ISO INTERNATIONAL STANDARD 9846 First edition 1993-12-01 Solar energy Calibration of a pyranometer using a pyrheliometer Energie solaire -- Etalonnage d'un pyranometre utilisant un pyrheliometre Reference number ISO 9846:1993(E) Copyright International Organization for Standardizatior T networking permited without license from IHS Not for Resale ISO 9846:1993(E) Contents Page 1 Scope 2 Normative references 3 Definitions 4 Selection of methods 2 5 Alternating sun-and-shade method 2 6 Continuous sun-and-shade method 5 Certificate of calibration 8 Uncertainty 8 Annexes A Shade disc devices 9 B Calculation of the angle of incidence n of a solar beam on an inclined plane 14 c Extended version of the sun-and-shade method 16 D Multiple-reading version of the alternating sun-and-shade method 17 E Extended version of thecontinuous sun-and-shade method 18 F Comparison of the alternating sun-and-shade method (AsSM) and the continuous sun-and-shade method (CossM) 19 G Bibliography 20 OISO1993 All rights reserved. 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 per- mission in writing from the publisher. International Organization for Standardization Case Postale 56 . CH-1211 Geneve 20 · Switzerland Printed in Switzerland ii Provided by IHS under license with ISC Not for Resale ISO 9846:1993(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through IsO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. isO coilaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 9846 was prepared by Technical Committee ISO/TC 180, Solar energy, Sub-Committee SC 1, Climate -- Measurement and data. Annexes A, B, C, D, E, F and G of this International Standard are for in- formation only. ili No reproduction or networking permited without license from IHs Not fr esale