In addition, a type approval was also granted in austria, switzerland and hungary. The current standard for sound level meters, iec 61672, is published in three parts. The extent of the tests in this part of iec 61672 is deliberately restricted to the minimum considered necessary for periodic tests. This part of iec 61672 gives electroacoustical performance specifications for three kinds of sound measuring instruments. This standard contains the german version of the european standard en 616721. In an ideal situation, the instrument would meet the centre point or design goal of these criteria exactly and every sound level meter would measure exactly the same. Iec 60942, class 1 compliant sound calibrator for 1inch. Until now, it seems that no iec 61672 1 conformity has. The iec 616721 specifies three kinds of sound measuring instruments.
For the purposes of this document, the terms and definitions given in iec 616061, as well as the following, apply. Integrating sound level meter class 1 according to iec. Microphone locations for evaluation shall be on a line from the source location to. To satisfy most regulations, new meters should meet the standard iec 61672 or the british standard equivalent bs en 61672 to either class 1 or class 2. This indian standard part 1 which is identical with iec 616721 2002. Internal oscillation system, 1 khz sine wave generator. Iec 60651 sound level meters withdrawn, replaced by iec 61672 1. Iec 616721, electroacoustics sound level meters part 1. Periodic tests described in this part of iec 61672 apply to sound level meters for which the model has been, or has not been, pattern approved by an independent testing organization responsible for pattern approvals and in accordance with the test procedures of iec 616722. This standard specifies two levels of performance, class 1 and class 2, with class 1 being effectively more accurate. If appropriate, the configuration of the complete sound. For unattended measurements, the direction from the source.
This second edition of iec 61672 3 describes procedures for periodic testing of timeweighting, integratingaveraging, and integrating sound level meters that were designed to conform to the class 1 or class 2 specifications of the second edition of iec 61672 1. Specifications 3 terms, definitions and abbreviated terms. For a complete system, a suitable microphone compatible with ansi s1. Part 1 provided a response to these advances and incorporated specifications considered necessary to ensure consistency across the measurement. Output signal ac output ac 750 mvrms corresponding to each range step. For example, iec 341 is now referred to as iec 600341. Power supply 006p dc 9v battery heavy duty type accuracy frequency weighting meet iec 61672 or dc 9v adapter input. Patternevaluation tests apply for each channel of a multichannel sound level meter, as necessary. Refer to iec 616721 jis c 15091 frequency response tab. Due to its intelligent software concept and its measuring range of 110 db without switching to another range, tango is very easy to use despite its high func.
A sound level meter is used for acoustic measurements. It is economically impossible to verify the whole iec 61672 1 standard requirements one each item of an computerized data acquisition systems model. Sl4022 your purchase of this sound level meter marks a step forward for you into the field of precision measurement. The tango plus sound level meter is a compact class 1 sound level meter according to iec 61672 with 11 and octave analyser for workplace and environmental protection applications. The current international standard that specifies sound level meter functionality and performances is the iec 61672 1. The topoftherange testo 8161 sound level meter complies with all requirements with regard to the execution of nonconform noise level measurements according to iec 61672 1 class 2 and ansi s1. The text of document 29812fdis, future edition 2 of iec 616721, prepared by. Iec 60657 nonionizing radiation hazards in the frequency range from 10 mhz to 300 000 mhz. A class 1 sound calibrator is primarily intended for use with a class 1 sound level meter and a class 2 sound calibrator primarily with a class 2 sound level meter, as specified in iec 61672 1. Acoustic and vibration standards compliance ansi, iec. Calibration build in external calibration vr, easy to calibrate on 94 db level by screw driver.
In addition, it does not contain requirements necessary for conformance to. This makes it suitable for carrying out noise level measurements in the workplace as well as in public places, industry and production. Accuracy frequency weighting meet iec 61672 type 2, calibrating input signal on 94 db31. Iec 61672 1 uses different criteria than were used for the 2002 first edition. Consolidated editions the iec is now publishing consolidated versions of its publications. The objective of this standard is to provide details of the tests necessary to verify conformance to all mandatory specifications given in as iec 61672. Iec 61672, class 1 sound level meter trig instruments. Iec 61672 class 2, economical type sound level meter model. There are other standards for the calibrator, for noise dosimeters, personal sound exposure meters, octave band filters and so on. The tolerance limits for class ls sound calibrators are based on the use of a laboratory standard microphone, as specified in iec 610941, for. The sm50 and sm90 feature speech intelligibility measurement functions. Periodic tests described in this edition of iec 61672 3 apply to sound level meters for which the manufacturer claims conformance to the specifications of the second edition of iec 61672. When used with the sinus soundbook, the system is type approved according to iec 61672 1 and iec 61260 by the ptb german metrology authority and can thus be calibration to highest standards and legal requirements.
Iec 61672 a standard for sound level meters explained. Our noise meters comply to iec 6065160804 61672 class 1 and are suitable for legal use. Iec 61672 electroacoustics sound level meters iec 61674 medical electrical equipment dosimeters with ionization chambers andor semiconductor detectors as used in xray diagnostic imaging iec 61675 radionuclide imaging devices characteristics and test conditions. Iec 60942, class 1 compliant sound calibrator for 1inch and 12inch microphones nc74 the nc74 is a sound calibrator conforming to iec 60942, class 1 requirements, suitable for calibrating highprecision sound pressure level meters. The sm30 does not include any of the modules related to speech intelligibility. List of international electrotechnical commission standards. The differences between class 1 and class 2 sound meters. Differences between class 1 and class 2 sound meters sound meter classes. This part of iec 61672 provides details of the tests necessary to verify conformance to all mandatory specifications given in iec 616721 for timeweighting sound level meters, integratingaveragin g sound level meters, and integrating sound level meters. These are described, as follows, in the occupational safety and health osha technical manual ted015, chapter 5, osha noise and hearing. The acceptance limits for class ls sound calibrators are based on the use of a laboratory standard microphone, as specified in iec 610941, for.
Although this meter is a complex and delicate instrument, its durable structure will allow many years of use if proper operating techniques are developed. The table below lists all of the functions and modules modules and features sm30 sm50 sm90 speech intelligibility. Here our explanation of iec 61672 and what these parts mean for sound level meters. It can measure also 11 and octaves according to iec 61260. Iec 616722 electroacoustics sound level meters part. This technical guide, which was based on drafts of iec 61672 part 3, has been prepared by a subgroup of the united kingdom accreditation services acoustical industry technical committee, in response to requests for an interim document to be made available. This makes it suitable for carrying out noise level measurements in the workplace, public places, industry and production. Sound level meters are commonly used in noise pollution studies for the quantification of different kinds of noise, especially for industrial, environmental, mining and aircraft noise. At a corner of a parallelepiped measurement surface, the microphone shall be oriented so that the reference direction of the microphone as specified in iec 61672 1 points towards the origin of the reference box shown by point o in figure 1. The meters can be used indoor as well as outdoor and measures all noise parameters, octave spectral data and support audio streaming. In the period from 1961 to 1985, international standards for sound level meters did not provide any requirements or recommendations to account for the uncertainty of measurement. Specifications in this standard for the response to sound waves apply without an operator present in the sound field.
A class 1 sound level meter is a noise measurement instrument that meets the requirements of iec 616721. However, the reading from a sound level meter does not correlate well to humanperceived loudness, which is better measured by a loudness meter. International test and compliance standards including iec standards at advanced test equipment rentals. Download pdf iso iec 616721 eletroacoustics sound level. Frequency and time weighting meet iec 61672, class 1. The current international standard that specifies sound level meter functionality and performances is the iec 616721. The first part, part 1, details the performance characteristics that a class 1 or class 2 sound level meter should have. International standard 616721 has been prepared by iec technical committee 29, iec electroacoustics, in cooperation with the international organization of legal metrology oiml.
This second edition cancels and replaces the first edition published in 2002. Iso iec 61672 1 eletroacoustics sound level meters. Comparative study of the performance of smartphonebased. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to.
Difference between a class 1 and class 2 sound level meter. The meter also stores its measurement data as well as the audio internally, so its data is never lost. Iec 60654 industrialprocess measurement and control equipment operating conditions. As from 1 january 1997 all iec publications are issued with a designation in the 60000 series. Iec 61672 class 2, economical type sound level meter. The filters used meet the requirements for a class 1 instrument specified in iec 61260. Used the durable, longlasting components, including a strong, light weight absplastic housing case. Iec 61672 a standard for sound level meters explained the current standard for sound level meters, iec 61672, is published in three parts. Download iso iec 616721 eletroacoustics sound level meters.
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