Vingtor Stentofon 1021001100, Installation & User Manual

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A100K11209 v.1.4
VSS-V2 Technical Manual
7 Installation performance test
7.1 General
The system shall indicate approximate direction of incoming sound
signals to determine at least whether the sound signal being detected
is forward or abaft the beam and from which side it is being detected
from. For the VSS-V2 resolution of direction detection is eight (8). The
system is tested according to ISO 14859:2012 . For a performance test
at installation site as the following test procedure is recommended.
7.2 Test set up
A test signal is needed to make performance test. As test signal, a true
typhoon or whistle can be used, a handheld/mobile aircompressed horn
or even a speaker can be used. This test is to be performed for eight (8)
different angles to verify that all directions are correctly indicated and
that vessels obstacles and reflections have no influence on direction
detection.
Note: In full scale testing resolution and physical direction can be difficult
to decide.
Test signal:
● Test signal source must resemble actual horn signal as much as
possible. For best performances use signals rich in harmonics such
as a square or triangle signal.
● The fundamental frequency of the signal shall lie within the range 70-
820 Hz.
● Test signal must be set to generate a minimum sound pressure level,
SPL, of 75dB(A) measured at center of the microphone unit.
● The test signal shall be a 3 second long test tone. Best testing is with
a minimum signal separation of ten (10) seconds between tests and
different angles.
Move test signal source or the microphone unit (read: vessel) under test
throughtout 360 degrees to reach all LED directions. Distance between
signal source and vessel is not limited as long as above conditions are
met