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Noise type
Tick Periodic impulse noise audible when within 2ft of source
vibe
extraneous humming sound at fundamental caused by vibration. Often from a
low level grille or panel vibration
buzz low
level
low level buzz heard within 5ft and not audible with music as not heard during a
"fast" sweep
ring
harmonic ring heard within 5ft and not audible with music as not heard during a
"fast" sweep
buzz audible buzz with steady state sine tone but not with music.
Noise level
low level
low level sounds heard within 5ft and not audible during a "fast" sweep. Likely
not audible with music
- audible within 5ft and not audible during a "fast" sweep or music
loud approximately the same level or louder than the fundamental, easily heard.
Signal type
slow sweep
standard 4 sec up and 4 sec down sweep with operator allowed to zero in any
potential noise
fast sweep 1.5 sec up/down sweep on decade oscillator
music test
not audible within x meters. from any location around speaker when using
music source
portable 1m
installed 2m
engineered sound (array) 3m
TEST PROCEDURES
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