ISO INTERNATIONAL STANDARD 1608-1 Second edition 1993-12-01 Vapour vacuum pumps -- Measurement ofperformancecharacteristics Part 1: Measurement of volume rate of flow (pumping speed) Pompes a vide a jet de vapeur - Mesurage des caractéristiques fonctionnelles Partie 1: Mesurage du débit-volume ISO Reference number ISO 1608-1:1993(E) ISO1608-1:1993(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 and non-governmental, in liaison with IsO, also take part in the work. iso (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 a vote. International Standard ISO 1608-1 was prepared by Technical Committee ISo/TC 112, Vacuum technology, Sub-Committee Sc 3, Measurement of the performance characteristics of vacuum pumps. This second edition cancelsand replaces the first edition (iS0 1608-1:1980), which has been technically revised. vacuum pumps Measurement of performance characteristics: - Part 1: Measurement of volume rate of flow (pumping speed) -- Part 2: Measurement of critical backing pressure ISO1993 mission in writing from the publisher. International Organization for Standardization Case Postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland ii ISO1608-1:1993(E) Introduction The purpose of IsO 1608 is to ensure that measurements of the per- formance characteristics of vapour vacuum pumps are, as far as possible, carried out by uniform procedures and under uniform conditions. It is in manufacturers' literature will be on a properly comparable basis to the benefit of both user and manufacturer. It is envisaged that the complete International Standard will in due course, deal comprehensively with the measurement of a wide range of perform- ance characteristics of the main types of vapour vacuum pumps. In order, however, that useful agreements of more restricted scope may be im- plemented with the least possible delay, IsO 1608 is published in parts. ！!