ISO INTERNATIONAL STANDARD 11221 First edition 2011-08-01 Space systems Space solar panels - Spacecraft charging induced electrostatic discharge test methods Systemes spatiaux Panneaux solaires spatiaux -Materiaux d'essai de décharge électrostatique induite par la charge du vaisseau spatial Reference number ISO 11221:2011(E) @ ISO 2011 py IHS under lic ted without license from IHS Not for Resale ISO 11221:2011(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO2011 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IsO at the address below or IsO's member body in the country of the requester. ISO copyright office Case postale 56 : CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @IsO2011-All rights reserved y IHS unde itted without license from IHS Not for Resale ISO 11221:2011(E) Contents Page Foreword 1 Scope 2 Terms and definitions 3 Symbolsandabbreviatedterms.. 3.1 Symbols.... 3.2 Abbreviated terms 4 Tailoring 5 TestItems. 6 Preliminary tests for ESD inception statistics 0 6.1 Purpose 10 6.2 Test facility 10 6.3 Test coupon. 10 6.4 External circuit.. 10 6.5 Test procedures. 6.6 Estimation of number of ESD events in orbit.. 7 Qualification test for secondary arc 12 7.1 Purpose.. 7.2 Triggering method and test facility - 12 7.3 External circuit..... 12 7.4 CIc gaptest - - Test coupon and procedures .. 13 7.5 Panel test - Test coupon and procedures .... 13 7.6 13 8 Characterization tests for robustness to EsD and plasma interaction ... 14 8.1 Power degradation . 14 8.2 Secondary arc.... 15 8.3 Power leakage to plasma..... 15 8.4 Solar array back surface test 17 9 Test report. Annex A (informative) Plasma interaction and electrostatic discharge effects on solar array ... Annex B (informative) Secondary arc qualification processes. 22 Annex C (normative) Chamber size for a test using LEO-like plasma . .23 Annex D (informative) ESD events analysis.... Annex E (informative) Spacecraft charging analysis .... .27 Annex F (informative) Derivation of theoretical surface flashover current .. 29 Annex G (normative) External circuit of secondary arc test.. Annex H (informative) Solar cell I-V characteristics measurement... Annex I (informative) Secondary arc statistics.... Annex J (informative) Solar array back surface test. 41 Bibliography. 42 ili Not for Resale

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