BS ISO 13475-1:1999

1 Scope
2 Normative references
3 Terms and definitions
4 Test conditions
4.1 Test site
4.2 Mounting of apparatus
4.3 Instrumentation
4.4 Microphone positions
4.5 Measurement methods
4.6 Ambient conditions
4.7 Test procedure
5 Acoustic characteristics
5.1 Test signals
5.2 Duration of the measurement
5.3 Determination of the sound emission quantities
5.4 Measurement of uncertainty
6 Information to be reported
Annex A (normative) Supply conditions
Annex B (normative) Calculation of combined expanded
uncertainty
Bibliography

Defines test conditions for obtaining the sound emission level of stationary audible warning devices in order to produce reliable sound emission level measurements for stationary sirens for outdoor warnings.

This part of ISO 13475 specifies the test conditions by which the sound emission level of stationary audible warning devices can be obtained. The methods are applicable to sirens for use in public outdoor 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 used for warning outdoors.

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