SIST EN 61811-50:2003

SLOVENSKI SIST EN 61811-50:2003

STANDARD
april 2003
Electromechanical all-or-nothing relays - Part 50: Sectional specification -
Electromechanical all-or-nothing telecom relays of assessed quality
ICS 29.120.70 Referenčna številka
SIST EN 61811-50:2003(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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EUROPEAN STANDARD EN 61811-50
NORME EUROPÉENNE
EUROPÄISCHE NORM May 2002
ICS 29.120.70 Supersedes EN 116500:1992
English version
Electromechanical all-or-nothing relays
Part 50: Sectional specification -
Electromechanical all-or-nothing telecom relays
of assessed quality
(IEC 61811-50:2002)
Relais électromécaniques de tout-ou-rien Elektromechanische Schaltrelais
Partie 50: Spécification intermédiaire - Teil 50: Rahmenspezifikation -
Relais électromécaniques de tout-ou-rien Elektromechanische Telekom-Relais
télécom soumis au régime d'assurance mit bewerteter Qualität
de la qualité (IEC 61811-50:2002)
(CEI 61811-50:2002)
This European Standard was approved by CENELEC on 2002-05-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,
Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61811-50:2002 E

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EN 61811-50:2002 - 2 -
Foreword
The text of document 94/144/FDIS, future edition 2 of IEC 61811-50, prepared by IEC TC 94,
All-or-nothing electrical relays, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 61811-50 on 2002-05-01.
This European Standard supersedes EN 116500:1992.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2003-02-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2005-05-01
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annex ZA is normative and annex A is informative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61811-50:2002 was approved by CENELEC as a European
Standard without any modification.
__________

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- 3 - EN 61811-50:2002
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 60062 1992 Marking codes for resistors and EN 60062 1993
capacitors + A11 2001
IEC 60255-23 1994 Electrical relays EN 60255-23 1996
Part 23: Contact performance
IEC 60410 1973 Sampling plans and procedures for--
inspection by attributes
IEC 60695-2-2 1991 Fire hazard testing EN 60695-2-2 1994
Part 2: Test methods -
Section 2: Needle-flame test
IEC 61709 1996 Electronic components - Reliability - EN 61709 1998
Reference conditions for failure rates
and stress models for conversion
IEC 61810-1 1998 Electromechanical non-specified time EN 61810-1 1998
all-or-nothing relays
Part 1: General requirements
IEC 61810-5 1998 Part 5: Insulation coordination EN 61810-5 1998
IEC 61810-7 1997 Part 7: Test and measurement --
procedures
IEC 61811-1 1999 Electromechanical non-specified time EN 61811-1 1999
all-or-nothing relays of assessed quality
Part 1: Generic specification
IEC QC 001002-3 1998 IEC Quality Assessment System for--
Electronic Components (IECQ) -
Rules of Procedure
Part 3: Approval procedures
ISO 8601 2000 Data elements and interchange --
formats - Information interchange -
Representation of dates and times
ISO 9001 2000 Quality management systems EN ISO 9001 2000
Requirements

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EN 61811-50:2002 - 4 -
Publication Year Title EN/HD Year
CECC 00 016 1990 Basic Specification: Basic requirements--
for the use of statistical process control
(SPC) in the CECC system
CECC 00 800 1986 Code of practice on the use of the ppm--
approach in association with the CECC
system

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INTERNATIONAL IEC
STANDARD
61811-50
QC 160500
Second edition
2002-03
Electromechanical all-or-nothing relays –
Part 50:
Sectional specification –
Electromechanical all-or-nothing telecom
relays of assessed quality
Relais électromécaniques de tout-ou-rien –
Partie 50:
Spécification intermédiaire –
Relais électromécaniques de tout-ou-rien télécom
soumis au régime d'assurance de la qualité
 IEC 2002  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch  Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
S
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

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– 2 – 61811-50  IEC:2002(E)
CONTENTS
FOREWORD.4
1 General .5
1.1 Scope.5
1.2 Normative references .5
1.3 Terms and definitions .6
1.4 Preferred values.7
1.5 Marking and documentation.8
2 Quality assessment procedures.9
2.1 Primary stage of manufacture.9
2.2 Structurally similar relays .9
2.3 Subcontracting .9
2.4 Qualification approval procedures .9
2.5 Quality conformance inspection.9
2.6 Test schedule.10
2.7 Order of tests .10
3 Preparation of blank detail and detail specifications.10
4 Test schedule.12
4.1 Test sequence.12
4.2 Types of relays, based upon environmental protection (relay technology RT) .12
4.3 Categories of application of contacts .12
4.4 Notes relative to Table 1 .12
5 Relay reliability - Failure rate data .13
Annex A (informative) Data base for failure rates.18

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61811-50 © IEC:2002(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROMECHANICAL ALL-OR-NOTHING RELAYS –
Part 50: Sectional specification –
Electromechanical all-or-nothing telecom relays
of assessed quality
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 specifications, 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 61811-50 has been prepared by IEC technical committee 94:
All-or-nothing electrical relays.
This second edition of IEC 61811-50 cancels and replaces the first edition published in 1997
and constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
94/144/FDIS 94/158/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 IEC Quality Assessment System for Electronic Components (IECQ).
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.

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– 4 – 61811-50  IEC:2002(E)
The committee has decided that the contents of this publication will remain unchanged until
2007. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.

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61811-50 © IEC:2002(E) – 5 –
ELECTROMECHANICAL ALL-OR-NOTHING RELAYS –
Part 50: Sectional specification –
Electromechanical all-or-nothing telecom relays
of assessed quality
1 General
1.1 Scope
This part of IEC 61811 is a sectional specification and applies to electromechanical all-or-
nothing telecom relays of assessed quality. Relays according to this standard are provided for
operation in telecommunication applications. However, as electromechanical all-or-nothing
relays, they are also suitable for particular industrial and other applications.
This standard selects from IEC 61810-7 and other sources the appropriate methods of test to
be used in detail specifications derived from this specification, and contains basic test
schedules to be used in the preparation of such specifications. Detailed test schedules are
contained in the blank detail specifications supplementary to this specification.
1.2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60062:1992, Marking codes for resistors and capacitors
IEC 60255-23:1994, Electrical relays – Part 23: Contact performance
IEC 60410:1973, Sampling plans and procedures for inspection by attributes
IEC 60695-2-2:1991, Fire hazard testing – Part 2: Test methods – Section 2: Needle-flame test
IEC 61709:1996, Electronic components – Reliability – Reference conditions for failure rates
and stress models for conversion
IEC 61810-1:1998, Electromechanical non-specified time all-or-nothing relays – Part 1:
General requirements
IEC 61810-5:1998, Electromechanical non-specified time all-or-nothing relays – Part 5:
Insulation co-ordination
IEC 61810-7:1997, Electromechanical all-or-nothing relays – Part 7: Test and measurement
procedures

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– 6 – 61811-50  IEC:2002(E)
IEC 61811-1:1999, Electromechanical non-specified time all-or-nothing relays of assessed
quality – Part 1: Generic specification
QC 001002-3:1998, Rules of Procedure of the IEC Quality Assessment System for Electronic
Components (IECQ) – Part 3: Approval Procedures
ISO 8601:2000, Data elements and interchange formats – Information interchange –
Representation of dates and times
ISO 9001:2000, Quality systems – Model for quality assurance in design, development,
production, installation and servicing
CECC 00016:1990, Basic requirements for the use of statistical process control (SPC) in the
CECC system
CECC 00800:1986, Code of practice on the use of the ppm approach in association with
the CECC system
1.3 Terms and definitions
For the purpose of this part of IEC 61811, the terms and definitions given in IEC 61810-7, as
well as the following apply:
1.3.1
types of relays
types of relays as defined in IEC 61810-7
NOTE The most frequent types of electromechanical all-or-nothing telecom relays are the following ones:
– monostable: non-polarized;
– monostable: polarized;
– bistable: polarized.
1.3.2
types of contacts
a) change-over break-before-make contact
change-over contact, one contact circuit of which breaks before the other makes
b) change-over make-before-break contact
change-over contact, one contact circuit of which makes before the other breaks
1.3.3
contact fault and contact failure
a) contact fault due to contact-circuit resistance
the occurrence is assumed when the contact-circuit resistance of a closed contact exceeds
the maximum value stated in the detail specification
b) contact fault due to non-opening of the contact circuit (e.g. contact sticking)
the occurrence due to the fact that the contact does not open is assumed when the resistance
of an open contact assembly falls below the specified minimum value stated in the detail
specification
c) contact failure
the occurrence is assumed when the number of faults due to contact-circuit resistance or/and
of faults due to non-opening of the contact circuit exceeds the number of faults stated in the
detail specification, with reference to a single tested contact

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61811-50 © IEC:2002(E) – 7 –
1.3.4
relay fault, relay failure and relay defect
a) relay fault
the state of a relay characterized by the inability to perform a required function. A fault
persists for a limited time after which the relay recovers the ability to perform a required
function without being subjected to any corrective maintenance
b) relay failure
failure occurs when the relay is unable to carry out its required function
c) relay defect
any deviation of a characteristic of a relay from the requirements
NOTE 1 The requirements may or may not be expressed in the form of a specification.
NOTE 2 A defect may or may not affect the ability of a relay to perform a required function.
d) defective relay
relay containing one or more defects
1.4 Preferred values
The following Subclauses contain preferred values applicable to electromechanical all-or-
nothing telecom relays.
1.4.1 Rated coil voltages
Preferred values d.c.: 1,5; 3; 4,5; 5; 6; 9; 12; 24; 48 or 60 V.
1.4.2 Contact-circuit resistance
a) Preferred values in initial condition: maximum 50; 100 or 200 mΩ.
b) Preferred values during/after tests: maximum 0,5; 1; 5; 10; 20 or 100 Ω.
c) Preferred value for detecting faults due to non-opening of the contact circuit during tests:
minimum 100 kΩ.
d) Voltage for detecting faults due to non-opening of the contact circuit during tests;
preferred maximum values: 0,03; 5; 6; 12; 24; 48 or 60 V d.c.
e) Difference of contact-circuit resistance between different contact circuits in the same
relay, preferred value: maximum 100 mΩ (initial condition).
1.4.3 Dielectric test
Preferred values in initial condition between opened contact circuits, between separate
contact circuits, between contact circuits and coil(s), between all conductive parts and mass
(if applicable) in accordance with IEC 61810-5.
a) Preferred voltages: 0,5; 0,8; 1,5; 2,5 kV a.c.
b) Preferred duration: 1 s or 60 s
1.4.4 Impulse voltage test
a) Preferred voltages: 0,5; 1,0; 1,5; 2 or 2,5 kV.
b) Preferred waveform: 0,5 μs/700 μs, 1,2 μs/50 μs or 10 μs/700 μs.
c) Preferred number of pulses (alternate positive and negative pulses): 10.
d) Preferred frequency of pulses: 2 or 4 pulses/min.

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– 8 – 61811-50  IEC:2002(E)
1.4.5 Insulation resistance
Preferred value: 1 000 MΩ at 500 V d.c. initial value.
1.4.6 Number of operations determining electrical endurance
Preferred values: 10 000; 20 000; 50 000; 100 000; 200 000; 500 000; 700 000; 1 000 000;
1 600 000; 2 000 000; 5 000 000; 10 000 000; 20 000 000 or 30 000 000.
1.4.7 Contact failure rate for test evaluation purposes
–5 –6 –7 –8
Preferred values: maximum 10 , 10 , 10 , 10 /contact/cycle.
1.5 Marking and documentation
Relays and their package supplied in accordance with detail specifications covered by this
sectional specification shall be marked as follows:
1.5.1 Marking of the relay
a) Manufacturer's name, logo or trade mark.
b) Relay type and variant code.
c) Coded date of manufacture, in terms of year/week according to 1.5.3.
d) IECQ in letters or IECQ mark of conformity.
e) Identification of terminal No. 1.
1.5.2 Marking of the package
a) Manufacturer's name, logo or trade mark.
b) Relay type and variant code.
c) Manufacturer's batch identification code.
d) IECQ in letters or IECQ mark of conformity.
e) Detail specification reference if not marked on the relay.
f) Quantity.
1.5.3 Coded date of manufacture
The marking system shall use four figures as specified in 5.2 of IEC 60062. The first two
figures shall be the last two figures of the year and the last two figures the numbering of the
week (5.2.3.3 b) of ISO 8601, year and week in the current century, modified).
Example: Fifth week of 1994 = 9405.
If stated in the detail specification only, the basic format for a specific date in accordance with
5.2.1.3 a) of ISO 8601 shall be used. The first two figures shall be the last two figures of the
year, the month is represented by the next two figures and the day of the month is
represented by the last two figures.
Example: 20th June 1994 = 940620.

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61811-50 © IEC:2002(E) – 9 –
2 Quality assessment procedures
2.1 Primary stage of manufacture
The primary stage of manufacture is the first process subsequent to the manufacture of
finished parts and subassemblies of the relay.
NOTE 1 A subassembly is understood to mean here the permanent assembly of two or more piece parts.
NOTE 2 Important manufacturing steps are as follows:
a) fabrication, heat treatment and plating of the component parts of the relay;
b) coil winding;
c) assembling of the electrical and electromechanical parts;
d) adjustment of the relay contacts, if applicable;
e) high-temperature drying, gas backfilling and sealing of the relay, if applicable;
f) final measurements and periodic inspection of test groups A to C.
2.2 Structurally similar relays
Relays are considered structurally similar if they have no differences in design other than:
a) coil wire diameter and number of windings;
b) types, numbers and material of contacts;
c) rated coil and/or contact voltage(s);
d) mounting and terminal variants within the limits prescribed in the detail specification;
e) biasing of the input circuit parts.
2.3 Subcontracting
For subcontracting, see annex B to Clause 2 of QC 001002-3.
2.4 Qualification approval procedures
Qualification approval tests shall include all the tests prescribed in the detail specification and
shall be performed by a schedule specifically prescribed in the detail specification.
The number of specimens for each subgroup is specified in the blank detail specification. As a
general rule, a minimum of five specimens are required for each group of tests.
2.5 Quality conformance inspection
2.5.1 Formation of inspection lots
Inspection lots submitted to groups A and B acceptance tests shall be formed in accordance
with 3.2.3 of QC 001002-3 and with the sampling plans and procedures given in IEC 60410,
except where production is too infrequent or too small for sampling plans to apply; in these
cases inspection shall be 100 %.
When sampling is carried out in accordance with IEC 60410, the percent defective concept
only shall be used. Stratified or representative sampling shall always be used to include all
production lines and structurally similar relays in proportion to their respective quantities in
the lot. Exceptions from proportionality may become necessary and shall be stated in the
detail specification. Specimens shall be as representative as possible of the production.
The determination basis for the sample sizes from continuous production lines shall be stated
in the blank detail specification.

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– 10 – 61811-50  IEC:2002(E)
2.5.2 Periodic inspection
Fixed sample sizes for group C inspection shall be taken from a lot (or lots) which has (have)
passed groups A and B inspection during or at the end of the specified reference period.
2.6 Test schedule
2.6.1 Test sequence
A test sequence shall consist of all tests listed in the detail specification. Where appropriate,
the reference number of the tests are those of the IEC 61810-7. Additional testing may be
called for by the detail specification.
2.6.2 Groups A and B
The inspection level (IL) notation applies to all tests in one subgroup. A corresponding
value/range of values of the acceptable quality level (AQL) shall be given in the blank detail
specification, and the authority preparing detail specifications shall choose the appropriate
value, which then applies to all tests in one subgroup.
Any given IL-AQL notations shall be interpreted so that the number of defectives allowable for
acceptance is applicable separately to each test within a subgroup. However, the blank detail
specification may prescribe this same IL for relays submitted to cumulative tests of the same
subgroup.
2.6.3 Group C
The blank detail specification shall prescribe for each subgroup:
a) periodicity of each subgroup. If the same periodicity is applicable to all subgroups, it shall
be given at the beginning of the group test details;
b) the minimum sample size for each test (or group of tests) performed with the same relays
and the acceptable number of defectives.
2.7 Order of tests
Quality conformance inspection is divided into two parts: that carried out lot-by-lot, on which
the release of the individual lots is based, and that carried out on a periodic basis, which
contains the time-consuming and more expensive tests.
When several tests are subsequently to be carried out on any one specimen or number of
specimens, the following order shall apply, unless otherwise prescribed in the detail
specification:
a) a 100 % test with a screening or sorting function shall always precede any other non-
destructive (ND) or destructive (D) test;
b) tests in groups other than a 100 % test shall be performed in the sequence given in the
blank detail specification. It shall be ensured that the effects of earlier tests are not liable
to invalidate the results of the later tests (see 4.1).
3 Preparation of blank detail and detail specifications
3.1 Blank detail specifications shall conform to the test schedules given in Table 1 of this
specification and the related explanations.
3.2 Blank detail specifications shall give the following information or call for its inclusion in
the detail specification:

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61811-50 © IEC:2002(E) – 11 –
a) Identification of the detail specification.
b) Identification of the relay and information on its applications; identification shall be
provided by such properties as size, sealing, whether monostable or bistable, polarized or
not, or other characteristics required for identification, contact operating range and
temperature range.
c) Outline drawing of the relay and key dimensions; variants, such as for terminals, may be
given in an annex to the detail specification.
Customer packaging requirements for automatic handling.
d) Reference data of the relay.
1) A limited number of values is required on the front page to describe the overall
performance of the relay.
2) Full information in conformance with 1.4 and IEC 61810-1 shall be added on one of the
subsequent pages. Rated values preferably should be those listed therein. Where tests
refer to rated values, this shall be indicated with each test. Where tests are to be
performed at other than rated values, the test values shall be indicated and clearly
distinguished from the rated values.
e) Normative references.
Reference shall be made to IEC 61810-7 and this sectional specification. When reference
to further documents is necessary, such documents shall be listed with their full titles, year
of edition and, unless common knowledge, the source from which they can be obtained.
f) Assessment level.
Table 1 of this specification contains one test schedule. If additional tests not listed there
have been added, this shall be stated.
g) Periodicity of tests.
h) Formation of inspection lots, if predictable in the sense of 2.6.1.
i) Order of tests, if deviating from 2.7.
j) General test conditions, if deviating from 3.5 of IEC 61810-7.
k) Qualification approval test schedule.
l) Quality conformance test schedule.
For each group of tests, the final measurements and post-test requirements specified in
each of them may be summarized and stated at the end of the subgroup.
It shall be stated that samples subjected to destructive tests (D) shall not be released for
delivery.
NOTE If application of SPC or ppm approach is required, this should be provided between the manufacturer
and user of a relay in accordance with CECC 00800, CECC 00016 or ISO 9001.
m) Specification of IL numbers (groups A and B) and sample sizes (group C).
n) Specification of AQL numbers (groups A and B) and acceptable numbers of defectives
(group C).
o) Marking of package and/or relays beyond those listed in this specification, if necessary.
p) Ordering information.
3.3 Additional information such as curves and drawings may be given in an annex to the
detail specification. Such information is not required to be verified for test purposes.
3.4 When preparing blank detail or detail specifications, the following procedures should be
followed:
– select the tests to b
...