Extech Instruments 407355 Manual de Instruções descarregar pdf (Página 11)

11 407355 Ver. 1.02 9/99

4. ‘AVERAGE’ MENU HEADING

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Displays the average Sound Level. Time interval can be set from 2 to 60 seconds.

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Average data can be saved to file. See below:

12. DOSIMETRY GLOSSARY OF TERMS

Criterion Level Constant sound level that, if applied for 8 hours, would

accumulate the allowable dose of 100%

Exchange Rate Number of dB required to double the allowable exposure

duration.

Threshold The sound pressure level below which measurements are

considered 0dB

Time Weighted Average The 8 hour equivalent of any dB level recorded over time.

13. CALIBRATION / REPAIR SERVICES

Extech offers complete repair and calibration services for all of the products we sell. For

periodic calibration, NIST certification or repair of any Extech product, call customer

service for details on services available. Extech recommends that calibration be performed

on an annual basis to insure calibration integrity.

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Extech Instruments 407355 Manual de Instruções Página 11