sauter SW 1000 Instruction Manual page 47

sponse. The A and C weightings are used more often and defined in IEC and GB/T
standards. The B weighting is only defined in ANSI standard. The D weighting re-
fers to an international standard that is already invalidated. The D weighting is only
available in some old devices. No frequency response (the so-called flat response)
is always defined as Z response, flat response or linear response.
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 Time constant
: Exponential time function for a certain time constant, which cor-
rects the square of sound level value. The acoustic pressure correction is higher if
it better corresponds to the current time, and vice versa. The most popular time
constants are "Fast" and "Slow". Do not use the "Pulse" option, it is only available
for historical purposes.
 SPL: Sound pressure level (SPL), calculated by the sound level meter, is the
maximum level of sound weighted according to the time constant, measured in one
second.
1
 LEQ
: Average sound level value or an equivalent constant level of sound during
measurement. The value equal to 10 common logarithms from the ratio of the
square of average sound pressure signal time, weighted according to the fre-
quency response at a specific time interval, to the square of LEQ reference value,
constitutes the current value of integrating the sound level during the given period
of measurement. The longer the integration time, the slower the LEQ change. The
LEQ parameter is often used for comprehensive assessment of noise load.
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 Peak
: Peak value of sound level. The value equal to 10 common logarithms from
the ratio of the square of maximum sound pressure level, weighted according to
the frequency response, to the square of reference value. Generally, this value is
used to assess very short sound pulses.
1
 E
: Noise load (sound exposure level). The integral of the time of sound pressure
level signal square, weighted according to the frequency response, at a defined
time interval or an event with a defined duration of measurement. This value is al-
ways used to assess the impact of noise on people.
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 SEL
: Noise load (sound exposure level). The value of 10 common logarithms from
the ratio of noise load to reference value. It is sometimes called "single event
level".
 LN: Statistical result of analysis (statistical level). The noise level exceeded in N%
of measurement period.
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 Max
: Maximum time of weighted sound level at a given measurement period.
 Min: Minimum time of weighted sound level at a given measurement period.
 SD: Standard deviation of sound level, weighted according to the time constant, at
a given measurement period. The SD parameter is used to define the degree of
changes in sound level broadcasting.
Hint 1: Further details are provided in the definitions contained in IEC 61672.1:2013.
SW-BA-e-1710 47