Instruments sound level meters

The sensor is the element of an instrument directly influenced by the measured quantity. In temperature measurement the thermal mass (capacity) of the sensor usually determines the meter s dynamics. The same applies to thermal anemometers. In IR analyzers used for concentration measurement, the volume of the flow cell and the sample flow rate are the critical factors. Some instruments, like sound-level meters, respond very fast, and follow the pressure changes up to several kHz. 

Sound level meter an electronic instrument for measuring RMS of sound in accordance with an accepted national or international standard. 

For the operation of sound level meters of different types the safety adviser should refer to the manufacturer s instruction book. The prime requirement for any instrument for noise measurement is that it should not be more sophisticated than necessary and it should be easy to use and calibrate. A typical sound level meter for use by the safety adviser should have the facility for measuring dBA and octave band sound pressure levels. 

Sound level meter An instrument that measures sound levels. 

Quite often, integrating measuring instruments are used in combination with sound level meters, or the necessary averaging calculations may be performed by an electronic computer. 

The simplest instrument available to measure sound levels is a sound level meter. There are four different classifications of portable sound level meters ... 

A sound level meter must be calibrated on a regular schedule if it is to provide meaningful data. Most equipment is battery operated the batteries must be fresh and capable of supplying the instrument with sufficient power. A battery check is followed by a field caUbrator check. The cahbrator produces a pure tone at a known sound pressure level, which will allow appropriate adjustments to the meter. 

Occupational Health Dynamics has a range of products and services to help you protect your employees and manage your occupational risks. Whether you are looking for a Respirator Fit Tester, a Noise Dosimeter, an Audiometer or a Sound Level Meter, we can provide you with a complete solution. We are the exclusive Distributor, Service and Calibration Center for Cirrus Research Noise Instruments in the U.S., and we can offer you a wide range of sound level meters and environmental noise products as well as the doseBadge, the Original Wireless Noise Dosimeter. 

Traditional acoustic instrumentation, such as sound level meters, detects the sound pressure using a single microphone that responds to the pressure fluctuations incident upon the microphone. Since pressure is a scalar quantity, there is no simple and accurate way that such instrumentation can determine the amount of sound energy radiated by a large source unless the source is tested in a specially built room, such as an echoic or reverberation room, or in the open air away from sound reflecting surfaces. This imposes severe limitations on the usefiilness of sound pressure levd measurements taken near large equipment that cannot be moved to special acoustic rooms. 

Since sound intensity meters can differentiate between the active and reactive sound fields, measurements of intensity taken close to noise somces can faithftiUy indicate the radiated sotmd energy. However, using a conventional sound level meter near to a noise source may indicate higher sotmd power levels than occur in the far field because these instruments cannot differentiate between active and reactive fields. 

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