Cadac R-Type Manuel d'utilisateur télécharger pdf (Page 115)

Appendices APP-I

Revision R2005-2 R-Type

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On the 1st January 1996, new European legislation known as the EMC Directive

came into force. The EMC Directive requires that all electronic equipment manufac-

tured or imported for sale in the EEC must not emit electromagnetic interference that

can impair the performance of other systems or sub-systems. Similarly, the product

must also be immune to a wide range of natural and man-made electromagnetic

interference in its operating environment. Many countries outside the EEC are also

developing or have already put into place similar legislation. In order to conform to

these rules, a number of changes were required to the basic design of our consoles

and modules. One of the main changes is:

All cable ‘screen’ connections are bonded to the frame.

The figure below shows the required connection scheme for XLR connectors.

Please note that in the case of ‘line’ or ‘free’ connectors (XLRs on cables), the 'pig-

tail' formed from the cable screening braid should be as short as practical and sol-

dered to the

shell ground tag

. Pin 1 is then connected to the 'pigtail' approximately

halfway between the

shell ground tag

and the start point of the cable screening braid.

The twisted pair should be left 'twisted' right up to the signal solder tags.

The chassis half of the connector is bonded to the metalwork with the usual nuts,

bolts and spiky washers. The solder tag should be as long as possible so that the

length of the 'short wire' is a minimum. The twisted pair (from the signal pins - pin 2 &

pin 3) are soldered onto the motherboard adjacent to the 'input RF filter' compo-

nents.

TW ISTED PAIR

WITH BRAIDED

SCREEN

STRAIN RELIEF

PIGTAIL

SH ELL GROUND TAG

XLR

M ETAL SHELL

WITH CONDUCTIVE FINISH

TW ISTED PAIR

M ETAL PANEL

SPIKY W ASH ER

LONG SOLDER TAG

SH O RT WIRE

TW ISTED PAIR TO FILTER ON PCB

XLR CHASSIS CON NECTOR WITH

CONDUCTIVE SURFACE AND

MULTI-POINT BOND TO SHELL

OF CABLE CONNECTOR

FIG A-1. XLR connections.

1 2 ... 110 111 112 113 114 115 116 117 118 119 120 ... 138 139

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Cadac R-Type Manuel d'utilisateur Page 115

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