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133
SVAN 979 User Manual
5. Select the
Averaging
type:
Manual
or
Auto
.
Manual averaging means that you may
perform as many measurements for the
measurement point as you heed, and
you will decide when to stop series of
measurements
by
using
the
<Completed>
soft-key
–
see
►
Automatic averaging assumes that the measurements will be averaged according to IEC 60268-16:2011
which assumes two averaging procedures
– for standard measurements (
IEC 60268-16x2
) and for
measurements with fluctuating noise (
IEC 60268x3
). In the standard name abbreviation
x2
means that no
less than two measurements should be made, and
x3
means that no less than three measurements should
be made. When the automatic averaging is selected, additional position
Standard
appears in the
STIPA Settings
screen.
6. In case of automatic averaging, choose
the
Standard
that defines the averaging
type:
IEC 60268-16x2
or
IEC 60268x3
.
In the automatic averaging mode,
you
make measurements the same way as in
the manual mode. The difference is that
in automatic mode, the instrument
decides when to end the series of
measurements and ends it automatically
when the appropriate condition is met.
►
7. The
Index
position allows you to define
which index
STI
or
CIS
will be displayed
in the main STIPA views.
►
8. In the
Source Calibration
position, set the adjustment of the reference
STIPA signal level to the level of a real voice signal in the tested area.
LAeq of both signals must be measured and if the difference between the
real signal and STIPA signal is different than -3 dB, enter it as the Source
calibration.
14.4.5
Considering ambient noise distortions
During the measurement, the effect of ambient noise distortions can be considered in combination with the
STIPA signal in the 1/1-octave bands with central frequencies from 125 to 8000 Hz. These sound pressure
values are not necessarily should be the result of some measurements. They can be defined on the basis of
the user's knowledge, design assumptions, literature, etc.
In the
Ambient noise
screen, you can set
noise levels for octave bands that will be
considered in STIPA calculations.
<ENT>
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