ATI Technologies DMA103 Посібник з експлуатації та технічного обслуговування - Сторінка 4

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ATI Technologies DMA103 Посібник з експлуатації та технічного обслуговування

GROUNDING

Operation in high RF broadcast environments requires special attention to

grounding and shielding. The chassis must be grounded directly to a good, low

impedance studio ground system. Input and output connections must be properly

shielded and free of ground loops. It may even be necessary to add shielding to

the DC input leads to avoid RF pickup.

POWER DISTRIBUTION

Multiple NANOAMPS sharing a single wall-wart power supply should be looped

through each other using the DC interconnects cables P/N20602-1. Hum and

noise performance of the units can be degraded by poor DC ground connections

between units sharing a common supply. Use of the recommended rack and

desk mounting kits will assure a good ground connection between units by firmly

strapping their chassis together. CAUTION! The outer shell of the DC

interconnect cables is positive relative to the chassis. Do not allow a DC cable

plugged into a powered unit to hang loose where it can short against the chassis

or rack frame.

SETUP

Before mounting your product in a rack, remove the top cover (4 upper side

screws) and set the preamp gain jumper to match the nominal input line level

(DA103) or for the DMA103 set the preamp gain with the DIP rocker switch to the

highest level that does not cause input circuit clipping. Hot mics will require lower

gains (20 – 30dB) while low output mics will require higher gain settings (40 –

60dB). Also set phantom power on or off as needed and select line (+4dBm) or

mic level (-50dBm) outputs with jumper plugs P1, P2 or P3.

MOUNTING

These may be rack mounted one, two, or three across in a standard EIA 19" rack

and will require only 1 3/4" of vertical space. Rack mount kit P/N20604-501

mounts a single unit, P/N20604-502 mounts two units and P/N20604-503 mounts

three units. Each kit provides a different size pair of rack mounting brackets and

one or two horizontal joiner plates, P/N 20580-1, each with four 4-40 X 5/16" oval

head screws. The joiner plates mount into tapped holes on the bottom of two

side-by-side units, using the supplied screws, while the rack mount brackets

mount under the existing 6-32 cover securing screws on the front sides of the

units.

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