Amendment 2 - Limits and methods of measurement of immunity characteristics of sound and television broadcast receivers and associated equipment

Describes the measurement methods to evaluate the chrominance performance in SECAM non-broadcast video tape recorders. Because of the frequency modulation used in the SECAM system, special methods of measurement are required for testing the chrominance performance.

Amendement 2 - Limites et méthodes de mesure des caractéristiques d immunité des récepteurs de radiodiffusion et de télévision et équipements associés

Décrit les méthodes de mesure pour évaluer les performances des voies chrominance des magnétoscopes SECAM hors radiodiffusion. La modulation de fréquence étant utilisée dans le système SECAM, des méthodes spéciales de mesure sont exigées pour relever les performances des voies chrominance.

General Information

Status
Published
Publication Date
31-Jul-1997
Current Stage
DELPUB - Deleted Publication
Start Date
12-Aug-1998
Completion Date
26-Oct-2025

Relations

Effective Date
05-Sep-2023
Effective Date
05-Sep-2023

Overview

CISPR 20:1996/AMD2:1997 is an important amendment published by the International Electrotechnical Commission (IEC) that focuses on the limits and methods of measurement of immunity characteristics of sound and television broadcast receivers along with associated equipment. This amendment specifically addresses the immunity testing methodologies for outdoor units of Direct-To-Home (DTH) satellite receiving systems designed for individual reception.

Enhanced measurement techniques are detailed to evaluate the chrominance performance in SECAM non-broadcast video tape recorders, considering the particular challenges posed by frequency modulation used in the SECAM system. This standard is vital for manufacturers and testing laboratories involved in the design, development, and certification of broadcast receivers and satellite equipment, ensuring compliance with electromagnetic compatibility (EMC) requirements and robustness against interference.

Key Topics

  • Immunity Characteristics: Establishes the immunity limits for both sound and television receivers, particularly for outdoor satellite reception units, to withstand undesired signals without performance degradation.

  • Measurement Methods: Introduces advanced measurement setups for satellite television and sound receivers, including modulation by frequency using color bar signals for TV and audio frequency signals for sound receivers. Frequency modulated signals closely reflect real broadcast conditions.

  • Satellite Receiver Testing: Specifies detailed procedures for testing satellite receivers at tuned channels under conditions of unwanted signal interference in adjacent channels according to precise limits (see Table 17 in the standard).

  • Signal Types and Parameters: Defines signal types A1, A2, A3, and A4 with varied channel spacing, deviation sensitivity, and energy dispersion designed for MAC/packet, PAL, and SECAM receivers. This differentiation ensures meaningful and accurate immunity evaluations for different broadcast systems.

  • Modular Equipment Considerations: Clarifies that tuners, frequency converters, and other modular units performing parts of the receiving function are encompassed within the scope as they affect immunity characteristics.

  • Screening Effectiveness: Provides limits for the shielding effectiveness of both terrestrial and satellite receivers to prevent unwanted electromagnetic interference, enhancing reliability and signal integrity.

Applications

  • Broadcast Receiver Development: Electronics companies can apply CISPR 20 amendment 2 standards during design and production phases to meet international EMC immunity limits for satellite and terrestrial sound and television systems.

  • EMC Testing & Certification: Test laboratories use the standardized measurement methods and immunity limits to assess broadcast receivers, ensuring compliance and enabling equipment certification for global markets.

  • Satellite Reception Systems: Manufacturers of DTH satellite outdoor units benefit from this guidance to validate immunity against adjacent channel interference, improving user reception quality.

  • Modular Tuner and Converter Design: Component suppliers develop tuners and frequency converters aligned with these immunity criteria, facilitating integration into compliant broadcast reception devices.

  • Quality Assurance: Service centers and quality departments adopt the immunity test methods to diagnose and improve receiver robustness against radiofrequency disturbances.

Related Standards

  • IEC 60728-2: Covers cabled distribution systems for television and sound, particularly the electromagnetic compatibility of equipment involved in collective satellite reception such as cable distribution headends and community antenna television (CATV) or master antenna television (MATV) systems.

  • CISPR 11 and CISPR 22: Address EMC requirements for industrial, scientific, medical equipment and information technology equipment that may interface with broadcast receivers.

  • IEC 62132 Series: EMC test methodologies applicable to radio receivers and transceivers, complementing CISPR 20's focus on immunity measurement.

  • IEC Electropedia: The IEC's Online Electrotechnical Vocabulary provides detailed definitions of terms referenced in CISPR 20, supporting clear understanding and uniform interpretation.


By adhering to CISPR 20:1996/AMD2:1997, stakeholders in the broadcast and satellite receiver industries can ensure their products maintain optimal immunity performance in complex electromagnetic environments. This leads to improved user experience, regulatory compliance, and enhanced global market acceptance.

Standard

CISPR 20:1996/AMD2:1997 - Amendment 2 - Limits and methods of measurement of immunity characteristics of sound and television broadcast receivers and associated equipment Released:8/1/1997 Isbn:2831839742

English and French language
9 pages
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Frequently Asked Questions

CISPR 20:1996/AMD2:1997 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Amendment 2 - Limits and methods of measurement of immunity characteristics of sound and television broadcast receivers and associated equipment". This standard covers: Describes the measurement methods to evaluate the chrominance performance in SECAM non-broadcast video tape recorders. Because of the frequency modulation used in the SECAM system, special methods of measurement are required for testing the chrominance performance.

Describes the measurement methods to evaluate the chrominance performance in SECAM non-broadcast video tape recorders. Because of the frequency modulation used in the SECAM system, special methods of measurement are required for testing the chrominance performance.

CISPR 20:1996/AMD2:1997 is classified under the following ICS (International Classification for Standards) categories: 33.100.20 - Immunity; 33.160.40 - Video systems. The ICS classification helps identify the subject area and facilitates finding related standards.

CISPR 20:1996/AMD2:1997 has the following relationships with other standards: It is inter standard links to CISPR 20:1996, CISPR 20:1998. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

You can purchase CISPR 20:1996/AMD2:1997 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of IEC standards.

Standards Content (Sample)


CISPR 20 ®
Edition 3.0 1997-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
COMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES

AMENDMENT 2
AMENDEMENT 2
Limits and methods of measurement of immunity characteristics of sound and
television broadcast receivers and associated equipment

Limites et méthodes de mesure des caractéristiques d’immunité des récepteurs
de radiodiffusion et de télévision et équipements associés

CISPR 20:1996/A2:1997
Copyright © 1997 IEC, Geneva, Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by
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please contact the address below or your local IEC member National Committee for further information.

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publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

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CISPR 20 ®
Edition 3.0 1997-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
COMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES

AMENDMENT 2
AMENDEMENT 2
Limits and methods of measurement of immunity characteristics of sound and
television broadcast receivers and associated equipment

Limites et méthodes de mesure des caractéristiques d’immunité des récepteurs
de radiodiffusion et de télévision et équipements associés

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX E
ICS 33.100 ISBN 2-8318-3974-2
– 2 – CISPR 20 amend. 2 © CEI:1997
AVANT-PROPOS
Le présent amendement a été établi par le sous-comité E du CISPR: Perturbations relatives
aux récepteurs radioélectriques.
Le texte de cet amendement est issu des documents suivants:
FDIS Rapport de vote
CISPR/E/158/FDIS CISPR/E/162/RVD

Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote
ayant abouti à l'approbation de cet amendement.
__________
Page 6
1 Domaine d'application et objet
Insérer, après le premier alinéa, le nouveau texte suivant:
La présente publication concerne aussi l'immunité des unités extérieures des systèmes de
réception individuelle par satellite.
NOTE – Les systèmes de réception collective par satellite, en particulier:
– têtes de réseau de distribution par câble
– systèmes de réception avec antennes collectives limitées à un bâtiment
sont couverts par la CEI 60728-2.
2 Références normatives
Ajouter la référence suivante:
CEI 60728-2: Systèmes de distribution par câble destinés aux systèmes de radiodiffusion
1)
sonore et de télévision – Partie 2: Compatibilité électromagnétique pour les matériels
Page 8
3 Définitions
Insérer, après 3.2 «immunité interne» et avant «efficacité du blindage», les nouvelles
définitions suivantes:
3.3 récepteurs de radiodiffusion sonore: Appareils prévus pour la réception des
émissions de radiodiffusion sonore et des services analogues, transmis par radiodiffusion
terrestre, par câble et par satellite.
3.4 récepteurs de télévision: Appareils prévus pour la réception des émissions de
télévision et des services analogues, transmis par radiodiffusion terrestre, par câble et par
satellite.
______
1)
A publier.
CISPR 20 Amend. 2 © IEC:1997 – 3 –
FOREWORD
This amendment has been prepared by CISPR subcommittee E: Interference relating to radio
receivers.
The text of this amendment is based on the following documents:
FDIS Report on voting
CISPR/E/158/FDIS CISPR/E/162/RVD

Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
__________
Page 7
1 Scope and object
Insert, after the first paragraph, the following new paragraph:
This publication is also applicable to the immunity of outdoor units of direct to home (DTH)
satellite receiving systems for individual reception.
NOTE – Satellite receiving systems for collective reception, in particular:
– cable distribution head ends (Community Antenna Television, CATV)
– community reception systems (Master Antenna Television, MATV)
are covered by IEC 60728-2.
2 Normative references
Add the following reference:
IEC 60728-2: Cabled distribution systems for television and sound systems – Part 2:
1)
Electromagnetic compatibility of equipment
Page 9
3 Definitions
Insert, after 3.2 "internal immunity" and before "screening effectiveness", the following
additional definitions:
3.3 sound receivers: Appliances intended for the reception of sound broadcast and similar
services for terrestrial, cable and satellite transmissions.
3.4 television receivers: Appliances intended for the reception of television broadcast and
similar services for terrestrial, cable and satellite transmissions.
______
1)
To be published.
– 4 – CISPR 20 amend. 2 © CEI:1997
NOTES
1 Les éléments modulaires qui réalisent une partie des fonctions des systèmes de réception de radiodiffusion
sonore ou de télévision (comme les syntoniseurs, les convertisseurs de fréquence, les amplificateurs, les
modulateurs, etc.) sont considérés comme des récepteurs de radiodiffusion sonore ou comme des récepteurs
de télévision selon le cas.
2 Les syntoniseurs peuvent être équipés d'un étage de réception pour la radiodiffusion par satellite et de
démodulateurs, décodeurs, démultiplexeurs, convertisseurs numérique/analogique, codeurs (par exemple
codeurs NTSC, PAL ou SECAM), etc.
3 Les convertisseurs de fréquence peuvent être équipés d'un étage de réception pour la radiodiffusion par
satellite et de dispositifs qui convertissent les signaux dans d'autres bandes de fréquence.
4 Les récepteurs, les syntoniseurs ou les convertisseurs de fréquence peuvent être accordables ou peuvent
être conçus pour recevoir uniquement une fréquence fixe.
Page 26
Ajouter après le paragraphe 4.2.4 les nouveaux paragraphes suivants:
4.2.5 Récepteurs de télévision par satellite
Les récepteurs de télévision par satellite doivent être essayés selon 5.6.4 après réglage sur
le canal N et soumis à un signal non désiré dans le canal M comme indiqué dans le tableau
17, du type sélectionné entre A , A , A , A selon le cas.
1 2 3 4
Tableau 17 – Limites de l'immunité interne des récepteurs par satellite
Signal non désiré dans le canal M
Canal utile Niveau dB(µV) Type
N N – 2 N – 1 N + 1 N + 2
70 66 66 70 A ou A ou
N + 3
1 2
min
A ou A
70 66 66 70
3 4
N
cent
70 66 66 70
...

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