Lectrosonics DM812 Manuel d'utilisateur télécharger pdf (Page 6)

DM Series Installation Guide

LECTROSONICS, INC.

Installing the DM System into a Rack

The DM1624F and DM1612F occupy two rack spaces.

The DM812 occupies a single space. Mount with 4 rack

screws using the appropriate mounting holes. It is rec-

ommended to use nylon washers to prevent damage to

the front panel’s ﬁnish when tightening the screws.

Do not obstruct the fan port on the 2RU models.

For North American installations, connect the Power

Cable supplied with the unit between the DM and a

stable power source. DM processors have internal

switching power supplies that can tolerate voltages

rangingfrom100VACto240VAC.Useanapproved

power cable for installations outside North America.

Cables

It is recommented to use lacing bars for cable strain

relief when mounting in a rack. Use only professional

audio cable with proper shielding - typically, two con-

ductor plus ground/shield.

Audio Connections

The analog audio inputs and outputs are connected

through 5 pin de-pluggable connectors. Strip the insula-

tionback1/8to3/16”butdonottin(applysolderto)

the leads. Insert the wire into a de-pluggable connec-

tor, leaving less than 1 mm of bare wire exposed, then

tighten the retaining screw.

5-pin depluggable

connector

Do not leave more than

1 mm of exposed wire

beyond the connector.

Do not tin (apply solder

to) leads

Retaining Screw

(Do not overtighten)

Note the labeling on the DM Chassis for the positive

and negative leads. Ground is shared between two

connections (the center pin). For balanced connec-

tions, all three leads can be connected.

NOTE: The DM Series does not have a “pin 1

problem.”

Audio Inputs

Unbalanced Sources

Unbalanced audio sources (positive and ground)

includeitemssuchasconsumerVCR’s,DVDplay-

ers, etc., and may use both two wire and three wire

cables. In either case, the positive output from the

source should be connected to the appropriate positive

(+)inputontheDM.Theshieldornegative(–)output

shouldbeconnectedtheDM’snegative(–)input.Two

wire cables should have a jumper between the DM

negative input and ground. Three wire cables should

have the shield connected to the DM’s ground input and

theshieldandnegative(–)leadsjoinedtogetheratthe

unbalanced source end.

WARNING: Do not activate phantom power for

unbalanced sources. Refer to online help ﬁles

after the software is installed.

Balanced Sources

Balanced differential sources from external equipment

and microphones should be wired according to Bal-

anced source to DM input (3-Wire). (See illustration.)

When connecting balanced sources to the DM, it is im-

portant to not connect chassis ground (shield) to either

signal conductor.

Balanced source to DM input

(3-Wire)

DM In

Source

Shield

DM In

Source

Unbalanced source to DM input

(2-Wire)

Shield

DM In

Source

Unbalanced source to DM input

(3-Wire)

Shield

Hardware Installation

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Lectrosonics DM812 Manuel d'utilisateur Page 6

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