This is the PDF file of text No.TE04EA-1.
No.TE04EA-1.pdf 98.3.20
2. Noise Transmission Paths and Basic Concepts for Noise Suppression
2.1. Principle of Noise Suppression
Noise Transmission Paths
4
4
Radiation
noise
1
Noise source
Conductive
noise
Conductive
noise
3 Radiation noise
Radiation
noise
Equipment or
device exposed
to noise
2
1 Conduction
2 Radiation
3 Conduction
Radiation
4 Radiation
Conduction
Noise emitted from a source is transmitted through many
complicated paths, sometimes through a conductor and sometimes
as radiation. When it reaches a device or equipment, that equipment
is exposed to noise.
–– 4 ––
[Notes]
This is the PDF file of text No.TE04EA-1.
No.TE04EA-1.pdf 98.3.20
2. Noise Transmission Paths and Basic Concepts for Noise Suppression
2.1. Principle of Noise Suppression
Principle of Noise Suppression
5
4
EMI filter
1
Noise source
EMI filter
EMI filter
3
Equipment or
device exposed to
noise
EMI filter
2
A
Shielding
B
Shielding
How to suppress noise
(Side A)
(Side B)
1 Conduction............................................. EMI filter
EMI filter
2 Radiation................................................ Shielding
Shielding
Radiation............... EMI filter
Shielding
Conduction.............. Shielding
EMI filter
3 Conduction
4 Radiation
In order to properly suppress noise, we must know the noise source
and how it is transmitted. If the initial check is inaccurate, we
cannot judge whether the noise suppression technique has failed
or the technique was applied to an incorrect source.
The principle of noise suppression is to use an EMI filter for
conducted noise and shielding for radiated noise.
–– 5 ––
[Notes]