1、AECMA STANDARD NORME AECMA AECMA NORM Edition approved for publication 1993-12-31 prEN 2591-G7 Edition P 1 December 1993 C2 Chairman M. J. Le Cunff Comments should be sent within six months after the date of publication to AECMA Technopolis - 175, rue Jean-Jacques Rousseau 921 38 Issy-les-Moulineaux
2、 Cedex - FRANCE DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cedex - Tl. (1) 47.36.98.76 UDC : 621.31 6.5:620.1:629.7 Descriptors : Aircraft industry, aircraft equipment, connecting equipment, test E
3、NGLISH VERSION Aerospace series Elements of electrical and optical connection Test methods Part 67 - Electrical elements Measurement of characteristic impedance of a bus or a stub terminator Srie arospatiale Organes de connexion lectrique et optique Mthodes dessais Partie G7 - Organes lectriques Mes
4、ure de limpdance caractristique dun bus ou dune terminaison de drivation Luft- und Raumfahrt Elektrische und optische Verbindungselemente Prfverfahren Teil G7 - Elektrische Elemen 2 Messung der Impedanz von einem Bus- oder Stubabschlu This Merospace Series“ Prestandard has been drawn up under the re
5、sponsibility of AECiMA IAssociation Europenne des Constructeurs de Matriel Arospatial). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Technical Committee following comment by the Member countries. Subsequent to the pub
6、lication of this prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Of
7、ficial Services of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. Page 3 prEN 2591-G7:1993 1 Scope This standard specifies a method of measuring the characteristic impedance of : - a permanent bus terminator; -
8、a removable bus or stub terminator. It shall be used together with EN 2591. 2 Normative references EN 2591 Aerospace series - Elements of electrical and optical connection - Test methods - General 1) 3 Preparation of specimens 3.1 Permanent bus terminator The terminator shall be wired with a length
9、of cable lower than 300 mm as stipulated by the product standard. 3.2 The terminator shall be terminated on its connector as stipulated in the product standard. Removable bus or stub terminator 3.3 Unless indicated in the technical specification, the following details shall be specified : - impedanc
10、e value; - test temperature. 4 Method The measurement shall require the use of an impedance meter. The test signal shall be sinusodal, frequency 75 kHz and 1 MHz, amplitude 2 0,3 V r.m.s 5 Requirement Impedance shall comply with the value specified in the technical specification. Previous page is blank 1) At the date of publication of this standard, general aspects of elements of optical connection are covered by a draft amendment which is in preparation to the European Standard EN 2591.
