Nikon XX152-02-00 - Manual (Page 20)

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);
4 – BLC (ON or OFF). ALC setting is for external autoiris and ELC setting is for internal autoiris. The
ght camera includes a switch to select having the day/night feature turned ON or OFF
Switch
day/ni
. If day/night is
rned ON, at a low light level the camera changes to monochrome mode and the resolution and sensitivity
V-phase adjustment; VR1 on the
top board is for autoiris adjustment. Refer to Figure 5.
Camera Synchronization
video. If the camera will be used in a line lock video application, the camera interface board is already set in
ne lock mode by default. Camera synchronization is DIP switch selectable, line locked or internal. The use of
potentiometer (pot) is typically included in video equipment
quiring 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
tu
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
If there is more than one unit in a system, the cameras have to be synchronized to ensure there is no roll of
li
line-locking synchronization using a V-phase
re
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