Hitachi HV-D37A, HV-D27A operation manual Slow, Fast

5.ALC

1)PEAK/AVE : Set auto level control for Peak or Average in 4 steps of 50/50, 25/75, 18/85 or 0/100. At high Average setting, background may be difficult to see in picture bright components. Increasing the Peak setting may render spotlighted components easier to see.

2)OVER RIDE : Auto level setting

ALC level setting in range of -128 to 127 (about ±2 F stops). Press R and L for respectively higher or lower video level settings. Press both L and R for about 2 seconds to set to 0.

3)SPEED : AGC and AES response speed

• SLOW	: Slow response to scene light variations. Allows a stable image when a strong light
	source, e.g., vehicle headlights, enters the scene.

•STANDARD : Normal setting

• FAST	: Quick response to scene light variations. Use where variations are sudden, such as
	when changing a microscope magnification.

4)ALC GATE : ON/OFF toggle

•ON : Video signal is detected in the ALC Gate area for controlling AGC, lens and auto electronic shutter and ALC.

Note: The detect area cannot be seen on the screen, the ALC control functions for the iris gate.

•OFF : The overall video signal is detected for ALC control

5)ALC GATE SEL : Select ALC gate pattern

Select pattern from among Modes 1, 2, 3, 4, 5 and 6. Use according to scene conditions.

20