
2
Outline
Communication with a computer is possible via the built-in I/O connector
and USB connector. Because the USB connector conforms to storage spec-
ifi cations, the unit will be recognized as a removable disk when connected
to a computer. This allows transfer of data from the SD memory card to the
computer without having to remove the SD memory card from the unit.
The RS-232C interface allows sending measurement data to a printer.
Various optional programs allow users to add the following functions: long-
time, continuous data recording to SD memory card, waveform recording,
and comparator output. Also, various measurements are supported including
octave and 1/3 octave band real-time analyses, FFT analysis, and additional
measurements such as time weighting I (impulse).
In addition to the measurements of sound level, equivalent continuous sound
level and maximum/minimum sound level, the unit can measure percentile
sound level and sound exposure level. Up to 1000 measurement results can
be stored in the main unit.
The NL-42A/NL-52A allows the following quantity measurements.
Main processing
Simultaneous measurement of all items with selected time weighting (F,
S) and frequency weighting (A, C, Z) characteristics
Instantaneous sound pressure level
L
p
Equivalent continuous sound pressure level
L
eq
Sound exposure level
L
E
Maximum sound pressure level
L
max
Minimum sound pressure level
L
min
Percentile sound level
L
N1
,
L
N2
,
L
N3
,
L
N4
(1 to 99, 1-increment steps)
L
N5
(0.1 to 99.9, 0.1-increment
steps)
Содержание NL-42A
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