Made in Japan
Manufacturer: SEIWA ELECTRIC MFG.CO.,LTD
Model: E04SR401938

Product Outline and Features

The full lineup of high-frequency band from low-frequency band.
To suit your needs, we offer various types, such as ring-type, split type, flat type etc.
Low-frequency splitting type is equivalent to the characteristics of ring type.

Specifications

SR type: Intended to be fastened with a supplied binding band.
SR-A,SR-F type : Intended to be fixed to a cable.
SR-AB type : The plastic resin case is black.
E04SRB : Intended to be fixed to an enclosure. Mounting hole diameter range 4.8-4.9 mm, Thickness range 0.5-2.0mm (for E04SR200917)
E04SRB: Intended to be fixed to an enclosure. Mounting hole diameter range 4.8-4.9

Dimensions

Method of mounting

E04SR-A/E04SR-AB

It can be fixed easily with the nail of a resin case

E04SRM

It is fixable by the pedestal (E04SRMB) of an option.

E04SR/E04SRS

It can be fixed with binding band.

E04SR401938

It can be fixed with M4 size screws.

E04SR200917

It is fixable by the pedestal (E04SRB) of an option.

Technical Information

Relation between No. of Turns/Cores and Impedance.

If impedance is insufficient as a result of the cable passing through the ferrite core once (1 turn), impedance can be increased by passing the cable through it twice or three times. Impedance increases with the square of the number of turns. However, as shown in Fig. 1, because of line capacity, impedance begins to go down when the frequency exceeds a certain level, so the frequency employed should be determined carefully.

When the number of cores in use is increased, impedance goes up in proportion to the number of cores, as shown in Fig. 2.

Gaps

A split ferrite core is easily fitted to a cable fixed in place. The split core is designed to eliminate the joint gap. As shown in Fig. 3, the characteristics of the split ferrite core are almost the same as those of the non-split (standard) ferrite core. However, if dust or foreign matter should get into the joint and produce a gap, the impedance would considerably decline at low frequencies as indicated by the curve representing the gapped ferrite core. Therefore, when fitting the split core, care should be taken not to allow dust to get into the joint.

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