Instruction manual

Outline

The Sound Level Meter NL-42 and NL-52 are designed for sound level

measurements according to the IEC standard. They support diffuse sound

 eld measurements and also meets standard requirements when the supplied

windscreen is mounted.

The NL-42 and NL-52 consist of the 1/2-inch electret condenser microphone

UC-52 (for NL-42) and UC-59 (for NL-52), preampli er NH-24 (for NL-42)

and NH-25 (for NL-52), and the main unit. The preampli er can be used by

separating and extending from the main body. The unit is equipped with the

operation keys and 3-inch backlit semitransparent color TFT LCD display to

offer good visibility for indoor/outdoor use and also in a dark location.

Also, the touch panel with the display supporting English language enables

user-friendly, intuitive operation which can be operated comfortably by per-

sons who are inexperienced 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 in-

serted 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

batteries can be used to help reduce the amount of battery waste.

Connecting to an external power is also possible. And the unit can be con-

nected the external power supply for the long time measurement.