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3. SIGNALS AND WIRING
(2) Ferrite core
A ferrite core is effective for noise reduction to approximately 10 MHz band of conduction noise and from
30 MHz to 100 MHz band of radiated noise. When shielding effectiveness of a shielded cable to outside
cabinet is not enough or conduction noise from a power supply line should be suppressed, it is
recommended to install a ferrite core.
Install a ferrite core as the part of the cable in the following illustration. If the part of installation is not
proper, the ferrite core will not be effective.
Installing ferrite cores to the input signal wires and cables will achieve more noise suppression effect.
The following shows an example.
Additionally, ESD-SR-250 (NEC TOKIN), E04SRM563218 (SEIWA ELECTRIC), etc. are also found.
The more the number of passing times through a ferrite core increases, the more effective it is. It is
recommended to pass it through twice or more.
120 mm or less
Model
ZCAT3035-1330 (TDK)
Note. The values include wires (reference values) and not guaranteed values.
Passed through once
3 - 12
Ferrite core
Impedance [Ω] (Note)
10 MHz to 100 MHz
80
Passed through twice
100 MHz to 500 MHz
150
Passed through three times
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