CELEX: 51978PC0766
Language: en
Date: 1979-01-22
Title: PROPOSAL FOR A COUNCIL DIRECTIVE AMENDING COUNCIL DIRECTIVE 71/316/EEC OF 26 JULY 1971 ON THE APPROXIMATION OF THE LAWS OF THE MEMBER STATES RELATING TO COMMON PROVISIONS FOR BOTH MEASURING INSTRUMENTS AND METHODS OF METROLOGICAL CONTROL (Submitted by the Commission to the Council)

ARCHIVES HISTORIQUES
DE LA COMMISSION
COLLECTION RELIEE DES
DOCUMENTS "COM"
COM (78) 766
Vol. 1978/0277
 ---pagebreak--- Disclaimer
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 ---pagebreak---         COMMISSION OF THE EUROPEAN COMMUNITIES
                                                                COM(78)766 final.
                                                                Brussels , 22 January 1979 .
                        PROPOSAL FOR A COUNCIL DIRECTIVE AMENDING
           COUNCIL DIRECTIVE 71/316/EEC OF 26 JULY 1971 ON THE APPROXIMATION
          OF THE LAWS OF THE MEMBER STATES RELATING TO COMMON PROVISIONS FOR
             BOTH MEASURING INSTRUMENTS AND METHODS OF METROLOGICAL CONTROL
                     ( Submitted by the Commission to the Council )
                                                        ' ~Z\
                                                  •X      ' -»/
                                            . . -.V           j
COM(78 ) 766 final .              , V'                   y/
                                  n. ■   ;i     \ C-Î-^
 ---pagebreak---                         EXPLANATORY MEMORANDUM
 Introduction
The measuring instruments industry is in full evolution because of the
development of electronics .
At present within the Community , the market in these instruments , is expan­
ding about 10 7. per year . In 1976 this market represented more than 400
million Units of Account . With reference to the field of weighing machines /
whose turnover is to the order of 250 million Units of Account in the EEC ,
electronic machines represent each year a growing percentage of the turn­
over, percentage  which is at present between 30 % and AO % . When one thinks
                                                               *
of the introduction of electronics . into the field of meters for liquids
( petrol pumps !) one can imagine the enormous onarket which is open to elec­
tronics in the field of measuring instruments . And yet the situation is
still blocked from the point of .view   of intra Community trade because of
diverging national laws ,   in particular in France and in Germany . For some
                                                                      ♦
time now the Community has turned its attention to the elimination of tech­
nical barriers in the metrological field . Since 1971 more than 25 directives
adopted for the elimination of technical barriers , relate to this sector .
However the instruments which have been affected to this date have always
been mechanical or electromechanical instruments which represented the
major part of the market , this will no longer be the case in the future .
In order to facilitate the Community industry in its natural evolution
towards electronics, in the face of its third country competitors , it was
necessary to allow it also to benefit from the advantages of a unified
internal market in this field .
 ---pagebreak---                                               - 2 -
II . Contents of the proposal                                                            _
       This Directive amending Council Directive 71 / 316/ EEC is adopted pursuant
       to Article 100 of the Treaty establishing the European Economic Community .
       The Council Directive 71 / 316 / EEC of 26 July 1971 on the approximation of
       the laws of the Member States relating to common provisions for both
                                                                      1
       measuring instruments and methods of metrological control        was adopted
       with a view to harmonizing the laws , regulations and administrative provisions
    ' which were in force at the time of each of the Member States and which
       were intended to lay down the procedures and methods of metrological
       control on their respective territories .
       The advantage of that Directive was therefore ,to establish appropriate
       EEC pattern approval and initial verification procedures and EEC methods
       of metrological control recognized by all the Member States which ,
       combined with the requirements of the separate directives , allow free
       movement of the instruments in question .      The instruments covered by the
       Community studies were mechanical or electromechanical .
       Since the adoption of this Council Directive 71 / 316 / EEC , considerable
        changes have occurred in the technology of these measuring instruments .
       When Directive 71 / 316 / EEC was drawn up , measuring instruments were mostly
       of the mechanical and electromechanical types .      Nowadays the situation
        is completely different :    the development , standardization and increasingly
        widespread use of electronic devices have completely revolutionized
       measuring techniques .
        Not all measuring instruments are affected by this innovation, but many
        are fitted with or associated with electronic devices .      By way of example ,
        mention may be made of weighing instruments in general , taximeters and
     t certain meters whose readout systems make use of these devices .         Others ,
        such as devices for measuring liquids other than water ( e.g. petrol pumps
     , used in service stations ) « lso rely on this modern technique .       '       >    ■
 ---pagebreak---                                       - 3 -
   Because of the use of electronic devices in measuring instruments , certain
  Member States have laid down technical requirements concerning these
  devices and these requirements have " created barriers to trade . in these
  measuring instruments .
  Conscious of this technical development and of the problems thus created ,-
  the Commission began a few years ago to study the various aspects of this
  question in collaboration with the competent national departments in each
  of the Member States and with the manufacturers and users of these
  instruments , associated in organizations belonging tc the Liaison Group for
 the European Industries ( ORGALIME ).   These include the Committee of
  Electrical and Electronic Measuring Instrument Industri.es of the EEC ( CIMEC ),
 the European Committee of Weighing Instrument Manufacturers ( CECIP ) and
 the European^Committee of Manufacturers of Equipment for the Metering ancf
 Distribution of Hydrocarbons ( CECOD );   the European Committee for Electro­
 technical Standardization ( CENELEC ) and the International Electrotecnni ca I
 Commission ( IEC ) have also been kept informed and, especially CENELEC ,
 associated with the studies ..
 A number of difficulties were encountered in preparing the proposal for a
 directive amending Council Directive 71 /316/ EEC .. These were due principally
 to the conflicting interests of the industrial sectors concerned, but
also to differences in the principles adopted by the Member States to
allow these measuring instruments equipped with electronic devices on
their national territories .
The preparatory discussions showed' that two equally prevalent schools of
thought in the Member States were acceptable as regards the design of
these devices . One advocated the incorporation of a number of checks along
the electronic chair, in order to detect and indicate significant defects,
the other that the aim should be to produce^ electronic devices with a
satisfactory standard of quality and reliability .
 ---pagebreak---                                       - 4 -
After numerous stadias and talks with the protagonists of these two
school s cf thc.icjht , tiie Commission has rin.a_l.ized the general requirements
for both systems which should thus provide reciprocally accepted
metrological security , With a 'few exceptions , the manufacturer remains
free to choose between these two methods according^ to circumstances . The
new proposal for amending the Directive adds an Annex III to the original
text and makes certain amendments to Annexes I and II to the old Directive .
This has two advantages : for mechanical and electrical appliances , the
Directive retains its intrinsic value with regard to EEC control ( EEC
pattern approval and EEC initial verification ) while at the same time it
is brought up to date by the addition of requirements specific to these
instruments fitted with electronic devices .
All of these new requirements , with which the national experts have
expressed a large degree of agreement , thus allow provision to be made in
the vertical directives for requirements peculiar to EEC pattern approval
and to the tests to be carried out on them .
This proposal for a directive , supplemented by separate directives , will
make possible the free movement of these new measuring instruments within
the Community .
CONSULTATION OF THE EUROPEAN PARLIAMENT AND THE ECONOMIC AND SOCIAL COMMITTEE
Pursuant to Article 100 , paragraph 2 , the opinion of these two bodies is
necessary , since implementation of the requirements laid down in the
proposal for a directive involves the amendment of legislation in some of
 the Member States .
As far as the procedure is concerned , the proposed amendments are necessary
 to adapt Directive 71/316EEC to technical innovations as explained above .
 It would therefore seem appropriate to use the special procedure laid down
 in Articles 17 to 19 of the Directive .
 However , since it considers the innovations to be of fundamental importance ,
 the Commission has decided to submit to the Council a proposal for an
 amendment under Article 100 .     This will enable the Council to discuss the
 problems in depth to lay down the principles for the adaptation of
 particular directives according to what is known as the procedure for
 adapting to technical progress .
 ---pagebreak---  PROPOSAL FOR A COUNCIL DIRECTIVE AMENDING DIRECTIVE 71/316/EEC
 OF 26 JULY. 1971 ON THE. APPROXIMATION OF THE LAWS OF THE MEMBER STATES
 RELATING TO COMMON PROVISIONS FOR BOTH MEASURING INSTRUMENTS AND METHODS
 OF METROLOGICAL CONTROL
                    ( submitted by the Commission to the Council )
                                                         *
                À
 THE COUNCIL OF THE EUROPEAN COMMUNITIES ,.
 Having regard to the Treaty establishing the European Economic Community ,
 and in particular Article 100 thereof ,
 Having regard to the proposal from the Commission ,
Having regard to the Opinion of the European Parliament ,
Having regard to the Opinion of the Economic and Social Committee ,
Whereas Council Directive 71/316/EEC of 26 July 1971 is intended to
achieve the free movement of these instruments within the Community by
harmonizing the differing national laws relating to metrological controls
and by establishing for this purpose appropriate EEC patterm approval and
initial verification procedures as well as EEC methods of metrological
control ;              "                                        '
Whereas, since the adoption of that Directive , progress in technology and
engineering has led to the development of methods of - construction based
on electronics which are today regularly used in the design , elaboration
and manufacture of measuring instruments ;
1 OJ No L202 6.9.1971 p.l
 ---pagebreak---                                         - 5 -
Whereas this technical progress could not be taken into account
at the time    Directive 71 / 316 / EEC was adopted ; whereas since then
Member States have embodied in their national laws requirements allowing
national approval to be granted to measuring instruments fitted with
electronic devices ;
Whereas it is consequently advisable , in order to extend the scope of the
above-mentioned Council Directive to measuring instruments equipped with
electronic devices and to harmonize the national laws adopted to this end ,
to amend and supplement the text of the European requirements at present
in force .
HAS ADOPTED.. THIS DIRECTIVE :
 ---pagebreak---                                       Arti ciel
  Articles 2(2 ) and ( 5 ), 5(3 ). and ( 4 ), 7(1 ) and ( 4 ), 8(1 ) and ( 2 ), 9 first
" paragraph, 15(2 ) and Cl7)of Directive 71/316/EEC are replaced by the
  following texts respectively:
  Article 2(2 )
  In so far as their control equipment permits , Member States shall , at thj
  request of the manufacturer or of his authorized representative , grant
  EEC pattern approval for every pattern of instrument and all ancillary
  equipment which satisfies the measurement characteristics and the                   ~
  technical design and functioning requirements laid down by this Directive
  where appropriate , and by the separate directive relating to the category
  of instrument in question .                                  *
  Article 2(5 )                                                         ,
  Member States shall grant EEC pattern approval in accordance with the
 provisions of this Directive and of the separate directives .
  Article 5(3 )                                                             .
  When new techniques which are not provided for in this Directive or in a
  separate directive are employed, limited EEC pattern approval may also be
 granted after prior "consultation with the other Member States . This
  limited approval may be subject to the restrictions mentioned in
 paragraph 2 and to special conditions connected with the technique used .
 This limited approval can, however ; be granted only :
 ~ if the separate directive for the relevant category of instruments has
    already entered into force;
    if the maximum permissible' errors specified in the separate directives
    are not exceeded .
 ---pagebreak---                                          - 7 -
   Such Limited approval shall be valid for not more than two years .       It may
   be extended for a further period of three years .
   Article 5(4 )
   If the Member State which granted limited EEC pattern approval as referred
   to in paragraph 3 considers that a new technique has proved satisfactory ,
   it shall apply for the adjustment to technical progress of the Annexes
   to this Directive , where appropriate , and of the Annexes to the relevant
   separate directive, in accordance with the provisions of Articles 18 and
■ 19 .    .  '
   Article 7(1 )
   The Member State which has granted EEC pattern approval may withdraw it :
   ( a ) if instruments for which this approval was granted do not conform to
       ' the approved pattern and / or to the provisions of this Directive , where
         appropriate , and of the relevant separate directive ;
   ( b ) if the metrological requirements specified in the certificate of
         approval or the provisions of Article 5(2 ) and ( 3) are not met .
   Article 7(4 )
   A Member State which discovers a case coming within the terms of para­
   graph 2 may suspend the placing on the market and putting into service of
   the instruments concerned.             *
   It shall immediately inform the other Member States and the Commission,
   stating the reasons on which its decision is based .
 ' The same procedure shall apply in the cases mentioned in paragraph 1 /
   with respect to instruments which have been exempted from EEC Initial
   verification, if the manufacturer , after due warning , does not bring the
   instruments into line with the approved pattern and/or with the provisions
   of this Directive, where appropriate, and of the relevant separate directive
 ---pagebreak---                                         - 8 -
Article 8(1 )
                             "i
The EEC initial verification constitutes the inspection of a new or
reconditioned instrument to confirm that it conforms to the approved
pattern and/or to the provisions of this' Directive , where appropriate ,
and of the relevant separate directive ;       it is certified by the EEC
initial verification mark .
Article 8(2 )                                                          '
If they have the requisite equipment , Member States shall carry out EEC
initial verification of instruments submitted as having the measurement
characteristics and satisfying the technical .construction and functioning
requirements laid down by this Directive , where appropriate and by the
separate directive on this category of instruments .
Article 9 , first paragraph
When an instrument is submitted for EEC initial verification , the Member
State carrying out the examination shall determine :
( a ) whether the instrument belongs to a category exempt from EEC pattern
       approval , and , if so , whether it satisfies the technical construction
       and functioning requirements laid down by this Directive , where
       appropriate , and by the separate directive on this category of
       instruments ;
 ( b ) whether the instrument has received an EEC- pattern approval and , if
       so , whether it conforms to the approved , pattern and to the provisions
       of this Directive , where appropriate , as well as to those of the
       relevant separate directive .
 Article 15(2 )
Notwithstanding the provisions of Article 1(1 ), an instrument in service
 which bears EEC signs or marks but does not satisfy the requirements of this
 Directive and / or of the relevant separate directive , in particular with
 regard to maximum permissible errors , may be banned from service in the same
 way as an instrument bearing national marks .
 ---pagebreak---                                         - 9 -
Article 17
The amendments necessary to keep :
- the Annexes to this Directive
- the Annexes to the separate directives dealing with the different
    categories of instruments , the legal units of measurement and EEC
    methods of metrological control ,
in line with technical progress shall be made in accordance with the
procedure laid down in Article 19 .
                                      Article II
The following texts are added to items 1.3 and 2.1 of Annex 1 to
Directive 71/316/EEC :
1 . 3.4 .
          In addition , in the case of an instrument equipped with electronic
          devi ces :
          - a list of its electronic components with their essential charac­
            teristics ,
          - a description of the electronic devices with drawings and diagrams
            explaining their construction and operation .
2.1.3 .
          Where appropriate , a detailed study of the electronic devices consis­
          ting principally of an examination of their design , proving tests
          of design and / or operation and an endurance test as provided for in
          item 8 of Annex III .
                                     Article III
 Item 1 of Annex II to Directive 71 / 316 / EEC - is replaced by the following
text :
 1 . General points
      1.1 - The EEC initial verification may be carried out in one or more
             stages ( usually two )-
 ---pagebreak---                                          10
1.2 . Subject to the provisions of the separate directives :
       1.2.1 . The EEC initial verification shall be carried out in one stage
                 on instruments which constitute a whole on leaving the' factory ,
                 that is to say instruments which , theoretically, can be
             • transferred to their place of installation without first having
                 to be dismantled .
       1-.2.2 .. The EEC initial verification shall be carried out in two or
                 more stages for instruments whose correct functioning depends
                 on the conditions in which they are installed or used .
      1.2.3 . The first stage of the verification procedure must ensure , in
                 particular , that the instrument conforms to the approved pattern
                 and/ or to the provisions of this Directive , where appropriate ,
                 and of the relevant separate directive , or , in the case of
                 instruments exempt from pattern approval , that they conform to
                 the relevant provisions .
la Examination for EEC initial verification
    For EEC initial verification, instruments equipped with electronic
    devices shall , in addition to meeting the requirement^ stipulated in
    Article 9 , undergo the examinations set out in item 9 of Annex III in
    order to ensure that the' electroni c devices conform to those incorporated
    in the approved pattern .
                                      Article- IV
 The Annex to this Directive , is added to Directive 71/316/EEC .
                                      Article V
( a) Member States shall adopt and publish by 31 December 1981 the laws ,
     regulations and administrative provisions which are needed in order to
     comply with this Directive and which shall enter into force on
     1 April 1982, and shall inform the Commission thereof .
 ---pagebreak---                                       - 11  -
( b ) Once this Directive has been notified , the Member States shall also
      ensure that the COP . mission is informed , in sufficient time for it to
      submit its comments , of any draft law , regulation or administrative
      provision which they propose to adopt in the field covered by this
      Di rective .
                                    Article VI
This Directive is addressed to the Member States .
                                               Done at Brussels
 ---pagebreak---                                       A_N_N_E_X
                                      ANNEX III
        REQUIREMENTS RELATING TO ELECTRONIC DEVICES INCORPORATED IN OR
                      ASSOCIATED WITH MEASURING INSTRUMENTS
                                      Chapter ■ I
  SiDêC|l_EQlQ|!
  This Annex specifies the general metro logical and technical charac­
  teristics which must be exhibited by electronic devices incorporated
  in or associated with measuring instruments or their ancillary
  equipment , together with the relevant examinations and tests .
  The separate directives relating to the different categories of
  measuring instruments supplement and clarify the general requirements .
  Aim                                    -  '         ;
  The object to be attained is to ensure that the electronic devices will
  function continuously and will in no case introduce significant errors
   into the measurement results .
                                                        \
   BÊlioi£iQQs_aQçj_t!Ç03iQglQgy              ;
   The fol Lowing terms which are defined in this Annex may be used in the
   separate directives in which they shall have the same meaning .
   3.1 . Electronic devices
          , 3.1.1 . Electroni c_deviçe
'     .             For the purposes of this Annex an electronic device is a
                    part of a measuring instrument or ancillary equipment
                    containing at least one electronic component and performing
                    a specific function in the instrument .
            3-1.2 . Electronic devjçe w|Íll_íiiii-.£!2ê£lSÍD2_£âEã21il£^
                    An electronic device shall be considered to have full
                    checking capability if every sub-assembly of the electronic
                    device having an essential function in . the measuring is
                    checked .
            3.1.3 . §i£Ctron2C_de\/2ce_WT_tl}_no_or_only_garti al_checking_ cag a bij-jty
                    Electronic devices without the full checking eapabi lity • as
                    specified in item 3.1.2 .
     3.2 . Primary and auxiliary indications -
            3.2.1 . Pr imary_indi cations
                    Any output data considered as authenti c^f or the purpose of leg
                    metrology .                                  „ -
 ---pagebreak---                                       - 13 -
                The primary indication may include not only the indication
                of the measured quantity , in display , printed or recorded
                form , but also a function of that quantity .
                The separate directive may specify which of the indications
                of a measuring instrument are to be regarded as primary
                indication .
       3.2.2 . Auxi I iar^_indi cations
                Any output data not regarded as primary indications .
3.3 . Repeatable and non-repeatable measurement
       3.3.1 . Repeatable measurement
               Measurement in which the determination of the measured quantity
                can normally be repeated .
       3.3.2 . Non-regeatable measurement
               Measurement in which only one determination of the measured
               quantity is possible .
3.-4 . Types of electronic devices
       3.4.1 .
               Device in which all the signals are continuous functions of
               the quantity being processed .
       3.4.2 .         I_dey2ce
               Device in which all the signals are discontinuous functions
               of the quantity being processed .
       3.4.3 . Μ2ϊ§^_^ενι ΰθ
               Indivisible device making use of both the preceding types of
               signals .
 . 5 . Types of - function
       3.5.1 . Statiç_function_(garallel )
                Function in which the output data depend only on the
               instantaneous value of the input data .
       3.5.2 . Klnetic_function_( serial )
               Function in which the output data depend not only on the
               current instantaneous values of the input data but also on
               the previous instantaneous values of the input data .
 ---pagebreak---                                       - 14 -
 3.6 . Faults
       3.6.1 . faults
               For the purpose of this Annex / a fault is a malfunction of
               the electronic device due to a failure of components or
               their connections , or to external disturbances .
       3.6.2 . £aults_accordi^g_to_duration
               3.6.2.1 . Jransi ent faults_
                           Faults the duration oi which may be less than that
                           of the shortest measuring operation involved .
               3.6.2.2 . Permanent f aults_
                           Faults which are not transient .
       3.6.3 . f aylts_accord2ng_to_thei r_seriousness
               3.6.3^1 . Insignificant faults_
                           Faults causing no errors or causing errors in the
                           measurement results which are smaller than the
                         . value laid down in the separate directive relating
                           to the instrument concerned .
               3.6.3.2 . Significant faults_
                           Faults not covered by item 3.6.3.1 .
3.7 . Types of checking
       3.7.1 . Permanent_automati c^checking ( P )
               Checking permitting the correct operation of electronic
               devices to be verified during a measurement either continuously
               or di scontinuously and preventing the inclusion of erroneous
               information , without the intervention of an operator .
       3.7.2 . lnterrr)2ttent _ automati c checking ( I )
               Checking permitting cyclic verification of the correct
               operation of electronic devices without the intervention of
               an operator .
       3.7.3 . Non2automatic_checking ( N )               ,
               Checking to permit verification of the correct operation of
               electronic devices and requiring the intervention of an
               operator .
3.8 . Hetrologi cal security
       The metrological security of a measuring instrument equipped with
       electronic devices is the ability of these devices to comply with
       the metrological and technical requirements to which they are
       subject .
 ---pagebreak---                                          15
                                   Chapter II
                   Requirements concerning electronic devices
4 . Q£Decai_ceguiçe||Dt|
    4.1 . Metrological security
          Measuring instruments and ancillary equipment fitted with electronic
          devices shall have the metrological security required for the use
          to which they are to be put .
          This security may be achieved by one of the following methods :
          - by means of a suitable design and type of construction which will -
             result in electronic devices which correspond to the requisite
             standard of quality and for which an adequate working life can be
             predicted by means of tests ,
          - by providing , for each sub-assembly of an electronic device with
             an essential function in the measurement , checking facilities
             which detect and indicate significant defects ,
          - by a combination of these methods .
          The choice of one of these methods is left to the manufacturer ,
          unless a separate, directive specifies otherwise'.
    4.2 . Emergency power supply
          If an emergency power supply is required by a separate directive ,
          switching over to the emergency power supply shall not cause faults
          in the electronic devices .
5 . Be9yÍrg!!DÍ!_£2D£!ÇDÍD9_fÍ!!írgDÍ!_dê¥Í£p_wi!h_íy!i_£heçkÍD3_£iQabilit2
    The design of devices with full checking capability shall be such that
    the functioning of the device is verified and that functional faults
    are detected automatically or by an operator and indicated .
    5.1 . Fault detection
          Faults are detected by means of checking facilities as specified in
          item 3.7 . The type of checking (P,I-,N ) depends on the types of
          electronic devices in which these checking facilities are
          incorporated .                                                 -
                                              ' 4
          Automatic checking facilities are required in the following
        / instances, unless a separate directive specifies otherwise :
          - digital kinetic function ( digital / serial ) devices shall be
             equipped with a permanent automatic checking system CP ).
 ---pagebreak---                                        - 16 -
             However / if the aforementioned checking system is fitted to only
             one part of the digital kinetic function device , but enables
             transient faults in the whole of this device to be detected , the
             other parts need only be fitted with an intermittent automatic
             checking system ( I ).
          - digital static function ( digital / parallel ) devices shall be
             equipped with a permanent automatic checking system ( P ) or an
             intermittent automatic checking system ( I ).
          The frequency of the intermittent automatic checks shall be laid
          down by the separate directive .
          Non-automatic checks-(N ) shall be used only where provided for by
          the separate directives .
          However , certain faults need not be detected :
         - faults arising from two or more simultaneous failures resulting
            from independent causes ,       .  ,
         - faults which make it impossible to perform any measurement ,
         - faults involving measuring errors so serious that they are bound
\           to be noticed by all those interested in the result of the
            measurement ,  -
         - faults which are specified in the separate directives .
   5.2 . Indication of a fault
         When a fault has been detected, action specified in the separate
         directive ( setting off an audible or visible alarm, stopping the
         measuring operation, switching off the indicating device , etc .)
         shall be taken automatical ly .
         This action shall be taken when : *
         - any fault is detected in digital devices ,
         ~ any fault resulting in a measurement error exceeding the value
            laid down by the separate directive is detected in analogue or
            mixed devices .
  5.3 . Manual test devices
         If a measuring instrument is fitted with electronic devices equipped
         with checking facilities, one or more manual test devices incorporated
         in the instrument shall allow the existence and operating condition
         of the checking facility to be verified .
  ii9yiÇiiiQli=£QD£§ÇDÍDg_|i|£ÍÇQDÍ£_d|VÍ£||=yÍ£hout_çhgçl< i ng.çaoabi i i t y o r -
  -====il===--------in9_Ç§B§bi l i ty                   -  - -              =   --
  The design and construction of electronic devices without checking
  capability or with partial checking capability shall be such as to give
  them a quality standard enabling them to function suffi cient ly continuously
    nd accurately under the nominal operating conditions of the measuring
  IssoJiatT ^               they aPe incorporated or with "hich they are
 ---pagebreak---                                 - 17 -
Furthermore , these electronic devices shall be protected against
external disturbances to which they may be exposed and which are likely
to cause significant faults .
Tests shall be carried out to assess the quality of these electronic
devices .
 ---pagebreak---                                                - 18
                                            Chapter III
         Examinations and tests of electronic devices for EEC pattern
                         approval and EEC initial- verification
7 . For EEC pattern approval and EEC initial verification of measuring
    instruments equipped with electronic devices , these devices shall undergo
    the examinations and / or the tests specified in this chapter .
8 . ÊXâQîiQa tlSD-1QC_ÊÊ£_E||£êÇQ=iBBÇ2yiI
    8.1 . Examination and testing of electronic devices with full checking
          capabi I ity
          8.1.1 . E x am in a t i on_o f_ t he_de s i gn
                   The examination of the design drawings is intended to verify
                   that electronic devices and their checking systems meet the
                   requirements of items 4 and 5 of this Annex .
                   This examination shall include :
                   ( a ) an assessment of the constructional features and
                          components used to ensure that the minimum required
                          quality is attained,
                   ( b ) consideration of any functional faults caused by
                          external influences or by failures due to the components
                          or their connections to ensure that in all instances the
                        . devices meet the requirements of item 5 ,
                   ( c ) verification of the existence and the correct functioning
                          of one or more manual test devices .
          8.1.2 . Exami nat i_on_of_ cor rect_funct2on2n2_§Qd_oge rat i on a I tests-
                  Electronic devices incorporated in the measuring instrument
                  shall be examined to ensure that th.ey have been constructed
                  with care and that the connections and joints have been
                  correctly made .
                   If an emergency power supply is required , a check shall be
                  made that the requirements of item 4.2 . have been met .
                  Operational tests shall then be carried out on the electronic
                  devices
                  instrument .
                                incorporated in the -fully operational measuring -
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                ( a ) Response_to influence factors
                      When the instrument is subjected to the influence
                      factors . specified in item 11.1 . of this Annex , the
                      electronic devices shall continue to function correctly
                      without giving rise to errors in the instrument in excess
                      of those permitted under the conditions specified by the
                      relevant separate directive .
             - ( b ) Response_to disturbances_
                      The instrument shall be subjected to the external
                      disturbances specified in item 11.2 . of this Annex and
                      supplemented , where appropriate , by the separate
                      directive , and also to simulated component and connection
                      failures .
                      Throughout these tests the electronic device shall
                       continue to operate normally or. else shall detect and
                       indicate any significant faults in accordance with the
                       requirements of item 5 .
      8.1.3 . Description of_the_gattern
                 Operation of the built-in manual test device or devices shall
                 show the existence and the correct functioning of the
                 checking system .
                 An endurance test shall then be carried out .     It shall
           " consist in submitting one or more instruments to a test
               - programme for a specified length of time or for a specified
                 number of operating cycles .
                 The length of the tests and the procedure for carrying them
             \ out shall be specified in the relevant separate directive .
                 On completion of these tests , the condition or the correct
                 functioning of the checking system shall be verified using
                 the . test device or .devices and an assessment shall be made
                 of whether the behaviour of the electronic devices during
                 these tests can be considered satisfactory for the use to
                 which these devices are to be put .
8.2 . Examination and testing of electronic devices without checking
      capability, or with partial checking, capability .
      8.2.1 . § xami^at2on_of_the_desijn_and_des22Q_i£St2n2
                 This study of the design of electronic devices is intended
                 to verify that the devices meet the requirements of items 4 ,
                 6 and 10 of this Annex .
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        8.2*1 .1 . Examination of_the_design
                   The examination includes :
                   ( a ) An appraisal of the characteristics of the
                              components, design and construction of the
                              electronic device to determine its reliability
                              and suitability for use in the measuring
                              instrument ,
                   ( b ) consideration of any functional faults caused
                              by failures due to components or connections to
                              ensure that these faults are not significant ,
                              or , if they are significant , that their frequency
                              is low enough to ensure compliance with the
                               required .level of reliability ,
                    ( c ) study of the measures taken by the manufacturer
                              to protect the electronic device from the
                    -          external influences specified in item 11.2 .
        8.2.1.2 . Design_proying_tests _
                    The design proving tests provided for in item 10
                    of this Annex shall be carried out on each non­
                    operational electronic device .
                    The correct functioning of the electronic devices
                    shall be verified before and after these tests .
8.2.2 . Examination_of_correct_functionin2_ar]d_ogerationaJ;_ test s
         Electronic devices incorporated in the measuring instrument
         shall be examined to ensure that they have been constructed
         with care and that the connections and joints have been
         correctly made .
         If an emergency power supply is required a check shall be
        made that the requirements of item 4.2 . have been met .            The
         operational tests provided for in items 11.1 . and 11.2 . of
        this Annex shall then be carried out on the electronic
        devices incorporated in the fully operational measuring
         instrument . When the instrument is . subjected to this test
        programme the electronic devices shall continue to function
         correctly so that the instrument retains the required
        metrologi cal qualities .
                                        ■        *
8.2.3 . Description of the pattern
        The pattern is characterized by the list of components used , -
         the manufacturing methods and an objective quality criterion .
        The quality is assessed by carrying out an endurance test
         which consists in submitting one or more instruments to a
         test programme for a specified length of time or for a
         specified number of operating cycles .              -
                                      *     ,  .                  •  *
                       -  ■ ■               ''             -        r
                        ν        ,
 ---pagebreak---                The length of and procedure for each test shall be specified
               in the relevant separate directive .
               Electronic devices shall continue to function correctly
               throughout the endurance test .
8.3 . Performance of the tests
       The operational tests provided for in items 8.1.2 . and 8.2.2 . may,
       depending on circumstances and in any case in compliance with the
       relevant separate directives, be combined with the endurance tests
       specified in items 8.1.3 . and 8.2.3 .
       All these tests shall result in a homogeneous programme , suited to
       the instrument concerned and applied uniformly by the competent
       services of the Member States .
       Furthermore , when provided for by the separate directives , these
       tests shall be carried out on sub-assemblies , fitted with electronic
       devices , which, can be made operational .
E^amioation_fgr_£|£_ÍDÍÍÍ|4=^iCÍÍÍ£i|iQQ
9.1 . Electronic devices with full checking capability
       The built-in manual test device or devices shall be operated on
       all the instruments submitted for initial verification in order to
       show that the checking systems are present and are functioning
       properly .
        For every n instrument submitted to the metrological service for .
       EEC initial verification, one instrument shall be taken for
       performance of the tests provided for in item 8.1.3 . or , depending
       on circumstances , the test programme drawn up pursuant to item 8.3.'
       The number n and the . consequences of unsati sfactory results in
        these tests shall be specified in the -separate directive .
 9.2 . Electronic devices with no or with partial checking capability
        For every m instrument submitted for EEC initial verification , one
        shall be taken for the purpose of : . ;
        - verifying that the main components used in the manufacture of the
           electronic devices are in an equivalent condition and are at
           least equal in quality to those contained in the list of component
           included in the EEC pattern approval file,
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- submitting the instrument to the tests provided for in
  item 8.2.3 . or to the test programme drawn up pursuant to
  item 8.3 .
The number m and the consequences of unsatisfactory results in the
abovementioned operations shall be specified in the separate
directive .
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                                 Chapter IV
             Tests to be carried out on electronic devices
Be|igQ_DÇQViDg_îë|t|
The design proving tests are intended to ensure the quality and
durability of electronic devices with no or with partial checking
capability .
These tests , to which each of these electronic devices must be
subjected , shall be carried out when the examination for EEC pattern
approval is made .           .
The operations carried out during this examination shall consist of :
- verifying the correct functioning of the instrument ,
- carrying out the tests listed in the following items ,
- refitting the electronic devices in the instrument and ,
- rechecking the correct functioning of the instrument by verifying
  in particular that the maximum permissible errors are still adhered
  to .
10.1 . Damp heat cycling test
         The electronic device shall be placed in a chamber whose temper­
         ature shall be stabilized at 25j+3°C and relative humidity at not
         less than 95% .
         Start the cycle by increasing the temperature to 40°C in
       ' 3h 30 min .; the relative humidity ( R.H. ) shall not be less
         than 95% except during the last 15 minutes when it shall not be
         less than 90% .
         Keep temperature at 40 +_ 2°C until 12h    30 min . from start of
         cycle ; R.H. 93 +_ 3% .
         Reduce temperature to 25 +_ 3°C in 3h +_ 30 min .; R.H. not less
         than 95% except during the first 15 minutes when it shall not be
         less than 90% . Keep temperature at 25 +_ 3°C with R.H. not less
         than 95% until the 24-hour cycle is completed .
         Six 24-hour cycles shall be completed .
                                            §
10.2 . Thermal shock test
         The electronic device shall be placed in a chamber at 5 + 3°C fo
         3h ; it shall be removed from the cold chamber and subjected to
         the - ambient temperature for not less than 2 minutes or more than
         3 minutes .
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       The electronic device shall be placed in a hot chamber at 40 _+ 2°C
       for 3h ; it shall be removed from the hot chamber and subjected
       to the ambient temperature for not less than 2 minutes or more
       than 3 minutes .
       Five cycles shall be completed .
10.3 . Mechanical shock test
       Equipment of a mass of less than 50 kg shall be allowed to fall
       freely from a height of 25 mm on to a steel plate not less than
       8 mm thick , fixed to a concrete base not less than 50 cm thick .
       The height of the drop shall be measured from the point of the
       equipment nearest to the steel plate prior to dropping .-
       The unit , supported in a rigid frame- by its normal support points ,
       shall be dropped six times on each of three mutually perpendicular
       faces .
       Equipment of over 50 kg shall be dropped on to a steel plate not
       less than 8 mm thick , fixed to a concrete base not less than
       50 cm thick . When the test is performed , one edge of the
       equipment shall remain in contact with this plate and its centre
       of gravity shall fall through 12 mm . Each base edge shall be­
       taken in turn , and the test shall be carried out six times .
10.4 . Vibration test
       The vibrations shall be applied successively along three axes
       perpendicular to each other and selected so that the weaknesses
       have every chance of being revealed .
                                I
       The test shall cover the frequency range from 10 to 150 Hz with
       slight sinusoidal excitation and a sweep rate not greater than
       1 octave / min . up and down .
       One of the following peak levels of acceleration shall be
       selected , depending on the environmental conditions of use , unless
       otherwise specified in the separate directives :
                    2
           5   m/ s     for a normal environment
           „   , 2    ,
          10 m / s for an industrial enviro'nment
       This test shall last for two hours .
10.5 . Additional tests                                        -
       The additional tests required for a measuring instrument designed
       for a special purpose shall be specified in the separate directives .
QgeEitigoiI_tes£
All the electronic devices incorporated in a measuring instrument shall
 be subjected to operational tests under one or more of the test conditions
 specified in this section, unless otherwise specified in the separate *
 directive . The tests shall be carried out , at the time of the examination
 for EEC pattern approval , on fully operational instruments .
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11.1 . Influence factors
      . When the instrument is subjected to the effect of the influence
        factors , the electronic devices must continue to function
        correctly without giving rise to errors in the instrument in
        excess of the maximum errors provided for under these conditions
        by the relevant separate directive .
        11.1.1 . Temperature
                 These tests shall be performed at a sufficient number of
                 stable temperatures to cover the temperature ranges
                 specified by the separate directive .
                 The ambient temperature is considered stable if the
                 following two conditions are satisfied :
                 ~ the difference between the extreme temperatures recorded
                   during a test does not exceed 5°C ;
                 - the temperature variation does not exceed 1°C in
                   five minutes .                 .       .
        11.1.2 . Relatiye_humidity
                 These tests shall be performed at least at the two ends
                 of the range specified below :
                 - from 20% to 80% if the electronic device is incorporated
                   in a part of the instrument intended for indoor use, or,
                 - from 5% to 95% if the electronic device is incorporated
                   in a part of the instrument intended for outdoor use .
        11.1.3.      at2on_in_the_gower_sugg ly
                 These tests shall be performed at the nominal voltage and
                 frequency and at the limits of variation specified by the
                 separate directive .
        11.1.4 . Other_inf_luence_ factors
                 Other tests bringing into play influence factors such as
                 vibration, harmonic distortions in the power supply, etc .,
                 shall be laid down in the separate directives relating to
                 measuring instruments for which the factors shall be
                 specified .
11.2 . External disturbances
        Unless  otherwise specified in a separate directive, the following
        tests shall be carried out ;
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        11.2.1 . Power sugply
                 11 . 2.1 .1 .. Interruptions or_reduct ions
                                100% voltage reduction for approximately
                                10 milliseconds .
                                50% voltage reduction for approximately
                                20 milliseconds .
                                20% voltage reduction for approximately
                                50 mi I liseconds .
                                The time interval between two consecutive tests
                                must be at least 10 seconds .
                 11.2.1.2 . Mains - Borne interference              .   '   v ■
                                Randomly phased transient    overvoltages of either
                                polarity shall be applied    to the system .
                                These transients shall be    supplied in common-
                                mode and series-mode from    an impedance of 5 Owfi.-
                                The amplitude, risetime , duration and repetition
                                rate shall be as specified in the following
                                table : '
 Amplitude             Riseti me            Ha lf -amplitude       Repetition
                                                duration                rate
   500 ν                 2 ns                     100 ns                10 Hz      n
 1 500 V                25 ns                        1 LIS            412 Hz
   300 V               Burst of puises lasting for about
                       1 ms of about 1. MHz
                                                                      « 12 Hz
                                                   •
    5%
of the nominal         sine wave superimposed on the mains        30 kHz - 150 kHz
value
  1–1 V––              sine wave superimposed on the mains 150 kHz - 400 MHz
        11.2.2 . External_interf erences
                 11.2.2.1 . Mains-borne interférence
                                Mains-borne interference over power lines is
                                specified in item 11.2.1.2 .
                 11.2.2.2 . Radiated interference
                                - Induction field
                                  Induction field of 60 A /m and 50 Hz obtained
                                  for example by a cable carrying 10 Amps at a
                                  distance of about 2.5 cm .
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                    - Electromagnetic radiation
                       Field strength of 10V / m at frequencies of
                       100 kHz - 500 MHz
                       Field strength of 1 V / m at frequencies of
                      500 MHz - 1 000 MHz .
         11.2.2.3 . Electrostatic discharge '
                    Electrostatic discharge of 6 kV with energy of
                    2 mJ on earthed chassis with a minimum of
         ...        10 s between individual discharges .
11.2.3 . Other external disturbances
         Other tests involving disturbances such as power supply
         failure , interference by the low voltage network , etc .,
         shall be specified in the separate directives relating to
         measuring instruments likely to be affected by these
         disturbances .