HD2010UC
- 88 -
V4.2
record at intervals equal to the set integration time (MENU >> Instrument >> Measurements
>> Integration interval) the data displayed on SLM screen.
Set in this way and once the integration time has been reached, the sound level meter will first
record data, then set all integrated levels to zero, and finally start a new integration period. The
flashing REC symbol, overlapping the status indicator, shows that the sound level meter is re-
cording. Press START to start recording and STOP to stop it. A flashing REC over the RUN
status indicator, shows when the sound level meter is recording. Press REC with the instrument
in STOP to disable the Auto-Store and the multiple integration modes. The Auto-Store record-
ing mode combined with the single integration mode (MENU >> Instrument >> Measurement
>> Integration Mode: SINGLE) allows to record automatically data displayed on SLM,
OCTAVE and T.OCTAVE (with option) screens at the end of the set integration interval
(MENU >> Instrument >> Measurements >> Integration Interval); the measurement will be au-
tomatically interrupted immediately after recording.
3.
Single screen
storage is obtained by pressing REC for at least 2 seconds when the instrument is
in RUN or STOP mode. If the instrument is in STOP mode, and the “Advanced Data Logger”
option is installed, you will be prompted to choose between automatic (AUTO) and manual
(MAN) storage; the current screen will be stored if choosing the latter.
The
Continuous Recording
allows recording the time profile of instantaneous and integrated
levels. This means that you can record, for example, the sound pressure level with FAST time con-
stant 8 times a second and, at the same time, the sound pressure levels with SLOW time constant,
the peak level, and the Leq over 0.5s twice a second.
The Auto-Store recording mode, combined with the multiple integration mode, allows instead
to store sound levels at prefixed intervals, resetting them automatically at the beginning of each in-
terval. Thus you can record, for example, the Leq, the SEL, the maximum sound pressure level with
SLOW time constant, at intervals programmable between 1s and 99 hours.
M
EASUREMENT OF
N
OISE
D
OSE
The
Dose
represents the percentage of a maximum value of noise exposure throughout a day.
dt
T
Q
D
T
q
L
L
c
c
∫
−
⋅
=
0
10
100
)
(
where:
D(Q) = exposure percentage for an Exchange Rate equal to Q.
T
c
= daily exposure time (usually 8 hours).
T
= measurement time.
L
= sound pressure level when it is higher than the Threshold Level, and -
∞
otherwise.
L
c
= Criterion Level for a daily exposure corresponding to 100% of the dose.
Q
= Exchange Rate.
q
= parameter independent of the exchange rate and equal to:
•
10
for Q = 3dB
•
5/log2 for Q = 5dB
•
4/log2 for Q = 4dB
Summary of Contents for DeltaOHM HD2010UC
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