Contacta IL-CONTACTA-FSM Manual do utilizador - Página 4

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Background Noise Level Test
Background Noise Level Test
Background Noise Level Test
After turning the meter on it comes up in the Background Noise "A
weighted" measurement mode. The display will indicate the RMS reading
After turning the meter on it comes up in the Background Noise "A
on the first line and the MAX reading on the second line. Pressing button
After turning the meter on it comes up in the Background Noise "A
weighted" measurement mode. The display will indicate the RMS reading
"B" resets the MAX reading.
weighted" measurement mode. The display will indicate the RMS reading
on the first line and the MAX reading on the second line. Pressing button
on the first line and the MAX reading on the second line. Pressing button
"B" resets the MAX reading.
"B" resets the MAX reading.
How to test for background noise:
How to test for background noise:
When testing a new building for background noise, turn on all lights, fans,
How to test for background noise:
sound system and other electrical equipment which is normally on when
When testing a new building for background noise, turn on all lights, fans,
the building is in use. The loop system has usually not been installed yet.
When testing a new building for background noise, turn on all lights, fans,
sound system and other electrical equipment which is normally on when
however if you are certifying an installation this test is done without the
sound system and other electrical equipment which is normally on when
the building is in use. The loop system has usually not been installed yet.
hearing loop system turned on.
the building is in use. The loop system has usually not been installed yet.
however if you are certifying an installation this test is done without the
however if you are certifying an installation this test is done without the
hearing loop system turned on.
hearing loop system turned on.
Walk throughout the seating area where the loop system will be used,
holding the meter in a vertical position at the listening plane height. The
Walk throughout the seating area where the loop system will be used,
important reading will be the MAX reading. However, it is important to
Walk throughout the seating area where the loop system will be used,
holding the meter in a vertical position at the listening plane height. The
watch the RMS reading. If the MAX reading exceeds –32dBA (readings
holding the meter in a vertical position at the listening plane height. The
important reading will be the MAX reading. However, it is important to
above –32dBA will have a lower negative number, for example –30dBA
important reading will be the MAX reading. However, it is important to
watch the RMS reading. If the MAX reading exceeds –32dBA (readings
means there is more background noise than –35dBA), you will need to
watch the RMS reading. If the MAX reading exceeds –32dBA (readings
above –32dBA will have a lower negative number, for example –30dBA
document the areas where those higher noise levels are found.
above –32dBA will have a lower negative number, for example –30dBA
means there is more background noise than –35dBA), you will need to
means there is more background noise than –35dBA), you will need to
document the areas where those higher noise levels are found.
document the areas where those higher noise levels are found.
IEC 60118-4 Notes and Requirements
IEC 60118-4 Notes and Requirements
The standard as revised in 2004 notes that any background noise level
IEC 60118-4 Notes and Requirements
lower than –47dBA will result in a excellent signal to noise ratio,
The standard as revised in 2004 notes that any background noise level
however levels below –32dBA are acceptable and do meet the
The standard as revised in 2004 notes that any background noise level
lower than –47dBA will result in a excellent signal to noise ratio,
requirements of the standard. If the background noise level is above
lower than –47dBA will result in a excellent signal to noise ratio,
however levels below –32dBA are acceptable and do meet the
–32dBA, then the building management should be notified and the
however levels below –32dBA are acceptable and do meet the
requirements of the standard. If the background noise level is above
source of the interference found and repaired.
requirements of the standard. If the background noise level is above
–32dBA, then the building management should be notified and the
–32dBA, then the building management should be notified and the
source of the interference found and repaired.
source of the interference found and repaired.
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