ATI Technologies ADA208XLR Panduan Pengoperasian dan Pemeliharaan - Halaman 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.
AUDIO CONNECTIONS
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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www.atiaudio.com