range of 0 to 100.

[5] Shutter Speed Control

⁃⁃ Prolonged Exposure Mode

The exposure time is a longer mode than 1 field. The field accumulation time can be configured from 1x to 32x.

However, this cannot be configured during the following conditions.

・When SENSE UP is enabled.

・When MOTION settings are enabled. ・When EI is ON.

⁃⁃ Normal Mode

This is fixed to 1/60 (1/50).

⁃⁃ High-Speed Shutter Mode

This can be configured from 1/60 to 1/10000.

Note 1) If flickering is noticeable in regions with a power supply frequency of 50Hz when using NTSC, switch to the High-Speed Shutter Mode (1/100).

Note 2) When switching to the Prolonged Exposure or High-Speed Shutter Mode, transmit the “Shutter Speed Set Mode” command after the “Shutter Long Direct” or “Shutter Short Direct” command.

⁃⁃ SENSUP

If the illumination of the subject decreases, the Prolonged Exposure Control is automatically executed along with the AGC Control.

The maximum Field Accumulation Time can be configured to a range of 1x to 32x.

This cannot be configured during the following conditions.

・When the MOTION settings are valid. ・When AGC is OFF.

In addition, the shutter speed mode is set to OFF.

[6] AGC Control

⁃⁃ AGC ON

The gain is automatically controlled and light is fixed to a certain intensity.

The MAX gain of each mode of LOW/NORMAL/ MIDDLE/HIGH is roughly equivalent to the following gains.

AGC Gain (dB)

	LOW	NORMAL	MIDDLE	HIGH
AUTO	—	9dB	12dB	15dB
COLOR	1.5dB	6dB	10.5dB	15dB
B/W	6dB	9dB	12dB	15dB

⁃⁃ AGC OFF

This is the fixed gain mode. The gain value can be manually configured to 11 steps.*

The gain value of each step is roughly equivalent to the following gains.

	Gain Direct	Gain
	Configuration Value	Gain
	Configuration Value
	0	0dB
	1	3dB
	2	6dB
	3	9dB
	4	12dB
	5	15dB
	6	18dB
	7	21dB
	8	24dB
	9	27dB
	10	30dB

Note: When the Day/Night mode is set to AUTO, the AGC OFF cannot be set.

− 29 −