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Electroacoustics. Instruments for the measurement of sound intensity. Electromagnetic and electrostatic compatibility requirements and test procedures Ingestion-build-63114 fixing screws1 Scope 1. 1 This Technical Specification specifies requirements for instruments that measure sound intensity using pairs of pressure sensing microphones with respect to their immunity to power and radio frequency fields and to electrostatic discharge, and the permitted radio frequency emissions, together with test procedures to verify conformance. Sound intensity measuring instruments are available in many different configurations and may be powered