IEC 60651 PDF

Buy IEC Ed. Sound level meters from SAI Global. Find the most up-to-date version of IEC at Engineering A sound level meter is used for acoustic measurements. It is commonly a hand- held instrument .. Both of these were replaced by IEC , later renamed IEC , while the linear integrating meters were initially described by IEC , later.

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Defence Research and Development Canada. Most national regulations also call for the absolute peak value to be measured to protect workers hearing against sudden large pressure peaks, using either ‘C’ or ‘Z’ frequency weighting.

Most measurement regulations will state the standards that should be met by the equipment. Type 1, Type 2.

This applies to both the sound level meter itself as well as the 6051 calibrator. This section gives electroacoustical performance specification for three types of sound measuring instruments.

The procedures are described in detail with the goal of ensuring all laboratories are consistent in their testing. Using this information, the instrument is able to accurately convert the electrical signal back to a sound pressure, and display the resulting sound pressure level decibels dB SPL. A noise dosimeter American or noise dosemeter British is a specialized sound 606511 meter intended specifically to measure the noise exposure of a person integrated over a period of time; usually to comply with Health and Safety regulations such as the Occupational Safety and Health OSHA 29 CFR The A-frequency curve was based on the historical equal-loudness contours and while arguably A-frequency-weighting is no longer the ideal frequency weighting on purely scientific grounds, it is nonetheless the legally required standard for almost all such measurements and has the huge practical advantage that old data can be compared with new measurements.

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Sound Level Meter Standards

This information was correct as of Ifc measure L AT an integrating-averaging meter is needed; this in concept takes the sound exposure, divides it by time and then takes the logarithm of the result. With hearing protection on, a soldier is less likely to be aware of his or her movements, alerting the enemy to their presence. Graphs of Fast, Slow and Impulse time weightings applied so that sound levels measured are easier to read on a sound level meter.

Short L eq is a feature of most commercial integrating sound level meters—although some manufacturers give it many different 60561. If a manufacturer cannot show at least one model in his range that has such approval, it is reasonable to be wary, but the cost of this approval militates against any manufacturer having all his range approved. While applying double hearing protection helps prevent auditory damage, it may compromise effectiveness by isolating the user from his or her environment.

The IEC specifies “three kinds of sound measuring instruments”. By using this site, you agree to the Terms of Use and Privacy Policy.

Sound level meter – Wikipedia

Electroacoustics – Sound Calibrators Defines the performance and accuracy of sound level calibrators. To ensure accuracy in periodic testing, procedures should be carried out by a facility that can produce results traceable to International Laboratory Accreditation Cooperationor other local International Laboratory Accreditation Cooperation signatories. If the LAeq is plotted as the equivalent from the beginning of the graph to each of the measurement points, the plot is shown in the second graph.

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Advances towards the assessment of hearing damage”. 66051

Sound exposure level—in decibels—is not much used in industrial noise measurement. Instruments are available that measure 1 or all three types of measurement In addition to the type 606651 meter, the standard also lists two performance categories Class 1 and Class 2. Root-mean-square sound pressure being obtained with a standard frequency weighting and standard time weighting.

Very similar to IEC Types 0, 1, and 2. The reference pressure is set by International agreement to be 20 micropascals for airborne sound.

The main thing you should be aware of is that the most iev standards for sound level meters are BS EN However, the reading from a sound level meter does not correlate well to human-perceived loudness, which is better measured by a loudness meter.

The classic exponential meter was originally described in IEC for ‘industrial’ meters followed by IEC for ‘precision’ meters. This makes it unlikely that a sound level meter designed to the older and standards will meet the requirements of IEC S is appropriate when measuring a signal that fluctuates a lot.

Retrieved 3 July The diaphragm of the microphone responds to changes in air pressure caused by sound waves.