Chauvin Arnoux Multimetrix SL 105 Manual De Instrucciones página 12

English
Functional Description (cont'd)
Checking noise
levels ...
Permissible noise
exposure
(Extracted from U.S.
Department of Labor
Noise Regulations)
Checking room
acoustics ...
Note
12
This chart, gathered from Federal, state, and local agencies, shows
standards for just how much noise is acceptable.
Sound Level (dB)
(A- Weighting,
SLOW response)
Noise is inevitable in almost any environment. Depending on the level and
duration, noise can be a minor irritant, a definite disturbance, or even a
threat to your hearing.
To check noise levels with you meter, set A / C button to A and
FAST / SLOW button to SLOW.
Take measurements at several points in the test area, with the meter
positioned properly.
The size, shape and furnishings of a room can have a tremendous effect
on a home theater system's performance.
A "hard" room with bare surfaces tends to exaggerate treble response,
sometimes giving the music a strident quality.
A "soft" room with curtains, over-stuffed furniture, carpet, etc. might
reduce high-frequency response so the bass sounds dominant, giving you
a "mushy" sound.
Waves might also develop in the room, giving your system a "peaky",
eccentric response.
•
The first step in solving this problem is to analyze the room's acoustics
with your meter and a suitable test recording. The test recording
should produce pure tones, one at a time, at intervals spanning the
audio spectrum. Make a graph or table showing the sound levels
generated by the individual tones. This gives you a clear idea of the
frequency response of your "total system" --home theater equipment
and room included.
•
The next step is to smooth out the response. Adjusting tone controls
and varying speaker placement might improve the sound significantly.
But, to approximate the ideal "flat response," you could add a
frequency equalizer to your home theater system.
If A / C button is set to C, the meter's frequency response is flat from 32 to
10,000 Hz ( ± 3 dB). Above 10 kHz, the frequency response of the meter
drops off rapidly. Be sure to consider this when you use a test recording that
includes tones at the extreme high end of the audio spectrum.
Maximum Duration
Per Day(hours)
90
92
95
97
100
102
105
110
1
115 /
4
8
6
4
3
2
1
1 /
2
1
1
/
2
or less
Sound Level Meter