Description Of Back Focus And The A-I Connector - profiline TV7331 Installation Manual

8.4 Description of back focus and the A-I connector

The back-focus setting changes the distance between the CCD element and the lens..
1. Before attaching the lens, make sure that the distance between the
CCD element and the lens holder is selected correctly. For C-mount
lenses, increase the distance to the CCD element.
2. Using the screwdriver supplied, unscrew the fixing screw (1).
3. Now turn the adjusting wheel (2) to set the distance between the CCD element
and the lens so that the image is in focus. For variofocal lenses, adjust the
back-focus to the two focal extremes.
4. Following adjustment, tighten the fixing screw.
Note:
If you cannot obtain a clearly focussed image by adjusting the lens, check and adjust the back-
focus setting if necessary.
Possible lens types
Four types of lens can be used with this camera series. These include
Lenses with fixed and manual shutter control
Lenses with automatic shutter control (DC/DD and VD)
Lenses with direct control (DC/DD)
Autoiris connections
DC connection
PIN 1 Damping -
PIN 2 Damping +
PIN 3 Driving +
PIN 4 Driving -
36
Video connection
PIN 1 Voltage
PIN 2 Not used
PIN 3 Video signal
PIN 4 Shielding