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SVAN 971 User Manual
41
Time of signal recording
The
Rec. Time
parameter
defines the time of signal recording after triggering. If
next trigger condition appears during the Recording Time, the signal will be
recorded for additional
Rec. Time
. The available values are from
1s
to
8h
, or
infinitive (
Inf
).
5.6 M
EASUREMENT RANGE SELECTION
–
R
ANGE
The
Range
position
is used for setting one of the
available measurement ranges in the instrument.
The absolute range values depend on the calibration
factor and are shown on the
Range
screen.
<ENT>
There are two ranges available:
Low
and
High
. The
detailed description of the measurement ranges
parameters is given in Appendix C.
..
The above screens were made with calibration factor
equal to zero. The calibration factor is always added to
the upper range level
– see example.
=>
5.7 S
WITCHING ON THE MICROPHONE COMPENSATION
–
C
OMPENSATION
F
ILTER
The
Comp. Filter
position is available only in the
Advanced
interface mode.
The
Microphone
filter (microphone inner noise
compensation) is switched on by default, however it is
possible to switch it off for electrical measurements (e.g.
for laboratory calibration measurements).
<ENT>
The
Dif. Field
filter enables you to set compensation for
sound measurements in the diffuse field conditions. The
microphone supplied with SVAN 971 (ACO 4052
–
38
mV/Pa, prepolarised ½” condenser microphone) is
designed for sound measurements in free field
conditions. The
Windscreen
position switches on the
compensation when windscreen is applied.
►
The
Outdoor
filters are dedicated for the permanent
outdoor monitoring application as a part of the
SV 271
monitoring station. The characteristics of the outdoor
filters depend on the application:
Environment
(the
acoustic signal is parallel t
o the microphone’s grid) or
Airport
(the acoustic signal is perpendicular to the
microphone’s grid). The frequency characteristics of the
designed filters are given in Appendix D.
►
Summary of Contents for SVAN 971
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