ISO INTERNATIONAL STANDARD 7278-3 Second edition 1998-02-15 Liquid hydrocarbons Dynamic measurement Proving systems for volumetric meters - Part 3: Pulse interpolation techniques pour compteurs volumétriques - Partie 3: Techniques d'interpolation des impulsions Tso Reference number ISO 7278-3:1998(E) HS under I without license from IHS Not for Resale ISO 7278-3:1998(E) Contents Page 1 Scope. 1 2 Normative reference 3 Definitions 4 Principles . 2 4.1 General 2 4.2 Double-timing method. 2 4.3:Quadruple-timing method . 3 4.4:Phase-locked-loop method.. 4 Conditions of use 5 5.1 General. 5 5.2 Double-timing method.. 5 5.3 Quadruple-timing method .. 6 5.4 Phase-locked-loop method... 6 6 Meter requirements.. 6 Tests for pulse interpolation system 7 7.1 General 7.2 Test circuit . 8 7.3 Test schedule 8 7.4 Immunity from electrical noise ... 9 8Test report and markings... 9 Annex A (normative) Measurement techniques for determining pulse intervals 10 Annex B (informative) Bibliography 12 @ISO1998 d, 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 the publisher. InternationalOrganizationforStandardization Case postale 56 . CH-1211 Geneve 20 · Switzerland Internet [email protected] X.400 C=ch; a=400net; p=iso; 0=isocs; S=central Printed in Switzerland Copyright International Organization for Standardization Not for Resale @ISO ISO7278-3:1998(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.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhas liaison with isO, also take part in the work. isO collaborates 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 7278-3 was prepared by Technical Committee ISO/TC 28, Petroleum products and lubricants, Subcommittee SC 2, Dynamic petroleum measurement. This second edition cancels and replaces the first edition (iSO 7278-3:1986), which has been technically revised, in particular with addition of annex A and annex B. Proving systems for volumetric meters: Part 1: General principles —Part 2: Pipe provers Part 3: Pulse interpolation techniques Part 4: Guide for operators of pipe provers Part 5:Small volume/compact provers Annex A forms an integral part of this part of ISO 7278. Annex B is for information only. ili