8 Glossary
1:1 Octave Band Filters A division of the frequency range into bands, the upper frequency
limit of each band being twice the lower frequency limit.
1:3 Octave Band Filters Single 1:1 Octave bands divided into three parts.
A Weighting A standard weighting of the audible frequencies designed to
reflect the response of the human ear to noise.
Acoustic Calibrator An instrument that provides a reference noise source that is used
to calibrate and check the performance of a Sound Level Meter.
Broadband Noise Measurements using parameters which include all the
audible noise, such as dB(A) and dB(C)
C Weighting A standard weighting of the audible frequencies used for the
measurement of Peak Sound Pressure level.
CE Marking A label used to show that the Sound Level Meter conforms to the
specification of a European Directive
dB(A) Decibels A weighted
dB(C) Decibels C Weighted
dB(Z) Decibels Z weighted
Decibel (dB) The units of sound level and noise exposure measurement
DIN 45641 German Standard which defines the additional measurements
L
AFTeq
& L
IeqT
Fast Time Weighting A standard time weighting applied by the Sound Level Meter
IEC 60651:1979 The International Standard for Sound Level Meters
IEC 60804:1984 The International Standard for Integrating & Integrating-
Averaging Sound Level Meters
IEC 61260:1995 The International Standard for 1:1 Octave & 1:3 Octave Band
Filters
IEC 61672-1:2003 The International standard for Sound Level Meter and Integrating
Averaging Sound Level Meters that replaces both IEC 60651 and
IEC 60804
Impulse Time Weighting A standard time weighting applied by the Sound Level Meter
Integrating Averaging
Sound Level Meter
A Sound Level Meter which accumulates the total sound energy
over a measurement period and calculates an average
L
A10.0
The noise level exceeded for 10% of the measurement period
with ‘A’ frequency weighting calculated by statistical analysis
L
A90.0
The noise level exceeded for 90% of the measurement period
with ‘A’ frequency weighting calculated by statistical analysis
L
AE
Sound Exposure Level (SEL) with ‘A’ frequency weighting
L
Aeq,t
Equivalent continuous sound pressure level. A measure of the
average sound pressure level during a period of time, t, in dB
with ‘A’ weighting.
L
AF
Sound level with ‘A’ Frequency weighting and Fast Time weighting
L
AFmax
The maximum Sound level with ‘A’ Frequency weighting and Fast
Time weighting
L
AFmin
The minimum Sound level with ‘A’ Frequency weighting and Fast
Time weighting
L
AFTeq
Takt maximal sound level as defined by DIN 45641
L
AI
Sound level with ‘A’ Frequency weighting and Impulse Time
weighting
L
AImax
The maximum Sound level with ‘A’ Frequency weighting and
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