Samlexpower SEC-1212CE Manuel du propriétaire télécharger pdf (Page 11)

7. Following additional guidelines may be followed to reduce

the effects of RF noise:

a. Use additional appropriate AC radio frequency interference

(RFI) power line filter immediately before the ac input of the

power supply.

Recommended: Corcom Inc. ( www.cor.com )

“Q” series. Filtered, ferrite coated cord set

(www.emceupen.com ) is another choice. These cord sets,

with integral line interference filters, reduce common and

differential mode interferences over a wide frequency range.

Because they are shielded, they are also effective against

radiated interferences. In addition to the built-in filter networks,

the cable conductors are coated with an RF absorbing ferrite

compound. This provides additional attenuation at high frequen-

cies that is lacking in most regular LC filters. The RF absorp-

tion of the ferrite-coated cable avoids resonance’s at high

frequencies, reducing the conducted and radiated RF noises

even further

b. Use additional appropriate DC radio frequency interference

(RFI) power line filter immediately after the DC output of the

power supply. Recommended: Corcom Inc.(www.cor.com )

“DA” / “DC” series

c. Twist the positive and negative wires from the output of the

power supply to the radio

d. The DC side positive and negative outputs of these power

supplies are isolated from the chassis. As explained at para-

graph 6 above, the noise currents are filtered to the chassis

ground and the chassis ground is connected to the earth

ground through the earth ground pin of the AC power outlet

receptacle. Avoid connecting (referencing) the DC negative

output terminal of the power supply to the earth ground.

e. Connect a 1/4” wave length of wire on the negative terminal of

the power supply. Connect one end of the wire to the negatvie

terminal and leave the other end free. The wave length corre-

sponds to the wave length of the interfering frequency. (May not

be practical for long wave lengths)

[ Formula: Wave length (Meters) = 300 / frequency in MHz ]

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Samlexpower SEC-1212CE Manuel du propriétaire Page 11