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DS/EN ISO 4869-1 - Acoustics – Hearing protectors – Part 1: Subjective method for the measurement of sound attenuation (ISO 4869-1:2018)
November 26, 2018 - DS

This document specifies a subjective method for measuring sound attenuation of hearing protectors at the threshold of hearing. The method is a laboratory method designed to yield reproducible values under controlled measurement conditions. The values reflect the attenuating characteristics of the...

ISO 4869-1 - Acoustics - Hearing protectors - Part 1: Subjective method for the measurement of sound attenuation
October 1, 2018 - ISO

This document specifies a subjective method for measuring sound attenuation of hearing protectors at the threshold of hearing. The method is a laboratory method designed to yield reproducible values under controlled measurement conditions. The values reflect the attenuating characteristics of the...

ASTM F1334 - Standard Test Method for Determining A-Weighted Sound Power Level of Vacuum Cleaners
October 1, 2018 - ASTM

This test method calculates the overall A-weighted sound power level emitted by small portable upright, canister, combination vacuum cleaners, backpack vacuum cleaners, hard-floor cleaning machines, extractors, and central vacuum cleaner motorized nozzles intended for operation in domestic and...

Combination of Levels in dB
December 1, 2017 - ESDU

Methods are provided to deal with the combination of sound pressure levels in decibels. Firstly, for the case when several sources are acting together a method of addition is given to estimate the combined sound pressure level in dB from all the sources. Secondly, for the measurement of...

ATIS 0600005 - Acoustic Measurement
December 1, 2017 - ATIS

Executive Summary This standard identifies sound power as the preferred method of measuring the emission of acoustic noise from telecommunications equipment. The main focus is to use sound power to gain repeatability and accuracy over sound pressure methods. This standard will also provide the...

ISO 9296 - Acoustics - Declared noise emission values of information technology and telecommunications equipment
August 1, 2017 - ISO

This document is applicable to information technology and telecommunications equipment. It specifies: a) for a batch of equipment, the method for determining the following values: - the declared mean A-weighted sound power level, LWA,m; - the declared mean A-weighted emission sound pressure level,...

ISO 7029 - Acoustics - Statistical distribution of hearing thresholds related to age and gender
January 1, 2017 - ISO

This document provides descriptive statistics of the hearing threshold deviation for populations of otologically normal persons of various ages under monaural earphone listening conditions. It specifies the following, for populations within the age limits from 18 years to 80 years for the range of...

ECMA 109 - Declared Noise Emission Values of Information Technology and Telecommunications Equipment
December 1, 2016 - ECMA

This Ecma Standard applies to information technology and telecommunications equipment. This Ecma Standard specifies: the method for determining the mean A-weighted sound power level, LWA,m for a batch of machines, the method for determining the mean A-weighted emission sound pressure level, LpA,m...

ITU-R V.574 - Use of the decibel and the neper in telecommunications
August 1, 2015 - ITU-R

This text recommends the symbols to be used for the logarithmic expression of quantities referring to power, and provides examples of the use as well as the relationship between the decibel and the neper.

HIGH FREQUENCY TECHNIQUES An Introduction to RF and Microwave Engineering
August 1, 2016 - WILEY

This textbook provides a fundamental approach to RF and microwave engineering. It is unusual for the thoroughness with which these areas are presented. The effect is that the reader comes away with a deep insight not only of the design formulation but answers to how and why those formulations work....

DS/ISO 1996-1 - Acoustics - Description, measurement and assessment of environmental noise - Part 1: Basic quantities and assessment procedures
March 21, 2016 - DS

ISO 1996-1:2016 defines the basic quantities to be used for the description of noise in community environments and describes basic assessment procedures. It also specifies methods to assess environmental noise and gives guidance on predicting the potential annoyance response of a community to...

ISO 1996-1 - Acoustics - Description, measurement and assessment of environmental noise - Part 1: Basic quantities and assessment procedures
March 1, 2016 - ISO

This part of ISO 1996 defines the basic quantities to be used for the description of noise in community environments and describes basic assessment procedures. It also specifies methods to assess environmental noise and gives guidance on predicting the potential annoyance response of a community to...

ITU-T G.100.1 - The use of the decibel and of relative levels in speechband telecommunications
June 1, 2015 - ITU-T

In transmission engineering, most often it would be rather impractical to characterize the magnitude of signals directly by a numerical value in volts or watts. Instead, a logarithmic measure is used, expressed in "dB", to characterize the signal magnitude in relation to some chosen reference value...

MIL-STD-202-308 - TEST METHOD STANDARD METHOD 308, CURRENT-NOISE TEST FOR FIXED RESISTORS
April 18, 2015 - NPFC

Purpose. This resistor noise test method is performed for the purpose of establishing the "noisiness" or "noise quality" of a resistor in order to determine its suitability for use in electronic circuits having critical noise requirements. This method is intended as a standard reference for the...

SAE J671 - Vibration Damping Materials and Underbody Coatings
June 1, 2014 - SAE

Description of Material-The materials classified under this specification are: a. Mastic vibration damping materials used to reduce the sound emanating from metal panels. b. Mastic underbody coatings used to give protection and some vibration damping to motor vehicle underbodies, fenders, and other...

ANSI/ASA S1.26 - American National Standard Methods for Calculation of the Absorption of Sound by the Atmosphere
January 1, 2014 - ASA

This Standard specifies an analytical method to calculate the attenuation of sound as a result of atmospheric absorption for a variety of meteorological conditions when the sound from any moderateamplitude source propagates through the atmosphere. The calculation method of the Standard applies for...

ASTM F2544 - Standard Test Method for Determining A-Weighted Sound Power Level of Central Vacuum Power Units
November 1, 2011 - ASTM

This test method calculates the overall A-weighted sound power level emitted by central vacuum power units, intended for operation in domestic applications. This standard applies to the power unit only at the power unit location. To test the sound power level of a central vacuum at the user's...

Electronic Warfare Pocket Guide
January 1, 2011 - IET

This book discusses EW definitions and subareas; antennas; radio propagation; receiver sensitivity; communication jamming; communications electronic protection; jamming LPI communications; radar characteristics; radar electronic protection; expendable countermeasures; decoys; decibels; graph...

ANSI/ASA S12.10 PART 2 - American National Standard Acoustics - Measurement of Airborne Noise Emitted by Information Technology and Telecommunications Equipment - Part 2: Declaration of Noise Emission Levels
January 1, 2011 - ASA

This Standard applies to information technology and telecommunications equipment. This Standard specifies: - the method of determining the declared noise emission values of a batch of machines, - acoustical and product information to be given in technical documents supplied to users by the...

Pocket Radar Guide: Key facts, equations, and data
January 1, 2010 - IET

The book covers the following topics about radar concept; frequency; antennas; transmitters; receivers and signal processor; waveforms; radar cross-section; radar equation; detection and search; measurement and tracking; clutter; atmosphere, rain and ionosphere; decibels (dB), and list of...

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