BS 7676-1:1993

Committees responsible
National foreword
Introduction
Method
1 Scope
2 Normative references
3 Definitions
4 Instrumentation
5 Test conditions
6 Procedure for obtaining sound pressure level data
7 Determination of A-weighted sound power level
8 Evaluation of octave and one-third-octave sound
     power
9 Test report
Annexes
A (normative) Procedures for calculating A-weighted
     sound pressure or power levels from octave or
     one-third-octave band spectra
B (normative) Practicable measurement applications
C (normative) Determination of the environmental
     correction K2 for acoustic reaction in a test room
     with the aid of a reference sound source
D (informative) Bibliography
Tables
1 Measurement-surface quantity, Ls
2 Correction values, K1, for background noise
3 Environmental correction factor, K2
4 Standard deviations of the measurement uncertainty
A.1 Octave band data
A.2 One-third-octave band data
Figures
1 Example of machinery mounted on the floor or by a
     wall
2 Measurement-point arrangement for figure 1
3 Example of machinery mounted on the floor or near
     to a wall
4 Measurement-point arrangement for figure 3
5 Example of machinery mounted in a pit with hard
     sound-reflecting walls
6 Measurement-point arrangement for figure 5
7 Example of machinery mounted at considerable
     distance from a sound-reflecting surface
8 Surface-measurement-point arrangement for figure 7

Specifies the conditions under which sound emitted from gear units is determined in order to establish a common procedure for comparison. Applies to all power transmission gearing other than gears for fine mechanisms. Includes definitions, annexes, tables and diagrams.