Class 1 Sound Level Meter NL-53 / Class 2 Sound Level Meter NL-43
with Extended Function Program NX-43EX Instruction Manual Operation Guide

1 Overview of This Product

• Class 2 Sound Level Meter NL-43 and Class 1 Sound Level Meter NL-53 are a class 1 sound level meter and a class 2 sound level meter that comply with the following laws and regulations related to sound level meters: the Measurement Act, IEC, JIS, and ANSI/ASA. The measurable frequency range for the NL-43 is 20 Hz to 8 kHz and for the NL-53 is 10 Hz to 20 kHz.
• This device consists of a 1/2 inch microphone, preamplifier, and main unit, and the microphone and preamplifier can be removed from the main unit and used at a distance. The main unit is equipped with operation keys and a 3.5 inch backlit color LCD display. The high visibility of the screen thanks to a large color LCD, selectable display languages, and the intuitive and simple user interface that combines key operations and touch panel operations enables the desired measurements to be taken without incorrectly configuring the necessary settings.
• The main unit’s input/output functions include an alternating current (AC) / direct current (DC) port, an RS-232C port, a USB port and, a LAN port for improving connections with communication devices.
• The main unit has IP54 dustproof and waterproof performance. By installing the optional Windscreen WS-15 or the WS-16 to the microphone, it is possible to mitigate damage caused by a small amount of rain according to IPX3 water-resistant specifications.
• As for the measurement functions, as well as sound level, equivalent continuous sound level, maximum and minimum sound levels, the device has a simultaneous measurement function for the likes of hourly sound levels and sound exposure level. The results of these measurements can be recorded on the internal memory or an SD card.
• The device has a wide linearity range of up to 113 dB, eliminating the need for switching ranges while taking measurements.
• The communication function makes it possible to control devices using commands as well as transfer and print measurement data.
• By connecting the device to a network via the LAN port, the device can be controlled and the sound listened to via a web browser on your computer or smartphone, allowing the operator to monitor and control sound levels and so on remotely (NX-43WR must be installed for audio recording).
• The device can be powered by alkaline AA batteries or Ni-MH rechargeable AA batteries, and can operate continuously for approximately 16 hours. In addition to supplying power using AC Adapter NE-21P or Battery Pack BP-21A as an external power supply, power can also be supplied using a commercially available USB charger. Batteries and an external power supply can be used together, enabling measurements over long time durations.
• The device is equipped with measurement functions such as the Auto store mode, comparator, time-weighted I (impulse), and triggered measurement. The installation of optional programs enables the addition of a waveform recording function, octave band and 1/3 octave band real-time analysis function, and/or an FFT analysis function.

Measurement function

Class 2 Sound Level Meter NL-43 / Class 1 Sound Level Meter NL-53 enables simultaneous measurement of up to four channels (Main channel, Sub1 to Sub3 channels) with selected time weighting and frequency weighting.

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Device usage environment

Place of use	Indoors or outdoors
Altitude	Up to 2,000 m
Ambient temperature	-10℃ to 50℃
Relative humidity	10% to less than 90% RH (no condensation)
Fluctuations in mains voltage	(100 V to 240 V) ±10%
Overvoltage category	Category II (AC adapter)
Use in damp locations	Not recommended
Pollution degree of surrounding environment	Pollution degree 2
Dustproof and waterproof performance	IP54 (excluding microphone)
Impact resistance	Not applicable