5. Select the Averaging type: Manual or
Auto.
Manual averaging means that you may
perform as many measurements for the
measurement point as you need, and
you will decide when to stop series of
measurements by using the
<Completed> soft-key – see
Chapter
13.4.6.
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 the 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.
13.4.5 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 the STIPA calculations.
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