B82477G4684M EPCOS Inc, B82477G4684M Datasheet - Page 4

• Manufacturer Part Number: B82477G4684M
• Description: Inductor,Ferrite,680uH,20+% Tol,20-% Tol,5050-Case
• Manufacturer: EPCOS Inc

2
2.1
For as long as electronic transmission equipment such as radio, television, and telephone has been
in existence, it has had a history of susceptibility to interference from other electronic devices. Legal
regulations on interference suppression (electromagnetic and radio frequency interference, EMI
and RFI) have been in existence since 1928. These regulations protect transmission paths and re-
ception equipment by limiting the emitted interference.
In view of the increasing number of electrical and electronic appliances in use, not only the princi-
ples of interference suppression must be observed, but also, in the sense of electromagnetic com-
patibility (EMC), it must be ensured that all equipment is able to operate simultaneously without
problems. EMC is defined as the ability of electrical equipment to function satisfactorily in its elec-
tromagnetic environment without affecting other equipment in this environment to an impermissible
extent.
The European Communities’ EMC Directive (89/336/EEC) came into force on the 1. 1. 1996. It has
been transformed into corresponding legislation in the individual EU (European Union) member
states. With this, it has become mandatory to design electronic equipment to comply with the pro-
tection objectives of this Directive; i.e. to meet the requirements for electromagnetic emission and
electromagnetic immunity as laid down in the corresponding EN standards (European Standards).
The concept of EMC includes both electromagnetic emission (EME) and electromagnetic immunity/
susceptibility (EMS), see
Fig. 3
An interference source may generate conducted or radiated electromagnetic energy, i.e. conducted
emission (CE) or radiated emission (RE). This also applies to the propagation paths and to the elec-
tromagnetic susceptibility of disturbed equipment.
In order to work out economical solutions, it is necessary consider both phenomena, i.e. propaga-
tion and susceptibility, to an equal extent, and not just one aspect, e.g. conducted emission.
General Technical Information
Interference
Emission
EME
source
CE
RE
Electromagnetic compatibility (EMC)
Introduction
EMC terms
Propagation
Conducted
fig.
Radiated
EMC
3.
Susceptibility
equipment
Disturbed
EMS
12
CS
RS
04/00
EMC = Electromagnetic
EME = Electromagnetic
EMS = Electromagnetic
CE
CS
RE
RS
= Conducted emission
= Susceptibility to
= Radiated emission
= Susceptibility to
compatibility
emission
immunity/susceptibility
conducted emission
radiated emission