Samson UT-5 Bedienungsanleitung PDF herunterladen (Seite 35)

DA-5L Grounding Techniques

The DA-5L contains a switching power supply that will add an audible

hum to your audio signal if the unit is not plugged into a properly

grounded three-pin AC socket. Unless you’re using a “star ground

network” (see below), you must

not use an adapter to lift the ground

from the DA-5L AC cable.

If the DA-5L is correctly connected to a grounded three pin socket and

you still experience hum or buzz when using it with other audio devices,

there's a simple test to determine the source of the problem: with all

devices powered on and connected with audio cabling, physically

remove each device, one by one, from the rack. If the hum disappears

when a particular device is removed, you'll know that that device is the

culprit. If the offending device uses a two-prong plug (or an external

two-prong AC/DC adapter), you can try reversing the plug in the socket.

If that doesn’t work, you may need to physically ground that device’s

chassis by connecting a wire (called a

strap) from it to a grounded piece

of metal such as rack ears. Some pieces of equipment have a screw-

type ground post to which the strap can be connected; if not, you can

attach some kind of metallic binding post to the case itself.

In addition, you can minimize possible interference by planning your RF

antenna, audio, electrical, and computer cable runs so that they are as

far apart from one another as possible and so they don’t run parallel to

one another. If they have to cross, try to ensure that they do so at a 90°

angle (that is, perpendicular to one another). In particular, try to keep

audio cabling away from external AC/DC adapters

If you’re using the DA-5L in a fixed installation, you may want to invest

the time and money into creating a

star ground network for all your

audio devices. This is by far the best technique for avoiding grounding

problems. It involves using a formidable ground source such as a cold

water pipe or a copper spike driven into the earth. A thick grounding

cable is connected to that source and is then brought to a central distrib-

ution point; from there, individual cables are connected to each piece of

equipment. This setup also requires that you lift the ground plug of all

three-prong AC connectors, so there is the possibility of danger if it is

done incorrectly. We strongly recommend that you contract with a

qualified professional to carry out this or any kind of electrical work.

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Samson UT-5 Bedienungsanleitung Seite 35