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57
SVAN 979 User Manual
4.5 S
ETTING SPECTRA
–
S
PECTRUM
The
Spectrum
position appears in the
Measurement
list when the
1/1 Octave
,
1/3 Octave
,
1/6 Octave
,
1/12 Octave
or
FFT
function is selected in the
Measurement Function
list (
path: <Menu> / Function / Measurement Function
)
and
4.6 S
ELECTING MICROPHONE COMPENSATION
–
C
OMPENSATION
F
ILTER
The
Compensation Filter
position
is
available only in the Sound meter
modes. It
allows you to select the appropriate
compensation filter for different measurement
situations.
The
Compensation Filter
screen comprise a
list of options (
Off
,
Free Field
,
Diffuse Field
,
SA279 (90
o
)
,
SA279 (0
o
)
)
and
the
Windscreen
position that should be set.
<ENT>
The microphone inner noise and thermal compensation is switched on by default, however it is possible and
necessary to switch it off (
Off
) for electrical measurements (e.g. laboratory calibration measurements).
The
Free Field
and
Diffuse Field
filters are intended to compensate sound measurements in the free field or
diffuse field conditions. `The microphone supplied with
SVAN 979
(GRAS 40AE) is designed for sound
measurements in the free field conditions. The
Free Field
option means that the correction filter for the diffuse
field conditions is switched off. In case of sound measurements performed with the use of different specific
diffuse field response microphone types, the
Diffuse Field
option should never be used and the microphone
inner noise and thermal compensation should be turned off (
Off
option).
SA279 (90
o
)
and
SA279 (0
o
)
compensations are dedicated for the permanent outdoor monitoring applications
with the use of the
SA 279
outdoor microphone outdoor kit (usually when SVAN 979 is working as a part of the
SV 279 monitoring station). The characteristics of the outdoor filters depend on the dominating sound incidence
angle: environmental monitoring (incidence angle 90 deg) or airport monitoring (incidence angle 0 deg).
Windscreen
filter can be switch
Off
,
On
or set to automatic detection
–
Auto
.
Note: When using windscreen SA22 the Windscreen compensation
must be On during windy conditions to maintain good tolerances
margin of the SVAN 979 frequency response.
Note: For the free filed evaluation with the SA 279 microphone
outdoor kit the SA279(90
o
) or SA279(0
o
) compensation must be
selected.
Содержание SVAN 979
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