ISO/TS 13475-2:2000 音響学—屋外で使用される静止した可聴警告装置—パート2：音の放出量を決定するための正確な方法 | ページ 2

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 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.

The main task of technical committees is to prepare International Standards. 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.

In other circumstances, particularly when there is an urgent market requirement for such documents, a technical committee may decide to publish other types of normative document:

• an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in an ISO working group and is accepted for publication if it is approved by more than 50 % of the members of the parent committee casting a vote;
• an ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical committee and is accepted for publication if it is approved by 2/3 of the members of the committee casting a vote.

An ISO/PAS or ISO/TS is reviewed every three years with a view to deciding whether it can be transformed into an International Standard.

Attention is drawn to the possibility that some of the elements of this part of ISO 13475 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 13475 consists of the following parts, under the general title Acoustics — Stationary audible warning devices used outdoors:

• Part 1: Field measurements for determination of sound emission quantities
• Part 2: Precision methods for determination of sound emission quantities

Introduction

ISO 13475-1 describes field measurements. The test methods are intended to produce field test values of the sound emission level of the siren as it is installed in an outdoor situation. These field test values may, within the uncertainties, be used to control the specifications of delivered sirens, or to compare the performance of different sirens under the same conditions emitting the same signals.

ISO/TS 13475-2 describes precision measurements. This method is intended to produce generally valid specification of sirens for type tests, acceptance test or for use in the design of outdoor warning systems, etc.

In this part of ISO 13475, two types of precision measurements are discussed. They are:

• a) free-field measurements , which are applicable to measurements in an anechoic chamber or outdoors at large height;
• b) measurements in a free field over a reflecting plane , which are applicable to measurements in semi-anechoic rooms or outdoors using a flat plate with perpendicular sound incidence (free field with one reflecting plane).

In addition to the tests described in this part of ISO 13475, further tests may be relevant (e.g. tests for the influence of and resistance to cold, heat, humidity, electromagnetic fields, shock and vibration and long-term performance tests). Test methods for phenomena other than acoustic performance are not included in this part of ISO 13475.

Measurements made under optimal conditions in conformity with ISO 13475 should result in the expanded uncertainties given in Table 1.

The expanded uncertainty for actual measurement conditions, taking into account the cumulative effect of all causes of measurement uncertainty, can be found in annex B.

1 Scope

This part of ISO 13475 specifies the test conditions under which the acoustic emission levels of stationary audible warning devices may be obtained. It is applicable to sirens for use in outdoor public warning systems and sound signalling devices for use outdoors.

The purpose of this test code is to be able to produce reliable sound emission level measure­ments for stationary sirens to be used outdoors.

This part of ISO 13475 does not cover spoken messages and contains no recommendations for specific warning signals.

2 Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 13475. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO 13475 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.

3 Terms and definitions

For the purposes of this part of ISO 13475, the following terms and definitions apply.

Bibliography