DIP Switch Settings, Camera Synchronization

DIP Switch Settings

There is a DIP switch on the front camera board that allows the selection of: Switch 1 - ALC (OFF) or ELC (ON); Switch 2 – Internal (Crystal) Synchronization (ON) or Line Lock (OFF); Switch 3 – AGC (ON or OFF); Switch 4 – BLC (ON or OFF). ALC setting is for external autoiris and ELC setting is for internal autoiris. The day/night camera includes a switch to select having the day/night feature turned ON or OFF. If day/night is turned ON, at a low light level the camera changes to monochrome mode and the resolution and sensitivity increase. Refer to Figures 5 and 6 for the location and setting of the switches. See Table 3 for camera and lens specifications.

There are two potentiometers on the camera. VR1 on the back board is for V-phase adjustment; VR1 on the top board is for autoiris adjustment. Refer to Figure 5.

Camera Synchronization

If there is more than one unit in a system, the cameras have to be synchronized to ensure there is no roll of video. If the camera will be used in a line lock video application, the camera interface board is already set in line lock mode by default. Camera synchronization is DIP switch selectable, line locked or internal. The use of line-locking synchronization using a V-phase potentiometer (pot) is typically included in video equipment requiring external video synchronization. As an example, equipment like a video switcher unit uses the camera’s line lock to reduce “video jump” on its monitor during camera switching. The V-phase pot allows video to power line phase adjustment up to 180°. If more than 180° of adjustment is required, swap the lines attached to the 24 VAC terminal block connector. Be sure that the selector DIP switch is set to position “LL”. Note that the performance of the camera’s line lock depends on the quality of the power source. If the camera experiences roll or jitter due to the quality of the power source, then it is best to set the camera to internal “crystal” mode. This is done by setting the selector switch to “INT.”

The adjustment for the line lock V-phase (VR1) is on the bottom board of the camera.

Autoiris Adjustments

On autoiris lenses, iris adjustment may be required if the picture appears dark or grainy or has poor color. To obtain the sharpest picture possible, the iris adjustment should be made from a “full bright” setting down to an acceptable video level. This assures that the internal AGC of the camera is not operational. There is a potentiometer to adjust the DC level for autoiris; potentiometer VR1 is on the camera front board. Refer to Figure 5. Use a small jeweler’s screwdriver to make adjustments. Turning the potentiometer opens and closes the iris to regulate light extremes. Turning the potentiometer clockwise opens the iris wider, allowing more light. Autoiris control is DIP switch selectable.

10 • Installation

XX152-02-00 Rev 1204 SurveyorVFT Fixed Camera Dome