Rion NL-42A, Instruction Manual, Page: 19 / 154

1
Outline
The Sound Level Meter NL-42A and NL-52A are designed for sound level
measurements according to the IEC standard. They support diffuse sound
fi eld measurements and also meets standard requirements when the supplied
windscreen is mounted.
The NL-42A and NL-52A consist of the 1/2-inch electret condenser micro-
phone UC-52 (for NL-42A) and UC-59 (for NL-52A), preamplifi er NH-24
(for NL-42A) and NH-25 (for NL-52A), and the main unit. The preamplifi er
can be used by separating and extending from the main body. The unit is
equipped with the operation keys and 2.8-inch backlit semitransparent color
TFT LCD display to offer good visibility for indoor/outdoor use and also in
a dark location.
The display supports various languages, and enables user-friendly, intuitive
operation which can be operated comfortably by persons who are inexperi-
enced in measurements.
The unit is equipped with AC OUT and DC OUT connector, I/O connector
and USB connector as the output connectors.
Since the main unit offers the “water and dust resistant performance” equivalent
to IP54 (except microphone unit), outdoor measurements can be performed
without undue worries and a risk of failure caused by a sudden rain can be
reduced.
The 113 dB wide linearity range enables measurement without switching ranges.
Measurement results data are stored on the internal memory or inserted SD
memory card of the unit.
The unit is designed for power saving, so operates continuously for up to 24 hours
on four size AA batteries.
Also, in consideration of environment, nickel metal hydride rechargeable bat-
teries can be used to help reduce the amount of battery waste.
Connecting to an external power is also possible. And the unit can be connected
the external power supply for the long time measurement.