Svantek SVAN 979, Руководство пользователя

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SVAN 979 User Manual
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Area summary view - main STIPA view that presents summary results for the current area:
o
Averaged STI (or CIS) index with consideration of the Ambient
noise distortions.
o
σ
- standard deviation of measured STI indexes for the tested area.
o
Min
–
minimal STI value.
o
LAeq
– averaged LAeq for the area.
o
Number of measurement points taken into consideration for the
summary results calculations.
o
Conformity of measurements with the standard: Yes or No .
•
Point view - main STIPA view. The Point view allows you to see the modulation function, to delete
measurements (only for the last measurement point) and exclude measurement results from the
calculation of the averaged STI index. This view corresponds with the measurement point selected in the
Area view. This view presents a list of measurements for the measurement point with following results:
o
Averaged STI (or CIS) index with consideration of the Ambient
noise distortions ( Avg. ) and STI spread (
Δ
) for the measurement
point.
o
STI (or CIS ) index with consideration of the Ambient noise
distortions, the STI qualification band and error indication for
individual measurements (
#1 , #2 ..).
o
LAeq and LCeq for the selected measurement.
•
Modulation function view corresponds with the measurement selected in the Point view. Modulation
function presents LZeq and modulation transfer ratios ( m(f1), m(f2) ) for seven octave bands with central
frequency from 125 Hz up to 8 kHz:
In case the modulation ratios are greater than 1 due to errors or
disruptions detected during the measurement, they are given a value
of 1, and the results for this band are highlighted in red.
Note:
You can switch between above screens with the ▼/▲ key pressed together with <Alt>.
•
Measurement view appears when you start a new measurement (manually or automatically). This view
presents measured results which are updated every second and a progress bar of the measurement that
lasts 15 seconds.
o
STI index with consideration of the Ambient noise ( Noise added )
or without ( Measured ) and the STI qualification band.
o
LAeq and LAS for the current measurement time.
After completion of the measurement, the instrument will automatically switch to the Point view and the
measurement results will be placed in the measurement list. If you stop the measurement manually, the
instrument switches to the
Point view, but the measurement result will not be included in the measurement list
(see Chapter 14.4.6 ).
Note: Averaged CIS is displayed instead of STI in the main STIPA views (Area, Area summary and
Point) when this parameter is selected as Index in the STIPA Settings screen .