IEC-CISPR-TR-16-3-2003.pdf
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1、 TECHNICAL REPORT CISPR 16-3 2003 AMENDMENT 2 2006-11 Amendment 2 Specification for radio disturbance and immunity measuring apparatus and methods Part 3: CISPR technical reports PRICE CODE IEC 2006 Droits de reproduction rservs Copyright - all rights reserved International Electrotechnical Commissi
2、on, 3, rue de Varemb, PO Box 131, CH-1211 Geneva 20, Switzerland Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmailiec.ch Web: www.iec.ch X For price, see current catalogue Commission Electrotechnique Internationale International Electrotechnical Commission INTERNATIONAL SPECIAL CO
3、MMITTEE ON RADIO INTERFERENCE 2 TR CISPR 16-3 Amend. 2 IEC:2006(E) FOREWORD This amendment has been prepared by CISPR subcommittee A: Radio interference measurements and statistical methods. The text of this amendment is based on the following documents: DTR Report on voting CISPR/A/659/DTR CISPR/A/
4、681/RVC CISPR/A/662/DTR CISPR/A/678/RVC Full information on the voting for the approval of this amendment can be found in the report on voting indicated in the above table. The committee has decided that the contents of this amendment and the base publication will remain unchanged until the maintena
5、nce result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. _ Page 7 3 Definitions Add, on page 9, after 3.11, the following new d
6、efinitions: 3.12 weighting (e.g. of impulsive disturbance) the pulse-repetition-frequency (PRF) dependent conversion (mostly reduction) of a peak- detected impulse voltage level to an indication which corresponds to the interference effect on radio reception NOTE 1 For the analog receiver, the inter
7、ference effect is the psychophysical annoyance, i.e. a subjective quantity (audible or visual, usually not a certain number of misunderstandings of a spoken text). For the digital receiver, the interference effect may be defined by the critical Bit Error Ratio (BER) (or Bit Error Probability (BEP),
8、for which perfect error correction can still occur, or by another objective and reproducible parameter. 3.13 weighting characteristic the peak voltage level as a function of PRF for a constant effect on a specific radio- communication system, i.e., the disturbance is weighted by the radio communicat
9、ion system itself TR CISPR 16-3 Amend. 2 IEC:2006(E) 3 3.14 weighting function weighting curve the relationship between input peak voltage level and PRF for constant level indication of a measuring receiver with a weighting detector, i.e. the curve of response of a measuring receiver to repeated pul
10、ses 3.15 weighting factor the value in dB of the weighting function relative to a reference PRF or relative to the peak value 3.16 weighting detector detector which provides an agreed weighting function 3.17 weighted disturbance measurement measurement of disturbance using a weighting detector Page
11、10 4 Technical Reports Add, after the existing subclause 4.7 published in Amendment 1, the following new subclauses 4.8 and 4.9: 4.8 Background material on the definition of the r.m.s.-average weighting detector for measuring receivers 4.8.1 Introduction purpose of weighted measurement of disturbanc
12、e Generally, a weighted measurement of impulsive disturbance serves the purpose of minimizing the cost of disturbance suppression, while keeping an agreed level of radio protection. The weighting of a disturbance for its effect on modern digital radiocommunication services is important for the defin
13、ition of emission limits that will protect these services. Amendment 1 of CISPR 16-1-1 defines a detector that is a combination of an r.m.s. and an average detector. The selection of the type of detector and of the transition between these detector functions is based on measurements and theoretical
14、investigations. 4.8.2 General principle of weighting the CISPR quasi-peak detector The effect on radiocommunication services depends on the type of interference (e.g. broadband or narrowband, pulse rate etc.) and on the type of service itself. The effect of the pulse rate was recognized a short time
15、 after the CISPR was founded in 1933. As a result, the quasi-peak weighting receiver for the frequency range of 150 kHz to 1 605 kHz was defined as shown for band B in Figure 4.8.1. However in CISPR 1 1 it was already accepted that “Subsequent experience has shown that the r.m.s. voltmeter might giv
16、e a more accurate assessment” but the quasi-peak type of voltmeter has been retained for certain reasons mainly for continuity. 4 TR CISPR 16-3 Amend. 2 IEC:2006(E) 1 kHz 10 100 1 32 28 24 20 16 12 8 4 0 4 8 12 34 Single pulse 43,5 dB Pulse rate Rel. input level for constant indication dB 0,15 MHz-3
17、0 MHz (band B) 9 kHz-150 kHz (band A) 30 MHz-1000 MHz (band C and D) IEC 2010/06 Figure 4.8.1 Weighting curves of quasi-peak measuring receivers for the different frequency ranges as defined in CISPR 16-1-1. The weighting factor is shown relative to a reference pulse rate (25 Hz or 100 Hz) 4.8.3 Oth
18、er detectors defined in CISPR 16-1-1 Peak detector The peak detector follows the signal at the output of the IF envelope detector and holds the maximum value during the measurement time (also called dwell time) until its discharge is forced. This indication is independent of the pulse repetition fre
19、quency (PRF). Average detector The average detector determines the linear average of the signal at the output of the IF envelope detector. It should be kept in mind that for low PRFs, CISPR 16-1-1 specifies the average detector measurement result as the maximum scale deflection of a meter with a tim
20、e constant specified for the quasi-peak detector. This is necessary to avoid reduced level indication for a pulse modulated disturbance by using long measurement times. The weighting function varies with 20 dB per decade of the PRF (see Figure 4.8.2). RMS detector The r.m.s. detector determines the
21、r.m.s. value of the signal at the output of the IF envelope detector. Despite being mentioned in 1 and being described in CISPR 16-1-1, at the time of writing of this report it has not been put to practical use in CISPR product standards. The weighting function varies with 10 dB per decade of the PR
22、F (see Figure 4.8.2). Up to now, no meter time constant applies for the r.m.s. detector for intermittent, unsteady and drifting narrowband disturbances. TR CISPR 16-3 Amend. 2 IEC:2006(E) 5 Comparison of detector weighting functions (example for bands C and D with 120 kHz bandwidth) 0 10 20 30 40 50
23、 60 70 1 10 1001 00010 000100 000 1 000 000 fp/Hz Weighting factor/dB Average RMS Quasi-Peak Peak IEC 2011/06 Figure 4.8.2 Weighting curves for peak, quasi-peak, r.m.s. and linear average detectors for CISPR bands C and D 4.8.4 Procedures for measuring pulse weighting characteristics of digital radi
24、ocommunications services All modern radio services use digital modulation schemes. This is not only true for mobile radio but also for audio and TV. Procedures for data compression and processing of analog signals (voice and picture) are used together with data redundancy for error correction. Usual
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