Philips LDH 0462-00 User Manual

Philips LDH 0462/00 (VCM 6459/00T) Information Sheet

Power Connector

The camera can operate from either a 24V AC or 12V DC power supply. Connection is on an
8-pin mini-DIN socket.

AC Operation: Use pins 6 and 8.

DC Operation: Pin 5 is +12V DC. Pin 2 is GROUND.

Iris Connection

A standard iris lens (one that has a built-in video amplifier and motor drive) can be connected
to the 3-pin mini-DIN connector on the rear of the camera.

Pin 1: GND
Pin 2: Video Out
Pin 3: +12V DC

The camera also has a standard 4-pin iris connector for use with a passive iris lens.

Back-Focus Adjustment

1. Set the lens distance to infinity

2. Aim the camera at an object that is at least 15m away.

3. Make a preliminary iris adjustment if necessary (see next section)

4. Loosen the lens mounting ring by means of the small set-screw on top of the camera
front.

5. Turn the lens with the mount adjustment ring until the video picture is in focus. This is
most accurate when the iris is fully open.

6. Tighten the lens mount ring by means of the set screw.

Iris Adjustment (Manual iris lenses)

1. Install the camera in the position where it will be used. Aim and focus the camera on
the area to be monitored.

2. Set the iris to its minimum aperture. The camera will now show a low contrast picture
with ‘noise’.

3. Open the iris slowly. The picture contrast will improve and the ‘noise’ will gradually
disappear.

4. Set the iris to a position at which the details in the larger white parts of the picture are
not washed out.

Iris Adjustment (Auto-iris lenses)

Auto-iris lenses are usually pre-adjusted for an acceptable image under average conditions.
Re- adjustment may be necessary to obtain optimum picture quality.

1. Aim the camera at a grey-scale test chart.

2. Set the ‘ALC’ variable resistor on the lens to its Average position.

3. Connect an oscilloscope to the iris control output (3-pin DIN pin 2). Adjust the setting
of the ‘Level’ variable resistor until the maximum signal from the scene (peak white)
reads 1 volt.

Note: If you have no suitable test chart, aim the camera at the scene you want monitored and
proceed as described above.

When the image on the monitor shows an extremely high or low contrast, follow these steps:

HIGH CONTRAST: Slowly turn the ‘ALC’ adjustment to Peak and the ‘Level’ adjustment to

Low.

LOW CONTRAST: Slowly turn the ‘ALC’ adjustment to Average and the ‘Level’ adjustment to
High.

Also consult the documentation that came with your lens.

Passive auto-iris lenses need no adjustment.