ATI Audio DA206 Руководство по эксплуатации и техническому обслуживанию - Страница 3

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ATI Audio DA206 Руководство по эксплуатации и техническому обслуживанию

INSTALLATION

MOUNTING

Your DA is designed for rack mounting on standard EIA 1 3/4-inch centers. Each unit

dissipates approximately 10 watts and is designed for use in an office environment. Avoid

excessive heat buildup (such as might be due to nearby power amplifiers in unventilated

racks) to ensure maximum component life.

WIRING

AUDIO CONNECTIONS

XLR type inputs and outputs are wired with pins 2 as Hi and pins 3 as Lo. Pin1 (shield) of

all input and output connectors are permanently grounded in accordance with the latest

AES recommendations. The pin1 grounds are routed via a large low impedance ground

path directly to the chassis separately from any audio ground paths. Internal circuit

ground is also connected to the chassis for shielding through an independent path. AC

ground (green wire) is also separately grounded to chassis. Active balanced outputs

require a reference ground connection to the receiving device for proper operation. This

ground is carried through pin1. If the pin1 shield ground is not carried through to the

receiving device, the AC ground may complete this ground, rack frame or studio ground

system. Noisy grounds require excellent common mode rejection in the receiving device

for quiet system operation.

We have taken measures to keep RFI out of your Encore Series DA including split and

bypassed input networks, beaded, bypassed and isolated power inputs, nonconcentric

wound, semi-toroidal power transformers, double ground plane PC boards and a nice

enclosure to keep rain and snow off the circuit boards. However, in difficult broadcast

applications, the RF shielding and suppression system can be no better than the ground

system into which it is trying to dump the unwanted RF.

For optimal product

performance, be sure to have a good grounding system

ADJUSTMENTS

The Master and individual output level controls should all be set close to 2 o'clock to

provide nominal +4dBm outputs for a nominal +4dBu input. These settings allow +6/-

16dB output adjustment range around nominal, which will allow outputs of +10 to -12dBm

to be set. In addition the Master gain has +10dB to OFF adjustment range to compensate

for input level variations from -6dBu to input clipping at +24dBu.

Changing the position of the input gain compensates for lower level inputs setting jumper

plugs (P2, P3, P8, P9). These plugs add 14 or 24dB of extra gain to permit nominal inputs

of -20dBu and minimum inputs as low as -30dBu for +4dBm out.

The input paralleling jumper plugs (P4 & P5, P6 & P7, P10 & P11) are located under the

hood just behind the input XLR connectors. They must be used in pairs (e.g. P4 & P5

together) to properly jumper HI & LO input lines. These jumper plugs let you use a DA412

as a Quad 1x3, Stereo 1x6 or a Mono 1x12 DA.

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