1、BRITISH STANDARD BS EN 61305-2:1998 IEC 61305-2: 1997 Household high-fidelity audio equipment and systems Methods of measuring and specifying the performance Part 2: FM radio tuners The European Standard EN 61305-2:1998 has the status of a British Standard ICS 33.160.20BSEN 61305-2:1998 This British
2、 Standard, having been prepared under the directionof the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comes intoeffect on 15 May 1998 BSI 04-1999 ISBN 0 580 29292 4 Amendments issued since publication Amd. No. Date CommentsBSEN 61305-2:1998 BSI 04-1999
3、i Contents Page National foreword ii Foreword 2 Text of EN 61305-2 3BSEN 61305-2:1998 ii BSI 04-1999 National foreword This British Standard is the English language verison of EN 61305-2:1998. It is identical with IEC 61305-2:1997. The UK participation in its preparation was entrusted by Technical C
4、ommittee EPL/100, Audio, video and multimedia systems and equipment, to Subcommittee EPL/100/3, Equipment and systems in the field of audio, video and audiovisual engineering, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European com
5、mittee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. IEC 61305 comprise the following Parts: Part 1: General; Part 2: FM radio tuners; Part 3: Amplifiers. A list
6、 of organizations represented on this committee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one number
7、ing system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The
8、 British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A B
9、ritish Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a f
10、ront cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 8 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.EUROPEAN STANDARD NORME EUROPENNE E
11、UROPISCHE NORM EN 61305-2 February 1998 ICS 33.160.20 English version Household high-fidelity audio equipment and systems Methods of measuring and specifying the performance Part 2: FM radio tuners (IEC 61305-2:1997) Equipements et systmes audio grand public haute fidlit Mthodes pour mesurer et spci
12、fier les performances Partie 2: Rcepteurs radio FM (CEI 61305-2:1997) Hi-Fi-Gerte und Anlagen fr den Heimgebrauch Verfahren zur Messung und Angabe der Leistungskennwerte Teil 2: FM-Rundfunk-Empfangsteile (IEC 61305-2:1997) This European Standard was approved by CENELEC on 1998-01-01. CENELEC members
13、 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
14、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
15、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, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CE
16、NELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1998 CENELEC All rights of exploitation in any form and by any means reserved worldw
17、ide for CENELEC members. Ref. No. EN 61305-2:1998 EEN 61305-2:1998 BSI 04-1999 2 Foreword The text of document 100C/140/FDIS, future edition1 of IEC 61305-2, prepared by SC 100C, Audio, video and multimedia subsystems and equipment, of IECTC100, Audio, video and multimedia systems and equipment, was
18、 submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61305-2 on1998-01-01. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Annex ZA has been added by CENELEC. Endorsement notice The
19、 text of the International Standard IEC 61305-2:1997 was approved by CENELEC as a European Standard without any modification. Contents Page Foreword 2 1 General 3 1.1 Scope 3 1.2 Normative references 3 1.3 Conditions for measurement 3 1.3.1 Electrical conditions 3 1.3.2 Climatic conditions 3 1.4 Ref
20、erence audio-frequency output level 3 2 Methods of measurement 4 3 Contents of specifications 6 Annex ZA Normative reference to international publications with their corresponding European publications 8 Table 1 Pre-emphasis characteristics 7 latest date by which the EN has to be implemented at nati
21、onal level by publication of an identical national standard or by endorsement (dop) 1998-10-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1998-10-01EN 61305-2:1998 BSI 04-1999 3 1 General 1.1 Scope This part of IEC 61305 applies to household high-f
22、idelity radio tuner units with facilities for reception of frequency modulation sound broadcasts with a rated maximum system deviation of 75 kHz, using the pilot-tone system for stereophonic broadcasting (see ITU-R BS 450-2). It may be applied to systems using a rated maximum system deviation of 50
23、kHz by decreasing all the stated deviations in proportion. It also applies, except where stated, to equipment having multiple functions, including these facilities. It is intended to be read in conjunction with part 1 of this standard. 1.2 Normative references The following normative documents conta
24、in provisions which, through reference in this text, constitute provisions of this part of IEC61305. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC61305 are encouraged to investigate
25、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 60315-1:1988, Methods of measurement on radio receivers for various classes of emission Part 1: General considera
26、tions and methods of measurement, including audio-frequency measurements. IEC 60315-4:, Methods of measurement on radio receivers for various classes of emission Part 4: Receivers for frequency-modulated sound broadcasting emissions 1) . ITU-R BS 412-7:1995, Planning standards for FM sound broadcast
27、ing at VHF. ITU-R BS 450-2:1995, Transmission standards for FM sound broadcasting at VHF. ITU-R BS 641:1986, Determination of radio-frequency protection ratios for frequency modulated sound broadcasting. ITU-R BS 704:1990, Characteristics of FM sound broadcasting reference receivers for planning pur
28、poses. 1.3 Conditions for measurement 1.3.1 Electrical conditions Except where stated, the electrical conditions shall be those specified in IEC60315-1 and IEC60315-4, and measurements shall be made at a radio-frequency input level of 70dB (fW), equivalent to an e.m.f. source of 1,7mV in a 757 syste
29、m. Measurements of output shall be made at the main output terminals of the equipment, and the terminals used shall be stated with the results. If an output level control is provided (other than as a factory preset), it shall be set at a fixed position, stated with the results, within the range of s
30、ettings to be expected in use. 1.3.2 Climatic conditions See 2.2 of part 1. 1.4 Reference audio-frequency output level Except where stated, the 0 dB reference level for all a.f. output voltage measurements expressed in decibels shall be the a.f. output voltage produced by an r.f. input signal level
31、of 70dB (fW), modulated at 1kHz with 67,5kHz deviation; for a stereo signal the channels are modulated in phase. 1) To be published.EN 61305-2:1998 4 BSI 04-1999 2 Methods of measurement CHARACTERISTIC TO BE SPECIFIED METHOD OF MEASUREMENT 2.1 Noise-limited sensitivity at 50 dB signal-to-noise ratio
32、, expressed as the input signal level in dB (fW). According to 2.3 of IEC 60315-4, using the wide-band filter specified there and a true r.m.s. meter, with receiver in stereo mode. 2.2 Effective frequency range expressed as the range over which the response does not vary by more than 1,5 dB from the
33、 level at 1 kHz (see 1.4). According to IEC 60315-4, 5.8. 2.3 Interchannel gain difference expressed as the maximum difference in level of the right channel output with respect to that of the left channel output, in decibels, over the frequency range 250 Hz to 6,3 kHz. According to 5.4 of IEC 60315-
34、4, using the fixed position of the output level control (see 1.3.1). 2.4 Total harmonic distortion According to 5.2 of IEC 60315-4, with an r.f. input signal level of 70 dB(fW), a modulation frequency of 1 kHz and a deviation of 67,5 kHz, except where otherwise stated. The equipment shall be in the
35、stereo mode. The published specification shall be valid under all of the conditions: at any supply voltage within 10 % of the rated voltage; at any deviation between 6,75 kHz and 67,5 kHz; at any r.f. input signal level between 90 dB (fW) and the level determined according to 2.1 above; at a modulat
36、ion frequency of 5 kHz and 6,75 kHz deviation; at a modulation frequency of 40 Hz and 67,5 kHz deviation. NOTETo ensure that distortion measurements are not invalidated by noise, at each stage the output obtained with an unmodulated carrier should be noted. Measurements of distortion components are
37、valid only if at least 10 dB higher than the noise level. 2.5 Overall difference-frequency distortion, expressed as the output level of the 1kHz (3rd order) distortion product relative to the output voltage produced by 1 kHz modulation at 75 kHz deviation. According to 5.3.2 a) of IEC 60315-4, but u
38、sing modulation frequencies of 14 kHz and 15 kHz at 37,5 kHz deviation. The equipment shall be in the mono mode. 2.6 Intermodulation due to ultrasonic components expressed as the output level of the 1 kHz product (see1.4). According to 5.3.2c) of IEC 60315-4, using a modulation frequency of 10 kHz a
39、t 40 kHz deviation only. 2.7 Channel separation of each channel from the other, expressed in decibels referred to the output level produced by modulation at the relevant frequency. According to 5.7.2 of IEC 60315-4. Measurements shall be made at the frequencies 250 Hz, 1 kHz, 6,3 kHz and12,5 kHz. In
40、 order to allow the use of automatic measuring equipment, the deviation shall be set at each frequency in in accordance with the appropriate 50 4s or75 4s pre-emphasis characteristic (seeTable 1). 2.8 Unweighted (band-limited) signal-to-noise ratio, expressed in decibels as: 20 lg(U x /U z ) Accordi
41、ng to 2.2.1 a) of IEC 60315-4, using the band-pass filter specified therein and a true r.m.s. meter.EN 61305-2:1998 BSI 04-1999 5 where U x is the reference output voltage produced by 1 kHz modulation at 75 kHz deviation (mono) or 67,5 kHz deviation (stereo); U z is the noise output voltage. 2.9 A-w
42、eighted signal-to-noise ratio, expressed as in 2.8 . According to 2.2.1 b) of IEC 60315-4. 2.10 Capture ratio According to 3.1.2 of IEC 60315-4, but in mono mode, using a deviation of 75 kHz. 2.11 AM suppression According to 3.4.2.2 of IEC 60315-4 (sequential method). 2.12 Selectivity at low signal
43、level, expressed as the r.f. input signal level at X kHz (see below) off-tune required to give 20 dB signal-to-noise ratio, referencing the a.f. output due to a wanted signal input level of 70 dB (fW), when the wanted signal level is 30 dB (fW) (see 1.4). According to 3.2.2 of IEC 60315-4. The audio
44、 frequency output shall be measured using the band-pass filter described in1.4.1.3 of IEC 60315-4 and Figure 2a, and a true r.m.s. meter. The wanted signal level shall first be set at 70 dB (fW), with a modulation frequency of 1 kHz and a deviation of Y kHz (see below). For equipment intended for us
45、e in ITU Region 1, X is 300 kHz (three 100 kHz channels from the wanted channel) and Y is 40 kHz. For equipment intended for use in ITU Regions 2 and 3, X is 400 kHz (two 200 kHz channels from the wanted channel) and Y is 75 kHz. NOTEThe ITU regions are defined in the ITU Radio Regulations. Region 1
46、 includes Europe, Africa and areas bordering the Mediterranean Sea, Region 2 includes the Americas and Region 3 includes Asia and Australasia. However, broadcasting administrations in some countries may adopt systems which are not those generally used in that region. After tuning the equipment and n
47、oting the a.f. output voltage, the modulation shall be removed and the signal level set to 30dB (fW). The frequency difference between the wanted and unwanted signals shall be X kHz (see above) and the unwanted signal shall be modulated at 1kHz with Y kHz (see above) deviation. The level of the unwa
48、nted signal is then adjusted until the a.f. output level is20 dB below that first measured. NOTEAttention is drawn to ITU-R BS 412-7, BS 450-2, BS 641 and BS 704, accepted unanimously by the member administrations. Although the measurement conditions specified in this standard vary with ITU regions,
49、 Recommendations BS 412-7 and BS 704 strongly imply that the receiving equipment should have the same selectivity characteristics wherever it is intended to be used. 2.13 Single-signal i.f. rejection (see1.4) According to 3.3.2.2 of IEC 60315-4. 2.14 Single-signal image rejection (see1.4) According to 3.3.2.2 of IEC 60315-4. 2.15 Single-signal spurious rejection at the signal frequency plus half the intermediate frequency (see1.4). According to 3.3.2.2 of IEC 60315-4. 2.16 Spurious respons
