IEC 61051-1-ed.3.0

Anotácia textu normy IEC 61051-1-ed.3.0 :

IEC 61051-1:2018 is a generic specification and is applicable to varistors with symmetrical voltage-current characteristics for use in electronic equipment. It establishes standard terms, inspection procedures and methods of test for use in sectional and detail specifications for quality assessment or any other purpose. This edition includes the following significant technical changes with respect to the previous edition: a) 10 new terms and definitions – leaded varistors, surface mount varistors(SMV), electrostatic discharge (ESD), ESD clamping voltage, equivalent rectangular pulse duration, maximum peak current derating characteristic, rated average dissipation power, rated energy, abnormal overvoltage withstanding duration and temperature derating curve – have been added (see 3.6, 3.7, 3.14, 3.15, 3.19, 3.20, 3.23, 3.24, 3.25 and 3.29); b) General requirements for electrical tests and 7 new test items – clamping voltage, ESD clamping voltage, maximum peak current, rated average dissipation power, rated energy, electrostatic discharge (ESD), robustness of terminations of surface mount varistors – have been added (see 6.5, 6.11, 6.12, 6.13, 6.14, 6.15, 6.16 and 6.17.8); c) In 6.6, 6.7, 6.8, 6.9.3, 6.23.2, 6.23.4 and 6.26, following test items have been revised: - Varistor voltage, leakage current and capacitance: more detailed requirements and information have been added; - Voltage proof – foil method: the space between the edge of the foil and each termination has been changed from 1 mm ~ 1,5 mm to 3 mm ~ 3.5 mm for testing varistors not having axial terminations and the minimum space between the foil and the termination has been changed from 1 mm to 3 mm for testing varistors having axial terminations; - Climatic sequence – dry heat: the method has been changed from Ba to Bb; - Climatic sequence – cold: the method has been changed from Aa to Ab; - Endurance at upper category temperature: the method of “applying test voltages in cycles of 1,5 h on and 0,5 h off” has been changed to the method of applying test voltages continuously throughout the test lasting for 1 000 h; d) The test items of pulse current, voltage under pulse condition and bump have been deleted from the section of test and measurement procedures; e) Annex A and the contents referring to the test fixture specified in Annex A have been deleted; f) All contents related to silicon carbide varistors have been deleted; g) A new normative annex entitled “Test pulses used in this specification” (Annex B) has been added; h) A new informative annex entitled "Recommended measurement/test methods for characteristics and parameters for application reference" (Annex C) has been added, in which guidelines of measuring/testing characteristics and parameters for application reference including voltage vs. current characteristic, maximum peak current derating characteristic, thermal resistance and abnormal overvoltage withstanding duration have been given. LIEC 61051-1:2018 est une specification generique applicable aux varistances a caracteristiques tension-courant symetriques, utilisees dans les equipements electroniques. Elle etablit les termes normalises, les procedures de controle et les procedures dessai utilises dans les specifications intermediaires et particulieres a des fins dassurance de la qualite ou a toute autre fin. Cette edition inclut les modifications techniques majeures suivantes par rapport a ledition precedente: a) 10 nouveaux termes et definitions (varistances a fils, varistances montees en surface (VMS), decharge electrostatique (DES), tension decretage de DES, duree dimpulsion rectangulaire equivalente, caracteristique de reduction du courant maximal de crete, puissance de dissipation moyenne assignee, energie assignee, duree de resistance a une surtension anormale et courbe de reduction de la temperature) ont ete ajoutes (voir 3.6, 3.7, 3.14, 3.15, 3.19, 3.20, 3.23, 3.24, 3.25 et 3.29); b) des exigences generales pour les essais electriques et 7 nouveaux essais (tension decretage, tension decretage de DES, courant maximal de crete, puissance de dissipation moyenne assignee, energie assignee, decharge electrostatique (DES), robustesse des sorties des varistances montees en surface) ont ete ajoutes (voir 6.5, 6.11, 6.12, 6.13, 6.14, 6.15, 6.16 et 6.17.8); c) en 6.6, 6.7, 6.8, 6.9.3, 6.23.2, 6.23.4 et 6.26, les essais suivants ont ete revises: - Tension de la varistance, courant de fuite et capacite: des exigences et des informations plus detaillees ont ete ajoutees; - Tenue en tension – methode de la feuille metallique: lespace entre le bord de la feuille et chaque sortie a ete modifie de 1 mm ~ 1,5 mm a 3 mm ~ 3,5 mm pour soumettre a lessai les varistances qui ne possedent aucune sortie axiale et lespace minimal entre le bord de la feuille et la sortie a ete modifie de 1 mm a 3 mm pour soumettre a lessai les varistances qui possedent des sorties axiales; - Sequence climatique – chaleur seche: la methode a ete modifiee (Ba en Bb); - Sequence climatique – froid: la methode a ete modifiee (Aa en Ab); - Endurance a la temperature maximale de categorie: la methode consistant a "appliquer des tensions dessai par cycles de 1,5 h dapplication et de 0,5 h de repos" a ete modifiee au profit de la methode consistant a appliquer des tensions dessai en continu tout au long de lessai qui dure 1 000 h; d) les essais de courant dimpulsion, de tension en condition dimpulsion et de secousses ont ete supprimes de larticle concernant les procedures dessai et de mesure; e) lAnnexe A et les contenus qui font reference aux appareils de montage dessai specifies a lAnnexe A ont ete supprimes; f) tous les contenus concernant les varistances au carbure de silicium ont ete supprimes; g) une nouvelle annexe normative intitulee "Impulsions dessai utilisees dans la presente specification" (Annexe B) a ete ajoutee; h) une nouvelle annexe informative intitulee "Methodes de mesure/dessai recommandees pour les caracterist