EN 61007:1997

SLOVENSKI STANDARD
01-september-2002
Transformers and inductors for use in electronic and telecommunication
equipment- Measuring methods and test procedure (IEC 61007:1994, modified)
Transformers and inductors for use in electronic and telecommunication equipment -
Measuring methods and test procedures
Transformatoren und Drosseln für die Anwendung in elektronischen und
nachrichtentechnischen Einrichtungen - Meßmethoden und Prüfverfahren
Transformateurs et inductances utilisés dans les équipements électroniques et de
télécommunications - Méthodes de mesure et procédures d'essais
Ta slovenski standard je istoveten z: EN 61007:1997
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
INTERNATIONAL
Deuxième édition
STAN DARD
Second edition
1994-10
Transformateurs et inductances utilisés
dans les équipements électroniques
et de télécommunications —
Méthodes de mesure et procédures d'essais
Transformers and inductors for use
in electronic and telecommunication
equipment —
Measuring methods and test procedures
© IEC 1994 Droits de reproduction réservés — Copyright - all rights reserved
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—3—
1007 ©IEC:1994
CONTENTS
Page
FOREWORD 7
Clause
1 Scope 9
2 Normative references 9
3 Terminology
4 Test procedures 21
4.1 Test and measurement conditions
4.1.1 Measurement uncertainty
Alternative test methods 21
4.1.2
4.2 Visual inspection
4.2.1 Safety screen position
4.2.2 Quality of solder joints
4.3 Dimensioning and gauging procedure
4.4 Electrical test procedures
4.4.1 Winding resistance 27
4.4.2 Insulation tests
4.4.3 Losses
4.4.4 Inductance
4.4.5 Unbalance
4.4.6 Capacitance
4.4.7 Transformation ratios
4.4.8 Resonant frequency
4.4.9 Signal transfer characteristics
4.4.10 Frequency response
4.4.11 Pulse characteristics
4.4.12 Voltage-time product rating
4.4.13 Total harmonic distortion
4.4.14 Voltage regulation
4.4.15 Temperature rise 89
4.4.16 Surface temperature 91
4.4.17 Phase test (polarity) 93
4.4.18 Screens
4.4.19 Noise 99
4.4.20 Corona test
4.4.21 Magnetic fields
4.4.22 Inrush current 109
— 5 —
1007 ©IEC:1994
Page
Clause
4.5 109
Environmental test procedures
4.5.1 General
4.5.2 Soldering
Robustness of terminations and integral mounting devices 4.5.3
4.5.4 Shock
4.5.5 Bump
Vibration (sinusoidal) 4.5.6
4.5.7 Acceleration, steady state
Rapid change of temperature (thermal shock in air)
4.5.8
Sealing 4.5.9
4.5.10 Climatic sequence
4.5.11 Damp heat, steady state 113
4.5.12 Dry heat
Mould growth 4.5.13
4.5.14 Salt mist, cyclic (sodium chloride solution)
115 4.5.15 Sulphur dioxide test for contacts and connections
4.5.16 Fire hazard
4.5.17 Immersion in cleaning solvents
115 4.6 Endurance test procedures
4.6.1 Short-term endurance (load run)
4.6.2 Long-term endurance (life test)

1007 ©IEC:1994 — 7 —
INTERNATIONAL ELECTROTECHNICAL COMMISSION
TRANSFORMERS AND INDUCTORS FOR USE
IN ELECTRONIC AND TELECOMMUNICATION EQUIPMENT -
MEASURING METHODS AND TEST PROCEDURES
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 cooperation 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, prepared by technical committees on
which all the National Committees having a special interest therein are represented, express, as nearly as
possible, an international consensus of opinion on the subjects dealt with.
3) They have the form of recommendations for international use 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.
International Standard IEC 1007 has been prepared by IEC technical committee 51:
Magnetic components and ferrite materials.
This second edition cancels and replaces the first edition published in 1990, and amend-
ments 1 and 2 (published in 1993), and constitutes a technical revision.
The text of this standard is based on the first edition of IEC 1007, amendments 1 and 2
and the following documents:
DIS Report on voting
51 (C0)309
51(CO)312
Full information on the voting for the approval of this standard can be found in the report
on voting indicated in the above table.

1007 ©IEC:1994 - 9 -
TRANSFORMERS AND INDUCTORS FOR USE
IN ELECTRONIC AND TELECOMMUNICATION EQUIPMENT -
MEASURING METHODS AND TEST PROCEDURES
1 Scope
This standard describes measuring methods and test procedures for inductors and trans-
formers for use in electronic and telecommunication equipment that may be involved in
any specifications for such components, in particular those forming part of the IEC Quality
Assessment System for Electronic Components (IECQ scheme).
2 Normative references
The following normative documents contain provisions which, through reference in this
text, constitute provisions of IEC 1007. At the time of publication, the editions indicated
were valid. All normative documents are subject to revision, and parties to agreements
based on IEC 1007 are encouraged to investigate the possibility of applying the most
recent editions of the normative documents indicated below. Members of IEC and ISO
maintain registers of currently valid International Standards.
IEC 27: Letter symbols to be used in electrical technology
IEC 44-4: 1980,
Instrument transformers - Part 4: Measurement of partial discharges
IEC 50, International Electrotechnical Vocabulary (IEV)
IEC 68-1: 1988, Environmental testing - Part 1: General and guidance
Amendment 1 (1992)
IEC 68-2: Environmental testing - Part 2: Tests
IEC 68-2-1: 1990, Environmental testing - Part 2: Tests - Tests A: Cold
Amendment 1 (1993)
IEC 68-2-2: 1974, Environmental testing - Part 2: Tests - Tests B: Dry heat
Amendment 1 (1993)
IEC 68-2-3: 1969,
Environmental testing - Part 2: Tests - Test Ca: Damp heat, steady
state
IEC 68-2-6: 1982,
Environmental testing - Part 2: Tests - Test Fc and guidance: Vibration
(sinusoidal)
1007 ©IEC:1994 - 11 -
IEC 68-2-7: 1983, Environmental testing - Part 2: Tests - Test
Ga and guidance: Accel-
eration, steady state
Amendment 1 (1986)
IEC 68-2-10: 1988, Environmental testing - Pa rt 2: Tests - Test J and guidance: Mould
growth
IEC 68-2-13: 1983, Environmental testing - Part 2: Tests - Test M: Low air pressure
IEC 68-2-14: 1984, Environmental testing - Part 2: Tests - Test N: Change of temperature
Amendment 1 (1986)
IEC 68-2-17: 1978, Environmental testing - Part 2: Tests - Test Q: Sealing
Amendment 4 (1991)
IEC 68-2-20: 1979, Environmental testing - Part 2: Tests - Test T: Soldering
Amendment 2 (1989)
IEC 68-2-21: 1983, Environmental testing - Part 2: Tests - Test U: Robustness of termin-
ations and integral mounting devices
Amendment 2 (1991), Amendment 3 (1992)
IEC 68-2-27: 1987, Environmental testing - Part 2: Tests - Test Ea and guidance: Shock
IEC 68-2-29: 1987, Environmental testing - Part 2: Tests - Test Eb and guidance: Bump
IEC 68-2-30: 1980, Environmental testing - Part 2: Tests - Test Db and guidance: Damp
heat, cyclic (12 + 12-hour cycle)
Amendment 1 (1985)
IEC 68-2-42: 1982, Environmental testing - Pa rt 2: Tests - Test Kc: Sulphur dioxide test
for contacts and connections
IEC 68-2-45: 1980, Environmental testing - Part 2: Tests - Test XA and guidance: Immer-
sion in cleaning solvents
IEC 68-2-52: 1984, Environmental testing - Part 2: Tests - Test Kb: Salt: mist, cyclic
(sodium chloride solution)
IEC 68-2-58: 1989, Environmental testing - Part 2: Tests - Test Td: Solderability,
resistance to dissolution of metallization and to soldering heat of Surface Mounting
Devices (SMD)
IEC 270: 1981, Partial discharge measurements

1007 ©IEC:1994 - 13 -
IEC 367-1: 1982,
Cores for inductors and transformers for telecommunications - Part 1:
Measuring methods
Amendment 1 (1984), Amendment 2 (1992)
IEC 551: 1987,
Determination of transformer and reactor sound levels
IEC 617, Graphical symbols for diagrams
IEC 651: 1979, Sound level meters
Amendment 1 (1993)
IEC 695-2: Fire hazard testing - Part 2: Test methods
IEC 695-2-2: 1991,
Fire hazard testing - Part 2: Test methods - Section 2: Needle-flame
test
IEC 695-2-4/0: 1991, Fire hazard testing - Part 2: Test methods - Section 4/Sheet 0:
Diffusion type and pre-mixed type flame test methods
IEC 695-2-4/1: 1991,
Fire hazard testing - Part 2: Test methods - Section 4/Sheet 1:
1 kW nominal pre-mixed test flame and guidance
ISO 3: 1973,
Preferred numbers - Series of preferred numbers
ISO 497: 1973,
Guide to the choice of series of preferred numbers and of series contain-
ing more rounded values of preferred numbers
ISO 1000: 1992,
SI units and recommendations for the use of their multiples and of certain
other units
3 Terminology
For the purpose of this standard the following definitions apply in addition to those of
IEC 50:
3.1 component:
A transformer or an inductor.
3.2 peak working voltage: The maximum instantaneous voltage for which the winding
insulation is rated under working circuit conditions.
3.3 pulse waveform parameters (see figure 1)
a) peak pulse amplitude, Urn : The maximum value of an extrapolated smooth curve
through the top of the pulse, excluding any initial "spike" or "overshoot", the duration of
which is less than 10 % of the pulse duration.
b) pulse duration, td : The time interval between the first and last instants at which the
pulse amplitude equals 50 % of the peak pulse amplitude.

Leading edge Pulse top Trailing edge
Pulse crest
Overshooti
% tJmf
Droop
Pulse duration
Rèturn backswing
td
Cycle time
t
Back
–10 —
swing
Rise Fall
time
time
Recovery time
tf
590/90
tr
NOTE - For clarity in illustrating droop, the 80% and 10% points have been used in constructing the line
which determines the border between the pulse top and the trailing edge.
Figure 1 - Pulse waveform parameters

1007 CD IEC:1994 - 17
c) pulse rise time, t
r: The interval between the first instant at which the pulse
amplitude reaches 10 % of the peak pulse amplitude and the first instant at which the
pulse amplitude reaches 90 % of the peak pulse amplitude, excluding any unwanted or
irrelevant po
rtion of the waveform.
d) pulse fall time, tf:
The interval between the last instant at which the pulse
amplitude reaches 90 % of the peak pulse amplitude and the next instant at which the
pulse amplitude reaches 10 % of the peak pulse amplitude, excluding any unwanted or
irrelevant po rtion of the waveform.
NOTE — Where the value of the droop approaches 10 % of the peak pulse amplitude, the upper point
defining fall time may be replaced by the last instant at which the pulse amplitude reaches 80 % of the
peak pulse amplitude.
e) droop:
The difference between the peak pulse amplitude and the amplitude of the
extrapolated smooth curve through the top of the pulse, excluding any initial "spike" or
"overshoot", at its intersection with the straight line through the points defining the
pulse fall time, expressed as a percentage of the peak pulse amplitude.
f) pulse crest:
The maximum amplitude of the pulse.
g) overshoot:
The amount by which the pulse crest exceeds the peak pulse
amplitude. Overshoot is expressed as a percentage of the peak pulse amplitude.
h) backswing: The maximum amplitude of the reverse pulse, i.e. the po
rtion of the
pulse after the zero-crossing, expressed as a percentage of the peak pulse amplitude.
i) return
backswing: The maximum amplitude of the swing that follows the back-
swing, expressed as a percentage of the peak pulse amplitude.
j)
recovery time: Th
...