EN 61248-7:1997

SLOVENSKI STANDARD
01-september-2002
Transformers and inductors for use in telecommunication and electronic
equipment - Part 7: Sectional specification for high-frequency inductors and
intermediate frequency (IEC 61248-7:1997)
Transformers and inductors for use in electronic and telecommunication equipment --
Part 7: Sectional specification for high-frequency inductors and intermediate frequency
transformers on the basis of the capability approval procedure
Transformatoren und Drosseln für elektronische und nachrichtentechnische
Einrichtungen -- Teil 7: Rahmenspezifikation für HF-Drosseln und ZF-Transformatoren
auf der Grundlage der Befähigungsanerkennung
Transformateurs et inductances destinés aux équipements électroniques et de
télécommunications -- Partie 7: Spécification intermédiaire pour les inductances à haute
fréquence et pour les transformateurs à fréquence intermédiaire sur la base de la
procédure d'agrément de savoir-faire
Ta slovenski standard je istoveten z: EN 61248-7:1997
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME
CEI
INTERNATIONALE
IEC
61248-7
INTERNATIONAL
QC 260600
STANDARD
Première édition
First edition
1997-06
Transformateurs et inductances destinés
aux équipements électroniques et de
télécommunications –
Partie 7:
Spécification intermédiaire pour les inductances
à haute fréquence et pour les transformateurs
à fréquence intermédiaire sur la base de la
procédure de l'agrément de savoir-faire
Transformers and inductors for use in electronic
and telecommunication equipment –
Part 7:
Sectional specification for high-frequency
inductors and intermediate frequency transformers
on the basis of the capability approval procedure
 IEC 1997 Droits de reproduction réservés  Copyright - all rights reserved
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For price, see current catalogue

61248-7  IEC:1997 – 3 –
CONTENTS
Page
FOREWORD . 5
Clause
1 Scope. 7
2 Normative references . 7
3 Preparation of the detail specification . 9
3.1 General . 9
3.2 Ratings and characteristics . 11
3.3 Outline drawings and winding schematic diagram . 11
4 Inspection requirements to be listed in the detail specification . 11
4.1 Conformance inspection. 11
4.2 Design verification . 13
5 Detail specification . 13
Blank detail specification . 15
Annex A – Test methods peculiar to coils or intermediate frequency transformers. 29

61248-7  IEC:1997 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_________
TRANSFORMERS AND INDUCTORS FOR USE IN ELECTRONIC
AND TELECOMMUNICATION EQUIPMENT –
Part 7: Sectional specification for high-frequency inductors
and intermediate frequency transformers on the basis of the
capability approval procedure
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization
for Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical reports or guides and they are accepted by the National Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61248-7 has been prepared by IEC technical committee 51:
Magnetic components and ferrite materials.
This standard is intended for use in the IEC Quality Assessment System for Electronic
Components (IECQ).
The operation of the IECQ is governed by IEC QC 001001 and IEC QC 001002. Specifications
written for components assessed under this scheme, and their use in the scheme, are the
subject of IEC Guide 102.
The text of this standard is based on the following documents:
FDIS Report on voting
51/441/FDIS 51/460/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
The QC number that appears on the front cover of this publication is the specification number
in the IECQ system.
Annex A forms an integral part of this standard.

61248-7  IEC:1997 – 7 –
TRANSFORMERS AND INDUCTORS FOR USE IN ELECTRONIC
AND TELECOMMUNICATION EQUIPMENT −
Part 7: Sectional specification for high-frequency inductors
and intermediate frequency transformers on the basis of the
capability approval procedure
1 Scope
This part of IEC 61248 specifies how to prepare detail specifications for high-frequency
inductors and intermediate frequency transformers between 10 kHz and 2 GHz for use in
electronic and telecommunication equipment to be released under the terms of IEC 61248-1
(QC 260000) capability approval. It includes a blank detail specification (BDS), which shows
the format and indicates which tests are considered to be appropriate to this type of
component, although the final selection of tests to be included in the inspection schedule is at
the discretion of the specification writer. It also lists appropriate ratings and characteristics.
The components covered by this part of IEC 61248 are essentially concerned with high-
frequency inductors and intermediate frequency transformers of signals which are mainly used
for electronic equipment.
2 Normative references
The following normative documents contain provisions, which, through reference in this text,
constitute provisions of this part of IEC 61248. At the time of publication, the editions indicated
were valid. All normative documents are subject to revision, and parties to agreements based
on this part of IEC 61248 are encouraged to investigate the possibility of applying the most
recent editions of the normative documents listed below. Members of IEC and ISO maintain
registers of currently valid International Standards.
IEC Guide 102: 1996,
Electronic components – Specification structures for quality assessment
(Qualification approval and capability approval)
IEC QC 001001: 1986, Basic rules of the IEC Quality Assessment System for Electronic
Components(IECQ)
Amendment 2 (1994)
IEC QC 001002: 1986, Rules of procedure of the IEC Quality Assessment System for
Electronic Components (IECQ)
Amendment 2 (1994)
IEC QC 001004: Specifications list
IEC QC 001005: Register of firms, products and services approved under the IECQ System,
including ISO 9000
IEC 60068-2-2: 1974, Environmental testing – Part 2: Tests – Tests B: Dry heat
IEC 60068-2-3: 1969, Environmental testing – Part 2: Tests – Test Ca: Damp heat, steady
state
IEC 60068-2-6: 1995, Environmental testing – Part 2: Tests – Test Fc: Vibration (sinusoidal)

IEC 60068-2-14: 1984, Environmental testing – Part 2: Tests – Test N: Change of temperature
Amendment 1 (1986)
61248-7  IEC:1997 – 9 –
IEC 60068-2-20: 1979, Environmental testing – Part 2: Tests – Test T: Soldering
Amendment 2 (1987)
IEC 60068-2-21: 1983, Environmental testing – Part 2: Tests – Test U: Robustness of

terminations and integral mounting devices
Amendment 2 (1991)
Amendment 3 (1992)
IEC 60068-2-27: 1987, Environmental testing – Part 2: Tests – Test Ea and guidance: Shock
IEC 60068-2-29: 1987, Environmental testing – Part 2: Tests – Test Eb and guidance: Bump
IEC 60410: 1973, Sampling plans and procedures for inspection by attributes

IEC 61007: 1994, Transformers and inductors for use in electronic and telecommunication

equipment – Measurement methods and test procedures
IEC 61248-1: 1996, Transformers and inductors for use in electronic and telecommunication
equipment – Part 1: Generic specification
ISO 128: 1982, Technical drawings – General principles of presentation

ISO 129: 1985, Technical drawings – Dimensioning – General principles, definitions, method of

execution and special indications
3 Preparation of the detail specification
This standard is intended to be used for the preparation of detail specifications for high-
frequency inductors and intermediate frequency transformers released under the terms of the
IEC 61248-1 (QC 260000) capability approval procedure.
It is intended for use by the following originators:
a) a customer wishing to procure high-frequency inductors and intermediate frequency
transformers that are within the scope of the approved capability of his supplying component
manufacturer, e.g. for detail specifications (DS);
b) a capability approved manufacturer of high-frequency inductors and intermediate
frequency transformers wishing to prepare specifications for his own products which are
within the scope of his capability approval.
NOTES
1 The detail specification should take the form of the BDS shown in clause 5, particularly in respect of the
front page format and, in principle, in respect of the presentation of the inspection requirements.
2 Unless otherwise specified, all the tests shown in the BDS, with the exception of the rotating torque,
characteristic under pressure, strength of adjusting mechanism, resonance frequency and inductance tests
given in annex A, are taken from IEC 61007. Those shown underlined concern operating characteristics of
fundamental importance and it is strongly recommended that these are selected by the specification writer for
inclusion in the detail specification. The tests shown in plain type are listed for the convenience of the
specification writer, and tests should be selected from them according to the particular application of the
component.
3 The specification writer may specify tests and sampling levels different from, less than, or additional to
those given in the BDS.
3.1 General
3.1.1 Where additional tests of a type not defined or invoked in this specification or
IEC 61007 are required, these shall be fully specified in the detail specification.

61248-7  IEC:1997 – 11 –
3.1.2 Any tests considered as being destructive shall be so denoted in the test schedule by
the addition of the notation '(D)'.
NOTE – The use of this notation is not illustrated in the BDS.
3.1.3 Tests shall be grouped in the schedule according to the level of sampling required and,
unless otherwise indicated (see 4.1 b)), in the order of testing required. Where 100 % testing is
not required, inspection levels and acceptable quality levels shall be selected from IEC 60410.
3.1.4 The completed detail specification shall be allocated a component identity number and
issue status by the originator.
NOTES
1 This number is chosen by the originator (manufacturer or customer) within his own system. It is thus not
subject to any external rules or codification.
2 In the case of a manufacturer's detail specification for a standard catalogue item which the manufacturer
wishes to be listed in IEC QC 001004, the national committee will allocate an appropriate number from its
register.
3.1.5 A num
...