ISO INTERNATIONAL STANDARD 4834 Second edition 1997-12-15 Cinematography Magnetic sound test films excluding striped release prints - Basic technical characteristics Cinematographie - Films magnetiques sonores étalons a I'exclusion des copies d'exploitation - Caractéristiques techniques de base TSO Referencenumber ISO 4834:1997(E) ISO 4834:1997(E) Foreword IsO (the International Organization for Standardization) is a worldwide federationofnationalstandardsbodies(lsOmemberbodies).Theworkof 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 SO, also take part in the work. isO collaborates closely with the International Electrotechnical Commission (lEC)onallmattersofelectrotechnicalstandardization. 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 4834 was prepared by Technical Committee ISO/TC 36, Cinematography. This second edition cancels and replaces the first edition (iSO 4834:1986), of which it constitutes a technical revision. @ISO1997 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced microfilm, without permission in writing from the publisher. International Organization for Standardization 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 ii @ ISO ISO4834:1997(E) Introduction Two types of magnetic test films have been in wide use. They have differed in the manner of measuring the magnetic flux level and in the detailed agreement as follows: Type 185 Magnetic flux levels are measured by the procedures of ANSI S4.6[2 and IEC 94-313. The reference level is 185 nWb/m. The fre quency series is 6 dB below reference level. These films were developed for use with a mains frequency of 60 Hz, and for measurement with Standard Volume Indicator (SVl) meters conforming to ANSI C16.5[6]. Type 320 — Magnetic flux levels are measured by the procedures of DIN 455204. The reference level is 320 nWb/m. The frequency series is 10 dB below reference level. The calibrations differ from those obtained by type 185 test film, and generally indicate a result about 1 dB higher for identical flux levels. These films were developed for use with a mains frequency of 5o Hz, and for measurement with Standard Peak Programme (SPP) meters conforming to IEC 268-10l7. A compromise format has been developed that provides the functional This International Standard describes that universalformat. ili