Not for reproduction

CISPR/A/WG1(Yamanaka-Sugiura)04-01

Original: English

September 2004

INTERNATIONALS ELECTROTECHNICAL COMMISSION

INTERNATIONAL SPECIAL COMMITTEE
ON RADIO INTERFERENCE (CISPR)

Subcommittee A: RADIO INTERFERENCE MEASUREMENT AND STATISTICAL METHODS

WG1: EMC INSTRUMENTATION SPECIFICATIONS

Subject: Maintenance of CISPR 17

-

Status of the usage of CISPR 17 in the Japanese industry and proposal of its
reorganization -

Reference: CISPR 17 (1981-01): Methods of measurement of the suppression characteristics of

passive radio interference filters and suppression components

1. Introduction

The present CISPR 17 was established in 1981 to specify the insertion loss measurements
mainly for high-power mains filters. At the meeting of CISPR/A/WG1 held in Munich, Germany, on
29 and 30 March 2004, the chairman asked Japanese experts to provide input with respect to the
effectiveness of CISPR 17 and the need of its maintenance [CISPR/A/WG1(Secretary)04-02]. In
response to this request, this document provides a report on the survey made with Japanese EMI
filter manufactures.

2. Current Utilization of CISPR 17 in the Japanese industry

Table 1 shows measurement methods for characterizing various EMI suppression devices that
are currently used in EMI filter industry. EMI filter manufactures employ the CISPR17 insertion
loss measurements on power line filters, but they use other measurement methods for signal line
EMI filters: i.e. impedance measurements and S-parameter measurements.

As a result, the specifications of existing CISPR 17 seem to be still valid for the insertion loss of
EMI suppression filters especially designed for large-current power lines. However, as a tremen-
dous number of small-sized EMI filters are used in various electronic devices, we consider that
the CISPR 17 should be revised to include some new measurement methods for characterizing
various types of modern EMI filters.

3. Other related standards

As far as we know, the related standards for insertion loss measurement are as follows:

[1] MIL-STD-220A:1959, Method of Insertion-loss Measurement.

[2] ANSI C63.13-1991, American National Standard Guide on the Application and Evaluation of
EMI Power-Line Filters for Commercial Use.

[3] IEC 60938-1 Ed. 2.0:1999, Fixed inductors for electromagnetic interference suppression –Part
1:Generic specification

Section 9 (No-Load, 50

Ω

Insertion-Loss Test Methods) of [2] describes CISPR 17 as a reference

document and says “Detailed test methods are given in CISPR 17.” In addition, Section 4.8
(Insertion loss) of [3] states “The measurement method shall be selected from those described in
CISPR 17.”

Judging from these situations, we consider that it is difficult to withdraw the existing CISPR 17.

4. Conclusion (Proposal of reorganization of CISPR17)

The present CISPR 17 is very old but still valid regarding the insertion loss measurements used
for ac power line filters. It is also referred to in some product standards.

However, various electronic devices use innumerable sophisticated EMI suppression filters of
different types such as listed in Table 1. Hence, those filters need to be characterized in author-
ized measurement methods. As there is no standard available, Japanese A/WG1 proposes de-
velopment of the second part of CISPR 17, that is CISPR 17-2, to include new measurement
methods applicable to such EMI suppression devices, while the existing publication should be
maintained as CISPR 17-1.

Table 1 Various EMI suppression devices and applicable measurement methods

CISPR17

Symbol/ Circuit Diagram

Example

Insertion Loss

Impedance

S-
Paramete

Power Line
Filters

Non-
feedthrough
capacitors
and multi-
terminal

FigB-3, B-6, B-
7
Section 5.2.1.1

Feedthrough
capacitors
and LC filters

FigB-2
Section 5.2.1.2

Chokes

FigB-2
Section 5.2.2

Resisters

Section 5.2.3
(ref. CISPR
12, Section
7.1)

Comon
Mode Choke
Coils

New Method

Products

Signal Line
Filters

Resisters

Capacitors

Inductors/
Beads

Feedthrough
capacitors
and LC filters

Common
Mode Choke
Coils

Ferrite
Cores/
Absorbing
Clamps