SAMLEX AMERICA INC. | 13
SECTION 5
| Limiting Electro-Magnetic
Interference (EMI)
5.1
!
CAUTION!
Conducted and radiated noises in this unit are limited as per the applicable
National / International Standards. Refer to the applicable standards given in
the specifications in Section 6.
This unit generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful
interference to radio communications. However, this does not guarantee that
interference will not occur in a particular installation. If this equipment does
cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to
try to correct the interference by one or more of the measures recommended
in the following paragraphs.
!
ATTENTION!
Bruits et rayonnement dans cette unité sont limitées que par la législation
nationale / normes internationales. Consulter les normes mentionnées dans les
spécifications de la Section 6.
Cet appareil génère, utilise et peut émettre une énergie de fréquence radio et,
s’il n’est pas installé et utilisé conformément aux instructions, peut causer des
interférences nuisibles aux communications radio. Cependant, cela ne garantit
pas qu’aucune interférence ne se produira dans une installation particulière.
Si cet équipement provoque des interférences nuisibles à la réception radio ou
télévision, ce qui peut être déterminé en éteignant l’équipement, l’utilisateur
est encouragé à essayer de corriger les interférences en prenant une ou plusieurs
des mesures recommandées dans les paragraphes suivants.
5.2 UN-INTENTIONAL RF NOISE GENERATED BY SWITCHED
MODE POWER SUPPLIES (SMPS)
Switched Mode Power Supplies (SMPS) employ high frequency switching (25-170 KHz in
these units) and thus, are a source of radio interference, a recipient of radio interference
and a conduit of radio interference. (Older Linear Type, low frequency 50 / 60 Hz trans-
former based power supplies do not employ high frequency switching voltages and will be
quieter as compared to SMPS).
The primary emission sources originate in the switching devices due to their fast switching
current transitions: harmonics of the switching frequency and broadband noise created by
under-damped oscillations in the switching circuit. The secondary source is from the bridge
rectifier, both rectifier noise and diode recovery. The noise is both conducted and radiated
through the input power cord and the DC output wiring to the radio.
Summary of Contents for SEC-1212P
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