1、 BS EN BRITISH STANDARD Household high-fidelity audio equipment and systems - Methods of measuring and specifying the performance Part 2. FM radio tuners The European Standard EN 613052 : 1998 has the status of a British Standard ICs 33.160.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY
2、 COPYRIGHT LAW 61305-2 : 1998 EC 61305-2 1997 STD-BSI BS EN bL305-2-ENGL 1778 Lb24bb9 Ob78192 287 Amd. No. BS EN 61305-2 : 1998 Date Text affected This British Standard, having been prepared under the direction of the Electrotechnicai Sector Board, was published under the authority of the Standards
3、Board and comes into effect on 15 May 1998 National foreword This British Standard is the English language verison of EN 61305-2 : 1998. It is identical with IEC 613052 : 1997. The UK participation in its preparation was entrusted by Technical Committee EPL/lO, Audio, video and multimedia systems an
4、d equipment, to Subcommittee EPUlOB, 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 internationallEuropean committee any enquiries on the interpretation, or proposai
5、s 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 Amplifie= A list of organizations represented on this committee can be obta
6、ined on request to its secretaty. 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 numbering system to the other, publications may contain identifie
7、rs 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 intemationai publications with their corresponding European publications. The British Standards which implement intemational or European
8、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. Compliance with a British Standard does not of itself confer immunit
9、y from legal obligations. O BSI 1998 ISBN O 580 29292 4 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE 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 6130
10、5-2:1997) Equipements et systmes audio grand public haute fidlit - Mthodes pour mesurer et spcifier les performances Partie 2: Rcepteurs radio FM Hi-Fi-Gerte und -Anlagen fr den Heimgebrauch - Verfahren zur Messung und Angabe der Leistungskennwerte Teil 2: FM-Rundfunk-Empfangsteile (CE1 61 305-2: 19
11、97) (IEC 61 305-2: 1997) This European Standard was approved by CENELEC on 1998-01 -01. CENELEC members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date
12、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 th
13、e 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, Irela
14、nd, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 3
15、5, B - 1050 Brussels a 1998 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61305-2:1998 E - STD-BSI BS EN bL305-2-ENGL 1998 I Lb24667 Ob78194 05T I Page 2 EN 61305-2 : 1998 Foreword The text of document 1 OOC/140/FDIS, future edi
16、tion 1 of IEC 61 305-2, prepared by SC 1 OOC, Audio, video and multimedia subsystems and equipment, of IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61 305-2 on 1998-01-01. The following dates were fixe
17、d: - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement dop) 1998-1 0-01 - latest date by which the national standards conflicting with the EN have to be withdrawn (daw) 1 998-1 0-01 Annexes designated “normative“ ar
18、e part of the body of the standard. In this standard, annex ZA is normative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC 61 305-2:1997 was approved by CENELEC as a European Standard without any modification. - STD.BSI BS EN bL305-2-ENGL 1798 = lb
19、24bb9 Ob78145 Tb m Page 3 EN 61305-2 : 1998 CONTENTS Clause 1 General 1.1 Scope . 1.2 Normative references 1.3 Conditions for measurement . 1.3.1 Electrical conditions 1.3.2 Climatic conditions . 1.4 Reference audio-frequency output level . 2 Methods of measurement . . 3 Contents of specifications .
20、 Page 4 4 4 5 5 5 5 5 8 9 Table 1 - Pre-emphasis characteristics . Annex ZA - Normative reference to international publications with their corresponding European publications . . . , . . . . . . . . . . . . 1 O Q BSI 1998 Page 4 EN 61305-2 : 1998 HOUSEHOLD HIGH-FIDELITY AUDIO EQUIPMENT AND SYSTEMS -
21、 METHODS OF MEASURING AND SPECIFYING THE PERFORMANCE - Part 2: FM radio tuners 1 General 1.1 Scope This part of IEC 61305 applies to household high-fidelity radio tuner units with facilities for reception of frequency modulation sound broadcasts with a rated maximum system deviation of 175 kHz, usin
22、g 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 150 kHz by decreasing all the stated deviations in proportion. It also applies, except where stated, to equipment having multiple functions, including th
23、ese facilities. It is intended to be read in conjunction with part 1 of this standard. 1.2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 61305. At the time of publication, the editions indica
24、ted were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 61305 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and IS0 maintain registers of curre
25、ntly valid International Standards. IEC 6031 5-1 :1988, Methods of measurement on radio receivers for various classes of emission - Part 1: General considerations and methods of measurement, including audio-frequency measurements IEC 60315-4:, Methods of measurement on radio receivers for various cl
26、asses of emission - Part 4: Receivers for frequency-modulated sound broadcasting emissions 1) ITU-R BS.412-7:1995, Planning standards for FM sound broadcasting 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 pro
27、tection ratios for frequency modulated sound broadcasting ITU-R BS.704: 1990, Characteristics of FM sound broadcasting reference receivers for planning purposes 1) To be published. STD-BSI BS EN b1305-2-ENGL L99B = 1b24bb7 0678147 Bb m Page 5 EN 61305-2 : 1998 1.3 Conditions for measurement 1.3.1 El
28、ectrical conditions Except where stated, the electrical conditions shall be those specified in IEC 60315-1 and IEC 60315-4, and measurements shall be made at a radio-frequency input level of 70 dB (fW), equivalent to an e.m.f. source of 1,7 mV in a 75 f2 system. Measurements of output shall be made
29、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 settings to be expected in use. 1.3.2 Cli
30、matic conditions See 2.2 of part 1. 1.4 Reference audio-frequency output levei Except where stated, the O 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 of 70 dB (fW), modulated at 1 kHz with 1
31、67,5 kHz deviation; for a stereo signal the channels are modulated in phase. 2 Methods of measurement CHARACTERISTIC TO BE SPECIFIED 2.1 Noise-limited sensitivity at 50 dB signal- to-noise ratio, expressed as the input signal level in dB (fW). 2.2 Effective frequency range expressed as the range ove
32、r which the response does not vary by more than 11,5 dB from the level at 1 kHz (see 1.4). 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 kH
33、z. 2.4 Total harmonic distortion The published specification shall be valid under all of the conditions: at any supply voltage within 110 70 of the rated voltage; at any deviation between 16,75 kHz and 167,5 kHz; at any r.f. input signal level between 90dB (fw) and the level determined according to
34、2.1 above; at a modulation frequency of 5 kHz and 16,75 kHz deviation; at a modulation frequency of 40 Hz and 167,5 kHz deviation. METHOD OF MEASUREMENT 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. According to IEC
35、 6031 5-4, 5.8. According to 5.4 of IEC 60315-4, using the fixed position of the output level control (see 1.3.1). According to 5.2 of IEC60315-4, with an r.f. input signal level of 70 dB(fW), a modulation frequency of 1 kHz and a deviation of 167,5 kHz, except where otherwise stated. The equipment
36、shall be in the stereo mode. NOTE - To 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 valid only if at least 10 dB higher than the noise level. STD*BSI BS EN b1
37、305-2-ENGL 1798 M 1b24bb7 Ob78148 7T5 Page 6 EN 61305-2 : 1998 2.5 Overall difference-frequency distortion, According to 5.3.2a) of IEC 60315-4, but expressed as the output level of the 1 kHz using modulation frequencies of 14 kHz (3rd order) distortion product relative to the and 15 kHz at 1375 kHz
38、 deviation. The output voltage produced by 1 kHz modulation at *75 kHz deviation. equipment shall be in the mono mode. 2.6 Intermodulation due to ultrasonic According to 5.3.2) of IEC 60315-4, using a components expressed as the output level of modulation frequency of 10 kHz at i40 kHz the 1 kHz pro
39、duct (see 1.4). deviation only. 2.7 Channel separation of each channel According to 5.7.2 of IEC60315-4. from the other, expressed in decibels Measurements shall be made at the referred to the output level produced by frequencies 250 Hz, 1 kHz, 6,3 kHz and modulation at the relevant frequency. 12,5
40、kHz. In order to allow the use of automatic measuring equipment, the deviation shall be set at each frequency in in accordance with the appropriate 50s or 75 ps pre-emphasis characteristic (see table 1). 2.8 Unweighted (band-limited) signal-to- According to 2.2.1 .a) of IEC 60315-4, using noise rati
41、o, expressed in decibels as: the band-pass filter specified therein and a true r.m.s. meter. 20 ww,) where U, is the reference output voltage produced by i kHz modulation at 175 kHz deviation (mono) or 167,5 kHz deviation (stereo); U, is the noise output voltage. 2.9 A-weighted signal-to-noise ratio
42、, ex- According to 2.2.1 b) of IEC 60315-4. pressed as in 2.8. 2.10 Capture ratio 2.1 1 AM suppression According to 3.1.2 of IEC60315-4, but in mono mode, using a deviation of 175 kHz. According to 3.4.2.2 of IEC 60315-4 (sequential method). 2.12 Selectivity at low signal level, According to 3.2.2 o
43、f IEC 60315-4. The audio expressed as the r.f. input signal level at frequency output shall be measured using XkHz (see below) off-tune required to give the band-pass filter described in 1.4.1.3 of 20 dB signal-to-noise ratio, referencing the IEC 60315-4 and figure 2a, and a true r.m.s. a.f. output
44、due to a wanted signal input level meter. The wanted signal level shall first be of 70 dB (fW), when the wanted signal level set at 70 dB (fW), with a modulation is 30 dB (fW) (see 1.4). frequency of 1 kHz and a deviation of Y kHz (see below). Page 7 EN 61305-2 : 1998 For equipment intended for use
45、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, Xis 400 kHz (two 200 kHz channels from the wanted channel) and Y is 75 kHz. NOTE - The 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 30 dB (fW). The frequency difference between the wanted and unwanted signals shall be X kHz (see above) and the unwanted signal shall be modulated at 1 kHz with *Y kHz (see above) deviation. The level of the u
48、nwanted signal is then adjusted until the a.f. output level is 20 dB below that first measured. NOTE - Attention is drawn to ITU-R BS.412-7, 85.450-2, BS.641 and BS.704, accepted unanimously by the member administrations. Although the measurement conditions specified in this standard vary with ITU r
49、egions, 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 (see 1.4) According to 3.3.2.2 of IEC 60315-4. 2.14 Single-signal image rejection (see 1.4) According to 3.3.2.2 of IEC 60315-4. 2.15 Single-signal spurious rejection at the According to 3.3.2.2 of IEC 60315-4. signal frequency plus half the intermediate frequency (see 1.4). 2.16 Spurious response caused by two According to 3.5.2.2 of IEC60315-
