ATI Technologies DA416 Betriebs- und Wartungshandbuch - Seite 3

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ATI Technologies DA416 Betriebs- und Wartungshandbuch

To avoid any crosstalk through the summing network, CR3 across R13 prevents

nonlinear clipping of U5A and therefore maintains an extremely small common

point voltage at U5A pin 13. If any single output or any combinations of outputs

are driven too high, they will light the clipping LED. Each clipping indicator

monitors only four outputs, making it easy to locate the "hot" output.

Your DA operates from a bipolar 15VDC regulated supply. The power supply is

designed for minimum susceptibility to power line transients and conducted RFI

using ferrite beads, double capacitive bypasses and a non-concentric wound

semi-toroidal power transformer.

INSTALLATION

MOUNTING

Your ENCORE SERIES DA is designed for rack mounting on standard E.I.A. 1

3/4-inch centers. Each unit dissipates approximately 10 watts and is ventilated

through slots in the rear panel.

WIRING

There are three wire grounded plugs. The power line ground could cause a loop

with your studio ground. If you are sure your studio ground will provide adequate

protection to personnel in case of an AC line short to chassis, a 3 to 2 AC

adapter can be used to isolate the power line ground. We recommend that the

adapter be removed and the power line ground reconnected prior to any service

work requiring removal of the studio ground from the chassis.

To allow maximum flexibility in grounding in high RF environments, the DA circuit

grounds are isolated from case ground. For normal operation, add a ground

jumper from the barrier strip ground terminal to the chassis ground screw.

The four inch silver bearing low inductance copper strap which you are, of

course, using for your studio ground is not going to fit around the #6 chassis

ground screw on the amplifier rear panel. Run the strap to within a few inches of

the chassis and jump to the chassis ground screw with shield braid.

We have taken measures to keep RF out of your DA. This includes split and

bypassed input and output resistor networks, beaded, bypassed and isolated

power inputs, non-concentric wound power transformers, and double ground

plane PC boards. However, in a difficult broadcast application, any RF shielding

and suppression system is going to 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.

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