48
SVANTEK 977W User Manual
5.5
Setting the 1/1 Octave and 1/3 Octave spectra
– Spectrum
The
Spectrum
position appears in the
Measurement
list when the
1/1 Octave
or
1/3 Octave
function is selected in the
Measurement Function
list (
path:
<Menu> / Function / Measurement Function / 1/1 Octave or 1/3 Octave
). See
section 10 for more details.
5.6
Selection of the microphone compensation filters
– Compensation Filter
The
Compensation Filter
position
is
available only in case of the
Sound Meter
modes. It enables the user to select the
appropriate
frequency
response
compensation filter and the additional
windscreen filter.
<ENT>
The
Compensation Filter
window consists of a list with 6 positions:
Off
,
Free Field
,
Diffuse Field
,
Outdoor Environment
,
Outdoor Airport
and
Windscreen
. The position in the sub-list is changed after pressing
the
▲ or ▼ push-buttons. To switch the filter on the user should mark it, by means of the ◄ or ► push-buttons
and to confirm the selection with the
<ENTER>
push-button. Pressing
<ENTER>
push-button closes the sub-list.
After pressing the
<ESC>
push-button the sub-list is also closed but any changes will be ignored.
The
Free Field
and
Diffuse Field
filters enable the user to set compensation for sound measurements in the
free field conditions or in the diffuse field conditions. The microphone supplied with the
SVAN 977W
instrument
(SV 7052) is designed for sound measurements in 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 specific diffuse field microphone types the option
Diffuse Field
should never be used and the
compensation filter should be turned off.
Outdoor Environment
and
Outdoor Airport
filters are dedicated for the permanent outdoor monitoring
application. The characteristics of the outdoor filters depend on the application: environmental (the acoustic
signal is parallel to the microphone’s grid) or airport (the acoustic signal is perpendicular to the microphone’s
grid). The frequency characteristic of the designed filters is given in App. D.
Windscreen
filter can be switch
Off
,
On
or set to automatic detection
–
Auto
.
5.7
Setting the measurement range
– Range
The
Range
position
is used to set one of the
available measurement ranges in the
instrument.
The absolute range value changes due to the
calibration factor and are shown on the
screen.
<ENT>
