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Sound Level Meter

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Hi,

May i know what is meant by TYPE 1 sound level meter?

Depends on your location and the standards of accuracy the instrument is compared to:

ANSI Standards

Sound level meters used by OSHA meet the American National Standards Institute (ANSI) Standard S1.4-1971 (R1976) or S1.4-1983, "Specifications for Sound Level Meters." These ANSI standards set performance and accuracy tolerances according to three levels of precision: Types 0, 1, and 2. Type 0 is used in laboratories, Type 1 is used for precision measurements in the field, and Type 2 is used for general-purpose measurements.

* For compliance purposes, readings with an ANSI Type 2 sound level meter and dosimeter are considered to have an accuracy of ±2 dBA, while a Type 1 instrument has an an accuracy of ±1 dBA.
* A Type 2 meter is the minimum requirement by OSHA for noise measurements, and is usually sufficient for general purpose noise surveys.
o The Type 1 meter is preferred for the design of cost-effective noise controls.
o For unusual measurement situations, refer to the manufacturer's instructions and appropriate ANSI standards for guidance in interpreting instrument accuracy.

So based on ANSI specifications the Type determines the instrument uncertainty.

The quote was taken from here.

Ron
 
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