ADDLESTONE BH184 설치 매뉴얼 - 페이지 2

{카테고리_이름} ADDLESTONE BH184에 대한 설치 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. ADDLESTONE BH184 4 페이지. Video launch amplifier / vda unit

PART 1: USING THE BH184 AS A VIDEO LAUNCH AMPLIFIER

INSTALLATION

Note 1: A Launch Amplifier is usually used in conjunction with a second video amplifier unit

installed at the monitor end of the cable run. For short cable runs up to about 300m the

BH184 unit may be used on its own.

Note 2: The BH184 unit will block telemetry signals – for video only.

The unit should be installed as close to the camera as is practical. The output cable of the

12V DC supply is connected to the spring-loaded connector labelled '12V DC'. Ensure the

positive wire is connected to the connector slot labelled '+'. The positive wire from the power

supply is marked with a light grey stripe. An LED in the top panel shows when power is

connected.

The video cable from the camera is connected to the BNC coax connector labelled 'VIDEO

IN 75R'. The outgoing coax cable is connected to one of the two output coax connectors

labelled 'VIDEO OUT 75R'. The unused output connector does not have to be terminated.

DIAGRAM 1 SHOWING A BASIC CCTV INSTALLATION

INCORPORATING A BH184 UNIT

(For clarity only one camera run is shown)

ADJUSTMENT

The BH184 unit is adjusted in the factory for Unity output so that an input signal of 1.0 Volt

peak to peak @75R will give an output signal of 1.0 Volt peak to peak @75R. For medium /

long cable runs it will be necessary to increase the output signal level. The BH184 unit has

two controls: one for signal amplitude (GAIN) and one for high frequency lift (HFL).

To increase the signal levels rotate the pots clockwise. If you are using the BH184 in

conjunction with a second amplifier unit, adjust the BH184 unit first.

The GAIN control will adjust the peak to peak amplitude of the video signal – this will

affect the brightness of the picture on the monitor.

The high frequency component of the video signal carries information on fine detail

and colour. For long cable runs the High Frequency Lift control may be set to

maximum if required.