ATI Technologies ADA412XLR Kullanım ve Bakım Kılavuzu - Sayfa 3

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INSTALLATION

The ADA 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.

XLR inputs and outputs are wired with pins 2 as HI and pins 3 as LOW. Pin 1 (shield) of all

input and output connectors are permanently grounded in accordance with current AES

recommendations. The pin 1 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 the chassis. Active balanced outputs require a reference ground

connection to the receiving device for proper operation. This ground is carried through pin 1.

If the pin 1 shield ground is not carried through to the receiving device, the AC ground, rack

frame, or studio ground system may complete this ground. 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 ADA, 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.

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