Speck-electronics SSM Bedienungsanleitung PDF herunterladen (Seite 59)

Chapter 5 Wiring and Other

Clock noise is one of the greatest enemies of the audio racks AC system.

If a synth or any microprocessor based device emits or somehow

couples its clock signal with the neutral or earth of its own power cable,

it will contaminate your AC system and carry the clock noise into other

equipment; almost always with undesirable results.

The earth connection exists to protect you, your equipment and possibly

your building from an electrical disaster. In a properly wired system, if

a 120 volt AC wire were to break within your equipment's chassis, it

should make contact with the Safety Earth Wire that is connected to the

chassis, and blow the fuse or trip the circuit breaker until the problem

has been corrected. Given the same circumstances, if the AC safety

ground has been defeated with a ground lift or the AC

service is incorrectly wired, the equipment's chassis and quite possibly

everything attached in that rack would be "live" with 120 volts.

In an electronics context, an earth provides a path for unwanted EMI

noise to be carried away from your audio equipment. If you disable

your earth with a ground lift or do not have a reliable earth connection,

the unwanted noise (EMI or RFI), will find an electrical path of least

resistance. That will most likely be your audio equipment and would

result in unwanted buzzes or hums.

In order for any audio signal, such as a synth signal to get from the synth

to the mixer, it requires a minimum of 2 conductors. One conductor is

the hot, or high, or whatever you are familiar with; the other conductor

is the ground or common. Additionally, all audio wires must be

protected from environmental occurrences such as EMI (Electro

Magnetic Interference) and RFI (Radio Frequency Interference) with an

outer shield. An outer shield protects the 2 inner conductors from

outside interference, and prevents that cable from inducing its signal

onto adjacent audio cables.

One common misconception is that the shield of a cable should act as

the common. This may be acceptable for guitar cords or semi-

professional applications, but not for professional applications. The

audio signals must be carried only by the 2 inner conductors and the

shield must act only to cover these 2 conductors without transmitting the

signal from one location to another. It is recommended that the shield

be attached to the common (ground) at one connector's end, and the

shield not be connected at the other connector's end. It is recommended

that all shields be connected at the mixer end, and the shields not be

connected at the other ends (synths, effects, power amps, etc.).

Clock Noise and AC

Proper Audio

Grounding

and Shielding

Safety Earth Connection

Electronics Earth

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