CESVA DC112 - Measuring with the Dc112 D;Dc112; Prior Adjustments

DC112d/DC112
User’s manual
15
4) Access the option SETTINGS Î SENSITIVITY ADJUST.
5) The sound pressure level measured by the DC112d/DC112 will appear on the
screen, along with the time and date of the last time the sensitivity was modified.
6) Use the
and keys to adjust the value calculated (94 dB + corrections)
7) Confirm with the
key (the sensitivity will be modified, and the time and date will
be updated). If you do not want update the sensitivity then press
to return to
the DC112d/DC112 menu.
2.3 Measuring with the DC112d/DC112
The DC112d/DC112 measures the following parameters for the evaluation of noise at work:
equivalent daily exposure level (L
EX,8 h
), sound exposure (E) and noise dose (DOSE). In
addition the DC112d/DC112 facilitates the projection of these parameters to the expected
exposure time (t
p
) for measurements shorter than the exposure time. It also measures the
equivalent continuous sound pressure level with A and C frequency weightings (L
At
y L
Ct
) and
the peak level with C weighting (L
Cpeak
).
Only the DC112 carries out a frequency analysis, measuring, in real time, the equivalent
continuous sound pressure levels for the octave bands between 63 Hz and 8 kHz with A
frequency weighting.
The time history analysis shows the evolution of the equivalent continuous sound pressure
level with and without A frequency weighting for the programmable continuous integration
time (T).
2.3.1 Prior adjustments
Before beginning a measurement, the following parameters should be set:
• Criterion level (L
C
), constant exposure to this level for eight hours would result in a 100 %
noise DOSE
• Projection time (t
p
), predicted noise exposure time
• Integration time (T). Integration time for the measurement of equivalent continuous sound
pressure level. The DC112d/DC112 saves the time history for the parameters (L
Cpeak
, L
AT
,
L
CT
, and L
Toct
).
• The frequency weighting applied to the spectrum measured.