6 Events coding _ BE_PM
6.1 Principle
In a great majority of acoustic investigations, it is desirable to perform a tracking of specific events in direct connection with the noise
environment.
It can be performed a posteriori when reading the file on a computer, but also during the measurement by pressing directly the keypad
of the sound level meter.
The normal way to code an event is mainly based on viewing, recognition, listening, measurement of associated levels....
So you code the source if you see it, hear it and identify it or if the sound level meter shows a global or frequency level in dB or via the
time evolution on the LCD screen.
In other circumstances, unforeseeable events disrupts the measurement, such as a door slamming or more simply a measurement
stop because of an unexpected press on the keypad.
So the DB300 sound level meter allows you to:
•
to visualize in real time
the time evolution
or
the
frequency division
(noise spectrum) of the elementary equivalent
continuous levels (short Leq)
•
to
code
the specific events
with the keypad or to mark an unexpected specific event
PM
•
to delete retrospectively a disruptive part of the measurement (Back-Erase – BE – function).
6.2 Affected measurement modes
These functions do not affect all the measurement modes of DB300 instrument.
•
Events coding:
These two additional functions are only accessible with the following modes:
Integrating-averaging sound level meter – A and C weighted and analyzer by octave bands filters 16 Hz to 16 kHz (class 1)
or from 31.5 Hz to 8 kHz (class 2)
Integrating-averaging sound level meter – A and C weighted and analyzer by third octave bands filters from 12.5 Hz to 20
kHz (class 1) or from 25 Hz to 10 kHz (class 2) _ (
option)
.
•
Particular marking: PM
This simple tracking of sources without distinction affects:
Integrating-averaging sound level meter – A and C weighted and analyzer by octave bands filters 16 Hz to 16 kHz (class 1)
or from 31.5 Hz to 8 kHz (class 2)
Integrating-averaging sound level meter – A and C weighted and analyzer by third octave bands filters from 12.5 Hz to 20
kHz (class 1) or from 25 Hz to 10 kHz (class 2) _ (
option)
.
Integrating-averaging sound level meter – A and C weighted
•
BE_ Back-Erase
Useful for a measurement without possibility of further processing to eliminate in situ some disrupting events. It affects the following
mode:
Conventional sound level meter and averaging-integrating with storage of the global results
19
Events coding _ BE_PM
