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Whether you are testing for OSHA compliance, quieting equipment, or monitoring the roar of a stadium crowd, B&K Precision's Sound Level Meters can get the job done. The model 735 Sound Level Meter provides 30~130 dB capability in three convenient measurement ranges Low, Med and Hi with an accuracy of 1.5 dB. The meter meets the IEC 651 Type II and includes frequency weighting A & C and fast and slow time weighting. Two auxiliary ports provide either AC output, 1Vrms full scale, or DC output, 10mV /dB. With the model 735, B&K Precision can meet all your sound testing needs.

This sound level meter meets IEC Type 2 requirements and offers high accuracy for critical measurements. The R8060 features over/under range indicators for each of the 3 measurement ranges, a digital analog bargraph and the ability to keep track of Min/Max readings.

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A dB scale needs a reference to call 0 dB. When the root-mean-squared average of its input is 1, env~ arbitrarily calls that 100 dB, so if you connect an osc~ directly to env~, you will see 97 dB, because the RMS level of a sinusoid is 3 dB down from the peak amplitude. Your SLM should use an RMS level of 20 microPascals as 0 dB, so a 94 dB sound has an RMS of 1 Pascal.

Measure the same sound with your SLM and with env~. Then figure out what value you need to add or subtract from the env~ value to make it equal to the SLM. This should work for sounds that are similar, but note that your SLM probably applies a frequency weighting (A or C) to the sound before computing the RMS, so if you try to measure sound with very different frequency content, your env~ and SLM measurements will still have discrepancies.

Many factors could cause these differences: mic frequency responses, polar patterns, and noise floors; integration times for RMS averages, and whether the SLM is reporting average or peak levels; possible compression or distortion in your signal chain.

A sound level meter is used for acoustic measurements. The word "acoustic" means "sound that travels through air". This is opposed to the word "audio", a term that is also often used in the field of sound measurement. "Audio" refers to sound that travels electronically through cables and audio components. That having being said, let's get back to acoustic measurements.

A sound level meter needs a microphone to measure the changes in air pressure produced by the sound source. The better quality the microphone, the more accurate the measurements will be. Such measurement microphones are categorized as Class 1 or Class 2. For many applications a Class 2 microphone, which is slightly less accurate and less pricey than a Class 1 microphone, is more than sufficient. Class 1 microphones are usually only required when the law prescribes. Whichever microphone you use, it is important for accuracy that the microphone is correctly calibrated.

The single value measured by a sound level meter is referred to as the "broadband value" as it uses all values across the audio frequency bands (20 Hz to 20 kHz) to calculate the level. It is typically measured in decibels (dB), which is a logarithmic unit. This means, for example, that doubling the sound level would correspond to a 10 dB higher measurement value.

The spectrum of frequencies provided by an RTA measurement suits tasks such as optimization of sound systems and rooms. An RTA typically measures with a resolution of 1/1 or 1/3 octave. To conceptualize this, one can think of a piano. 1/1 gives us a single measurement value for each octave (12 semi-tones), 1/3 provides a single value for groups of 4 semi-tones, 1/6 represents 2 semi-tones, while 1/12 is a separate level measurement for every key on the piano.

A sound level meter can be used for measuring sound or noise* for Community Noise Analysis, Building Acoustics, Industrial Noise Control, Machinery Noise Analysis, and further applications.

* the definition of "noise" is simply "unwanted sound"; one person's sound may be another person's noise

This type 2 sound level meter meets ANSI and IEC 651 Type 2 standards. Ideal for noise surveys in the workplace, installing fire alarms and speaker systems and enforcing noise ordinances. Measures from 35 to 130dB in 2-ranges with accuracy of plus or minus 1.5dB. Data hold and Max hold functions. Backlit display allows use in dimly lit areas. Complete with microphone wind screen and 9V battery.

The NSRT_mk4 is a wireless sound level meter datalogger with a dust-protected type 1 digital MEMS microphone, an accurate date/time clock, a non-volatile 128 Mb recording memory and wireless connectivity with fast USB and WiFi download.

Running on battery, it can record sound pressure levels for a week. Connected to an external USB charger it can record for months. Its very small size allows it to be attached to or embedded within the monitored equipment.

Quest SoundPro SE-DL Series Sound Level Meters come in a variety of models to meet your sound measurement needs. Several models feature octave band analysis, giving you the ability to conduct environmental noise monitoring and noise control evaluation.

Quest SoundPro SE-DL Series Sound Level Meters and Real-Time Analyzers help provide advanced sound level monitoring and comprehensive data analysis. Instruments are available in Class/Type 1 and Class/Type 2 models. A large screen display allows for real-time frequency analysis and data-storing capabilities make it easy to post-process and evaluate workplace noise levels. Quest SoundPro SE-DL Series Sound Level Meters are an excellent solution for a variety of applications, including:

The CEL-63x Series of sound level meters are the most versatile of meters available; ideal for both noise at work applications (ISO9612, OSHA) and environmental measurements (BS4142). Ensure compliance with workplace noise legislation with the CEL-633 and to assist with the selection of hearing protection.

The CEL-633 is an easy to use instrument designed to undertake the measurement requirements of the workplace and environmental noise. It also complies with the latest IEC and ANSI international standards for sound level meters. Just switch on the instrument, auto-calibrate and start measuring with one of the predefined views. Regardless of the view selected, all data is measured and stored simultaneously so no mistakes can be made.

By implementing the latest digital technology, the meter has a single measurement range so no range adjustment is required, ensuring the highest levels of performance with all noise sources. Models are available for both environmental and/or occupational noise with the availability of frequency analysis and advanced functions such as data markers, timers, and logging of time-history data. Even with such advanced functionality, the CEL-630 Series remains very simple to use.

If the instrument is used for unattended measurements, audio recording can be triggered by a condition such as a given level being exceeded for a period of time. In this case, additional data will be collected along with the audio. This can be especially useful where the noise source of interest is transient. The Type 1 microphone can be changed out.

Measurements of sound level meters are according to standards IEC 61672, IEC 60651/ 60804, BS 7580, ANSI S1 4, and ANSI S1.43. Initial calibrations on new sound level meters Types 2250, 2250 Light and 2270 will be performed according to IEC 61672. This applies for calibration according to accreditation bodies DANAK and ENAC.

The LA-7200 Sound Level Meter conforms to various international and domestic standards and is designed to be easily connected to a PC. An SD memory card and USB connector are provided as standard to meet the growing requirements for computer processing of measurement data captured to the LA-7200. Data can be easily read by simply connecting the sound level meter to a Windows based PC, without the need for special software. 110 dB Linearity RangeSingle, Dual or Quad Mode Measurement1/1 Octave Real-Time Analysis Function (Standard)Large Screen with Touch Keys for Easy OperationUSB and RS-232C InterfaceSupports SD / SDHC Cards

The idea was so intriguing that in 2014, the NIOSH hearing loss team evaluated 192 sound measurement applications (apps) for the iOS and Android platforms to examine their suitability and accuracy in relation to professional sound measurement instruments (Kardous and Shaw, 2014). Of the 192 apps the team examined, 10 iOS apps met the outlined criteria for functionality, features, and calibration capability, and of those, 4 iOS apps met our testing criteria. Read more about that study in the blog So How Accurate Are These Smartphone Sound Measurement Apps?

Realizing that most of the apps on the market are oriented at the casual user and lack the accuracy and functionality necessary to conduct occupational noise measurements, NIOSH hearing loss researchers collaborated with an app developer, EA LAB, to create an iOS based sound level meter app that measures and characterizes occupational noise exposure similar to professional instruments.

The app was subjected to the same testing requirements that were established in the NIOSH laboratory study.[1] It met the testing criteria ( 2 dB mean difference from the reference type 1 sound level meter). In our most recent study on the accuracy of apps when used with external calibrated microphones, the 4 apps from our original study achieved closer agreement (within 1 dB) of the reference type 1 sound level meter (Kardous and Shaw 2016). The NIOSH SLM app, when used with an external calibrated microphone, measured sound levels within 1 dB of the reference SLM over the testing range of 65 -95 dB SPL in our laboratory. While the app is not meant to replace a professional sound level meter or a noise dosimeter or be used for compliance purposes, we recommend that those interested in making proper noise measurements use an external microphone that can be calibrated with an acoustical calibrator for improved accuracy (Roberts et al. 2016). ff782bc1db