6.3 BE – Back-Erase
6.3.1
Principle
This function is active only during a measurement, it allows to remove in real time acoustic values produced from events that have just
happened.
Typically, a door slamming, conversations, an unexpected event or falling objects that change the measurement.
When you perform a measurement in storage mode, it is easy to remove or modify a posteriori these areas with the software. Here, it
is not possible in a start/stop mode without storage. So, it's in this mode that the function is of particular importance.
It is also possible to activate it automatically at the end of the manual measurement to remove the potential finger noises on the
keypad when stopping it
(cf page 13).
In mode without storage
:
Once you activate the
BE
key, the duration of the measurement in progress is reduced by 5 s or 10 s (according to the initial
configuration) and the corresponding acoustic energy.
Example
:
BE duration = 10s _ Measurement configured for a T duration of 60 s _
BE
after 25 s of measurement
•
the chronometer goes from 25 s to 15 s
•
Leq values are refreshed in real time
•
the chronometer keeps going until 60 s
•
the total measurement lasts 70 s for an effective measurement of 60 s.
Note:
for a duration of measurement in progress lower than the BE duration, the chronometer restarts from 0 to reach the duration
initially configured.
➢
Action:
•
Press
OK
to activate the instantaneous
BE
mode according to disruptions and according to the principle described above.
Important
: when the configuration always includes a
BE
at the end of the measurement, the BE is activated only when the
measurement has been manually stopped with the keypad (Start/Stop mode with free T duration).
In case of automatic stop linked to a fixed duration (30 s for example), the BE function is not activated because, a priori, you don't have
to touch the keypad
6.4 Events coding
The analysis a posteriori of the noise environment file often needs to collect information in situ. Indeed, the recognition of noisy sources
or emerging sources makes easier the creation of the final report.
The sound level meter has a specific function called
“Events coding”
. It allows to detect noise sources or specific events at the same
time of short Leq acoustic data.
Events coding _ BE_PM
20
Control screen before launching the
measurement
First screen
S1
after launching the
measurement
The
BE
function appears.
