IRT VA-700 Скачать руководство пользователя страница 9

 

VA-700 

I.R.T. Communications Pty Ltd | www.irtcommunications.com 

 

 

Page 9 of 23

 

Revision 10 

INSTALLATION

 

 

Pre-installation: 

 

Handling: 

 
This equipment may contain or be connected to static sensitive devices and proper static free handling precautions 
should be observed. 
 
Where  individual  circuit  cards  are  stored,  they  should  be  placed  in  antistatic  bags.  Proper  antistatic  procedures 
should be followed when inserting or removing cards from these bags. 
 

Power: 

 
AC mains supply:  

Ensure that operating voltage of unit and local supply voltage match and that correct rating 
fuse is installed for local supply. 

 
DC supply:  

Ensure that the correct polarity is observed and that DC supply voltage is maintained within 
the operating range specified. 

 

Earthing: 

 
The earth path is dependent on the type of frame selected. In every case particular care should be taken to ensure 
that the frame is connected to earth for safety reasons. See frame manual for details. 
 

Signal earth: 

For safety reasons a connection is made between signal earth and chassis earth. 

 

No attempt should be made to break this connection. 

 

Installation in frame or chassis: 

 
See details in separate manual for selected frame type. 
 

Video connections: 

 

Connect  the  video  input  to  one  of  the  two  input  connectors,  and if the input is not to be looped, terminate the 
other input with a 75 Ohm termination plug. 
 
If you require the hum stripping feature to work remember that the input cable sheath must not be connected to 
ground except at its source. Connect outputs as required. 
 
Connect as many outputs as required. Each video output must be connected to a 75 

 terminated load for proper 

output level. 
 

Содержание VA-700

Страница 1: ...VA 700 I R T Communications Pty Ltd www irtcommunications com Revision 10 Analogue Video Distribution Amplifier User Manual...

Страница 2: ...handle omitted S N 9500000 04 27 11 1996 AJP CVA 3120 sub document included S N 9500000 05 12 01 2001 AL IRT Border page added for PDF format 00COMMON doc file contents added S N 9500000 06 05 07 2002...

Страница 3: ...es only 11 DL 700 Delay filter sub module 11 General Description 11 Technical Specifications 12 Configuration 13 Installation 13 AVD 3120 Video sync failure detector 14 General Description 14 Technica...

Страница 4: ...onditions dangerous potentials may exist in some circuits when power controls are in the OFF position Maintenance personnel should observe all safety regulations Do not make any adjustments inside equ...

Страница 5: ...RGB signal situations The video gain may be varied by 3 dB from the front panel Internal preset controls allow adjustment of the amplifier frequency response optimisation of the longitudinal hum rejec...

Страница 6: ...ential gain 0 1 at 4 43 MHz 12 5 87 5 APL Differential phase 0 1 at 4 43 MHz 12 5 87 5 APL Noise 70 dB unweighted Cross talk 75 dB between modules Transit time 22 at 4 43 MHz Cable Equalisation Up to...

Страница 7: ...e using the VA 700 to distribute pulses or sub carrier the clamp feature should be disabled LK 1 installed otherwise LK 1 should be removed External clamp reference An external video signal can be use...

Страница 8: ...s of the R 70 position the R 71 position and the rear pad of the R 80 position The external clamp reference from the GREEN VDA can be looped through from output connector 10 on the GREEN VDA to output...

Страница 9: ...ge specified Earthing The earth path is dependent on the type of frame selected In every case particular care should be taken to ensure that the frame is connected to earth for safety reasons See fram...

Страница 10: ...VA 700 I R T Communications Pty Ltd www irtcommunications com Page 10 of 23 Revision 10 Front rear panel connector diagrams O P 1 O P 3 LOOPED I P O P 9 O P 5 O P 7 O P 2 O P 4 I P O P 10 O P 6 O P 8...

Страница 11: ...the delay when in operating configuration The DL 700 provides two sockets for fitting DIL delay lines or filters one of up to 40 pins and one of up to 48 pins Pins normally used for grounding connect...

Страница 12: ...fier only Input Type DC coupled Impedance 75 Maximum Level 2 V p p 0 dB gain Output Type DC coupled Impedance 75 source terminated Gain 3 dB Adjustable by fitting programming resistor Power requiremen...

Страница 13: ...supporting VDA Variable delay To configure the variable delay section use the link pads located near SK 2 Enable Connect LK 1 LK 2 and LK 3 LK 4 Disable Connect LK 2 LK 3 and cut links LK 1 LK 2 and L...

Страница 14: ...tribution amplifier for indicating loss of incoming video signals to the VDA An LED is fitted to the sub module which extends through the front panel of the VA 700 and a relay closure alarm output is...

Страница 15: ...s after sync loss Alarm reset 800 ms after sync return Indicators alarms Visual indicators VIDEO FAIL ALARM LED Alarm output Relay circuits operated from alarm logic Changeover relay contact set Relay...

Страница 16: ...the VDA in order to fit the AVD 3120 and the performance of the VDA will not be affected by the inclusion of the AVD 3120 AVD 3120 If a second equaliser sub module is fitted to the VA 700 as is the c...

Страница 17: ...n variations Control may be by either a DC control signal or via a simple potentiometer connected to the VDA This makes the control suitable for both direct manual use or for operation at remote locat...

Страница 18: ...emote control connector on rear panel of VA 700 DC 0 12 Vdc connected to pin 3 of 3 pin remote control connector pin 1 Gnd on rear panel of VA 700 Response time constant 0 1 seconds Power Requirements...

Страница 19: ...N Where VO is the output voltage and VIN is the video input signal Maximum attenuation If greater attenuation is required the value of R 2 may be adjusted to provide the necessary gain range Please no...

Страница 20: ...o remote connection on rear assembly using the three pin IDC socket provided The remote gain control potentiometer should be wired as follows Gain adjustment Under normal circumstances no adjustments...

Страница 21: ...provided Standard EQ 1227 equaliser sub module Optional Instruction manual included in VA 700 VA 700T manual TS01ABE tiny slide switch for mounting on VA 700 PCB to switch between EQ 1227 and VA 700 i...

Страница 22: ...iser and position 2 to the EQ 1227 equaliser If only EQ 1227 equalisation is to be required the PCB track connecting one side of switch SW 1 should be cut and a link soldered between the centre contac...

Страница 23: ...Warranty on components shall be extended by IRT only to the extent obtainable from the component supplier Equipment return Before arranging service ensure that the fault is in the unit to be serviced...

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