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Extremely user friendly !
Rion's NL-52 and NL-42
sound level meters provide full support
for the measurement process.
Sound Level Meter Class1 NL-52 Sound Level Meter Class2 NL-42
The NL-52 and NL-42 were developed to
eliminate the trouble of reading instruction manuals
when conducting measurements.
Large and easily viewable three-inch LCD color display.
The unit (except for the microphone) is water-resistant,
which means that it is unaffected by sudden rain showers.
You can use rechargeable batteries to help cut down on waste,
making this an environmentally friendly product.

Sound Level Meter
Class1
NL-52
Sound Level Meter
Class2
NL-42
Features
Large color LCD screen
Three-inch LCD screen with a touch panel. High resolution screen is easy to see indoors or outdoors and even in the dark.
Three-inch LCD screen with a touch panel Variety of I/O Connections
No paper manual is needed.
User instructions and a help function can be easily accessed on the device.
NL-52_NL-42 Measurement Display (Level-Time graph) NL-52_NL-42 Measurement Display (Simultaneous display of Main and Sub channel) NL-52_NL-42 Parameter Screen
Measurement Display
(Level-Time graph)
Measurement Display
(Simultaneous display of Main and
Sub channel)
Parameter Screen
NL-52_NL-42 Menu screen NL-52_NL-42 Help screen
Menu screen
Help screen
Water-resistant (Except for the microphone)
Use of rechargeable batteries
Guaranteed water-resistant to at least level IP54 (resistant to spraying water).
Helps reduce failures caused by sudden rain showers.

Waterproof NL-52_NL-42
* Mounting the All-weather windscreen or rainproof windscreen helps raise the water-resistant performance of the entire unit,so that the microphone will meet IPX3 specifications.
In these new models it is possible to use rechargeable batteries which make these meters environmentally-friendly.
24 hour continuous measurement is possible
(when using eneloop® or dry alkaline batteries).rechargeable batteries NL-52_NL-42
・ Please use the dedicated charger to charged eneloop® batteries.
・ When using eneloop batteries, please read the eneloop® battery
  instruction manual.
・ eneloop® is a registered trademark of Panasonic group.
Continuous detailed measurements for one month
This meter can be used to conduct long-term measurements, such as environmental measurements. (If an AC adapter is used)
Continuous detailed measurements
Example of detailed recording
If the Lp is measured at 100 ms intervals and the Leq is simultaneously measured at 10 min intervals
over a 24 h period, the total size of accumulated data is approximately 74 MB (reference value)
Functionality can be extended by a range of options
Additional functions can be added, such as simultaneous logging of raw data (100 ms Lp) and processed data(Leq and other indices), frequency analysis reverberation time measurement and long-term data recording.
1-3 octave band analysis screen Analysis screen (x40)
1/3 octave band analysis screen
FFT analysis screen(x40)
frequency analysis function(PC) NL-52_NL-42
Data management screen of AS-60 software
Optional program function list
Optional program function list
When the optional programs are installed, the following functions are added:
Extended function program
NX-42EX
SD-CARD NX-42EX
The NX-42EX is supplied on the 512 MB SD card.
The 512 MB SD card can be used as a memory card after installing the program.
Prepares for other programs
When NX-42EX is installed*, NX-42WR, NX-42RT, NX-42RV and NX-42FT can be added.
NX-42EX NL-52_NL-42
NX-42EX
Auto store function
(instantaneous value, processed value)
Comparator function
Continuous data output function
+
Program type
Additional function
NX-42WR NX-42RT NX-42FT NX-42RV
Real sound monitor
(waveform recording)
circle


Octave, 1/3 octave band
analysis

circle

Octave, 1/3 octave band
filter output

circle

FFT analysis


circle
Reverberation Time
Measurement



circle
*The NX-42EX program cannot be uninstalled.
Auto store function
This function enables continuous measurement in Lp mode (instantaneous SPL) and Leq mode (equivalent continuous SPL)
to be conducted simultaneously.
Total measuring time of Auto store function
Up to 1 000 h  Equipped with a timer function
Lp mode (instantaneous SPL) and Leq mode (equivalent continuous SPL) concept
Lp mode and Leq mode NL-52_NL-42
Comparator function
This function turns on when the open collector output exceeds the set value (max. applied voltage 24 V, max. current 60 mA, allowable dissipation 300 mW).
Comparator function NL-52_NL-42
Continuous data output function
This function enables the continuous acquisition of instantaneous values and processed values during both USB and RS-232C communication.
This is a convenient function for users who can design their own control programs, where data has to be transferred continuously from the sound level meter to the computer.
Waveform recording program
NX-42WR
SD-CARD NX-42WR
The NX-42WR is supplied on the 2 GB SD card.
The 2 GB SD card can be used as a memory card after installing the program.
This function enables users to record sounds and
to process sound levels simultaneously.
Recorded data can be played on computer and used for frequency analysis.
(Uncompressed waveform WAVE file)
Sampling at 48 kHz, 24 kHz, 12 kHz, Selection of 24 bit or 16 bit
Maximum recording time (16 bit)
Memory card
Sampling frequency
512 MB 2 GB
48 kHz 1 h 4 h
24 kHz 2 h 8 h
12 kHz 4 h 16 h
Octave, 1/3 octave real-time analysis program
NX-42RT
SD-CARD NX-42RT
The NX-42RT is supplied on the 512 MB SD card.
The 512 MB SD card can be used as a memory card after installing the program.
By adding the NX-42RT program to the NL-52/NL-42, octave band and 1/3 octave band analysis can be performed. Saved analysis results can be loaded and shown in an overlay graph display together with current analysis data. NC curve graph display and NC value calculation/display are also possible. Using the AS-60RT software, data can be utilized and managed on a computer.
NX-42RT 1-3 octave band analysis screen NX-42RT Overlay analysis screen NX-42RT NC curve screen
1/3 octave band analysis screen
Overlay analysis screen
NC curve screen
NX-42RT Partial over all screen NX-42RT Measurement screen (Level-Time graph)
Partial over all screen
Measurement screen (Level-Time graph)
Reverberation Time Measurement Program
NX-42RV
SD-CARD NX-42RV
The NX-42RV is supplied on the 512 MB SD card.
The 512 MB SD card can be used as a memory card after installing the program.
By adding the NX-42RV program to the NL-52/42, reverberation time measurements can be performed. The measurement method is the interrupted noise method.This program allows storage of reverberation time decay curves, T20/T30 calculation,Txx calculation (reverberation time calculation based on a user-defined interval) and averaged reverberation time results displayed on the SLM screen.
NX-42RV Measuring screen (graph) NX-42RV Measuring screen (numeric) NX-42RV Reverberation time decay curve screenNX-42RV Result screen (T20/T30/Txx)
Measuring screen (graph)
Measuring screen (numeric)
Reverberation time decay curve screen
Result screen (T20/T30/Txx)
FFT analysis program
NX-42FT
SD-CARD NX-42FT
The NX-42FT is supplied on the 512 MB SD card.
The 512 MB SD card can be used as a memory card after installing the program.
By adding the NX-42FT program to the NL-52/NL-42, FFT analysis can be performed.The analysis frequency range is 20 kHz, with 8 000 spectrum lines (200 displayed).Saved analysis results can be loaded and shown in an overlay graph display together with current analysis data. Maximum zoom ratio is x40, and the top list screen can show up to 20 lines.
NX-42FT Analysis screen (x1) NX-42FT Analysis screen (x40) NX-42FT Overlay analysis screen
Analysis screen (x1)
Analysis screen (x40)
Overlay analysis screen
NX-42FT Linear average screen NX-42FT Top list screen
Linear average screen
Top list screen
Back to top
 
System construction
System construction
NL-52_NL-42 System construction
Back to top
 
Peripheral devices
Peripheral devices
All-weather
Rain-protection
Sound calibrator
Tripod
windscreen WS-15
WS-15
This windscreen is designed for outdoor installations. It helps to reduce wind noise and is equipped with rainproof features that satisfy the IPX3 water-resistant specifications. It is used with a microphone extension cable.
(Mounting adapter WS15006 required separately)
windscreen WS-16
WS-16
This screen protects the microphone against rain for a short period of time.The rainproof performance of this windscreen is designed to satisfy the IPX3 water-resistant specifications.
NC-74
WS-16
This Sound calibrator conforms to IEC 60942 (JIS C 1515), Class 1, providing a level of performance sufficient for calibrating the precision sound level meter.
 
Specifications
Nominal acoustic pressure
level
94 dB
Nominal frequency 1 kHz
This stand can be used for general acoustic measurements. The sound level meter and microphone can be mounted on the stand.
ST-80
 
ST-81
(For All-weather windscreen WS-15, use of ST-81 is recommended.)
Waveform analysis software
AS-70
This software allows you to load stored WAVE files from a RION sound level meter, vibration meter or data recorder. Octave, 1/3 octave, and FFT analyses can then be performed. Playback of the real sound files is also possible.
Frequency analysis screen
Frequency analysis screen
Frequency analysis screen
Frequency analysis screen
Specifications
Waveform analysis Calculations Maximum value, Minimum value, Average value, RMS, Variance, Differential and integral calculus, HPF, LPF
Frequency weighting Z, A, C, G, C to A, Lv (vertical) (JIS C 1510), Lv (horizontal) (JIS C 1510)
FFT analysis Analysis points 32 to 65 536 points
Display data Power spectrum, Power spectral density, Spectrogram
Time weighting 10 ms, F, 630 ms, S, 10 s
Octave band analysis Applicable standards IEC 61260 Class 1 (JIS C 1514 Class 1)
Analysis frequency range Octave band 0.5 Hz to 16 kHz (16 bands)
1/3 octave band 0.4 Hz to 20 kHz (48 bands)
Recommended operating environment
CPU Intel Core™2 Duo 2 GHz or higher
RAM 2 GB or more
(4 GB recommended)
HDD 20 GB free or more
(100 GB or more recommended)
DISPLAY XGA (1 024 × 768) or more
OS Microsoft Windows XP Professional 32 bit,
7 Professional 32 bit / 64 bit,
8 Pro 32 bit/64 bit
Complete software for environmental measurements
Data management software for environmental measurement AS-60
Data management software for environmental measurement AS-60 enables the graph display of measurement data, arithmetic processing, excluded sound processing, preparation of reports, output of files, and playback of real sound files.
  • Easy to use
  • Reports easy to prepare

  • Simultaneous display
    of multiple data items  
    (up to 8 data items)
  • Data stored in a data recorder
    can be loaded
    (CSV file for DA-40 Viewer)
  • Data combination



AS-60 Data management screen
Data management screen
AS-60 Report preparation screen
Report preparation screen
Recommended computer specifications
(Common for AS-60/60RT/60VM)
CPU Intel Core™2 Duo 2.0 GHz or higher
RAM 2 GB or more
DISPLAY XGA (1024 x 768 pixels) or more,
at least 65 536 colors
OS Microsoft Windows XP Professional 32 bit,
7 Professional 32 bit and 64 bit
* If AS-60/60RT/60VM is used for NL-52/42 data,
the NX-42EX is also needed.
Supported models
  • NL-62 *
  • NL-52/42 *
  • NL-32/31/22/21 *
  • DA-40Viewer
* Only auto store data are supported.
Data management software for environmental measurement AS-60RT
(Includes the octave and 1/3 octave data management software)
Adds support for handling octave band analysis data to AS-60
AS-60RT is for managing NX-62RT/42RT or NA-28 data on a computer.

AS-60 Data management screen
Data management screen
Supported models
  • NX-62RT *
  • NX-42RT *
  • NA-28 *
* Only auto store data are supported.
Data management software for environmental measurement AS-60VM
(Includes the vibration level data management software)
Adds support for handling data measured with VM-53A to AS-60
Supported models
  • VM-53A*
* Only auto store data are supported.
Types of Measurement
Types of Measurement
Environment Vehicles Other industries
  • Specified construction work noise
  • Specified factory noise
  • Road traffic noise (General road, highway)
  • Aircraft noise
  • Railway noise (inc. bullet trains)
  • Occupational health noise
  • Work environment noise
  • School health environmental noise
  • Car interior noise (idling car)
  • Car exterior and interior noise (moving car)
  • Nearby exhaust sound
  • Tracking analysis of gear transmission
  • Computer acoustic power level measurement
  • Computer component (HDD / Fan) sound level
  • Home electronics sound rating ( home appliance sound evaluation)
  • Water heater noise
  • Construction machine, acoustic power level measurement
  • Vessel interior noise
  • Building acoustics (habitability /NC curve /sound pressure levels between rooms/evaluation of sound insulation /reverberation time measurement)
  • Measurement of silencer effect
  • Sound insulation measurement
Specifications
Specifications

NL-52 NL-42
Applicable standards IEC 61672-1: 2002 Class 1
ANSI S1.4-1983 Type 1
ANSI S1.4A-1985 Type 1
ANSI S1.43-1997 Type 1
JIS C 1509-1: 2005 Class 1
IEC 61672-1: 2002 Class 2
ANSI S1.4-1983 Type 2
ANSI S1.4A-1985 Type 2
ANSI S1.43-1997 Type 2
JIS C 1509-1: 2005 Class 2
CE Marking (EMC Directive 2004/108/EC, Low Voltage Directive 2006/95/EC),
WEEE Directives, Chinese RoHS (export model for China only)
Measurement functions Simultaneous measurement of the following items, with selected time weighting and frequency weighting

Processing (main ch) Instantaneous sound pressure level: Lp
Equivalent continuous sound pressure level: Leq
Sound exposure level: LE
Maximum sound pressure level: Lmax
Minimum sound pressure level: Lmin
Percentile sound levels: LN (0.1 to 99.9 %, 0.1-increment steps, max. 5 values)
Processing (sub ch) Instantaneous sound pressure level: Lp
Additional processing In addition to main processing items, one of the following can be selected for simultaneous processing:
C-weighted equivalent continuous sound level: LCeq
C-weighted peak sound level: LCpeak
Z-weighted peak sound level: LZpeak
エ-time-weighted equivalent continuous sound level: LAIeq*2
Maximum エ-time-weighted equivalent continuous sound level: LAImax*2
The power average of the maximum level of each 5 second interval: LAtm5
The frequency weighting for the additional processing synchronizes with the frequency weighting of the sub-channel, so when the sub-channel has A-weighting, LAtm5 can be selected.
When C-weighting (Z-weighting ) is selected, the additional processing LCeq and LCpeak (LZpeak) are selectable.
Microphone Type UC-59 UC-52
Sensitivity level -27 dB -33 dB
Measurement range A-weighting: 25 dB to 138 dB
C-weighting: 33 dB to 138 dB
Z-weighting: 38 dB to 138 dB
C-weighting peak sound level: 55 dB to 141 dB
Z-weighting peak sound level: 60 dB to 141 dB
Inherent noise A-weighting 17 dB or less 19 dB or less
C-weighting 25 dB or less 27 dB or less
Z-weighting 30 dB or less 32 dB or less
Frequency range 20 Hz to 20 kHz 20 Hz to 8 kHz
Frequency weighting A, C, and Z
Time weighting F (Fast) and S (Slow)
Level range Single range (Linearity range: 113 dB)

Bar graph display range max Max. 110 dB (20 to 130 dB)
Switching of bar graph display Set the upper/ lower limit in 10 dB increments.
RMS detection circuit Digital processing method
Sampling cycle 20.8 μs (Lp, Leq, LE, Lmax, Lmin, Lpeak : sampling frequency: 48 kHz)
100 ms (LN )
Calibration Electrical calibration performed according to IEC and JIS standards, using internally generated signals: acoustic calibration performed with the NC-74.
Correction functions Windscreen correction:
Compliant with IEC 61672-1 and JIS C 1509-1 standards when the windscreen is installed.
Diffuse sound field correction:
Correction of frequency characteristics in order to comply with standards (ANSI S1.4) in diffuse sound field.
Delay time The meter can be set to start measuring a specified time (OFF, 1, 3, 5 or 10 s) after the start button has been pressed or when a user-set trigger is exceeded.
Back erase function When the PAUSE key is pressed to pause measurement, the preceding (user selectable) 0, 1, 3 or 5 s data are excluded from processing.
Display Backlit semitransparent color TFT LCD display WQVGA (400 x 240 dots)
*LCD with touch panel (Capacitive Touch Panel)
Numerical display update frequency: 1 s
Bar graph update frequency: 100 ms
Store
Manual Data for measurement results are stored manually in single address increments.

Number of data Internal memory: max. 1 000 sets
SD Card: depends on the capacity of the SD Card*1
Auto*2 Instantaneous values (Lp mode) and processed values (Leq mode) are stored continuously and automatically at preset intervals.

Lp sampling cycle 100 ms, 200 ms, 1 s, Leq 1s
Leq sampling cycle 10 s, 1, 5, 10, 15, 30 min, 1, 8, 24 h, and user selected time (up to 24 hours)
Measurement Time Max. 1 000 h in Auto Lp storage mode, max. 100 000 addresses in Auto Leq storage mode(depends on the capacity of the SD card)*1
Data recall Allows viewing of stored data
Setup memory Up to five setup configurations can be saved in internal memory, for later recall Start up via file settings previously stored on SD card possible
Waveform recording*3

File format Uncompressed waveform WAVE file
Sampling frequency Select 48 kHz, 24 kHz or 12 kHz
Data length Select 24 bit or 16 bit
Outputs DC output Output DC signals using a frequency weighting characteristic selected by processing.

Output voltage 2.5 V, 25 mV / dB at bar graph display full scale
AC output Output AC signals using a frequency weighting characteristic selected by processing or by A, C, Z-weighting.

Output voltage 1 V (rms values) at bar graph display full scale
Comparator output*2 Turns on when the open-collector output exceeds the set value
(max. applied voltage 24 V, max. current 60 mA, allowable dissipation 300 mW).
USB Allows USB to be connected to a computer and recognized as a removable disk
Allows USB to be controlled via communication commands
RS-232C communication Allows for RS-232C communication via use of a dedicated cable
Data continuous output*2

Type of data Instantaneous value Lp
Processed value Leq, Lmax, Lmin, Lpeak
Output interval 100 ms
Print out Printing of measurement results on dedicated printer DPU-414
Power requirements Four IEC R6 (size AA) batteries (alkaline or rechargeable batteries) or external power supply

Battery life (23 ℃) Alkaline battery LR6 (AA): 26 h
Ni-MH secondary battery: 25 h
At the maximum * Depends on the setting
AC adapter NC-98C (NC-34 for previous models cannot be used)
External power voltage 5 to 7 V (rated voltage: 6 V)
Current consumption Approximately 90 mA (normal operation, rated voltage)
Ambient conditions Temperature -10 to +50 ℃
Humidity 10 to 90 % RH (non-condensing)
Dustproof / water-resistant performance *4 IP code: IP54 (except for microphone)
See precautions regarding waterproofing
Dimensions, weight Approx. 250 (H) x 76 (W) x 33 mm(D), approx. 400 g (with batteries)
Supplied accessories Storage case x 1, Windscreen WS-10 x 1, Windscreen fall prevention rubber x 1, Hand strap x 1, LR6 (AA) alkaline batteries x 4, SD card 512 MB×1 (NX-42EX preinstalled model only)
*1 Use Rion fully guaranteed products.
*2 NX-42EX required (sold separately).
*3 NX-42WR required (sold separately).
*4 Protection against harmful dust and water splashing from any direction.
[ Precautions regarding waterproofing ]
Before use, verify that the rubber bottom cover and the battery compartment lid are firmly closed.
To maintain the water and dust proof rating, internal packing replacement is required every two years (at cost).
Options
Options
Product name Product number
Extended function program (Inst.on 512 MB SD card) NX-42EX
Waveform recording program*2 (Inst.on 2 GB SD card) NX-42WR
Octave, 1/3 octave real-time analysis program*2 (Inst.on 512 MB SD card) NX-42RT
Reverberation time measurement program*2 (Inst.on 512 MB SD card) NX-42RV
FFT analysis program*2 (Inst.on 512 MB SD card) NX-42FT
Data management software for environmental measurement AS-60
Data management software for environmental measurement
(Includes the octave and 1/3 octave data management software)
AS-60RT
Data management software for environmental measurement
(Includes the vibration level data management software)
AS-60VM
Waveform analysis software AS-70
SD Card 512 MB MC-51SD1
SD Card 2 GB MC-20SD2
AC adapter (100 V to 240 V) NC-98C
Battery pack BP-21A
Microphone extension cables EC-04 (from 2 m)
BNC-Pin output code CC-24
Comparator output cable CC-42C
Printer DPU-414
Printer cable CC-42P
RS 232C serial I/O cable CC-42R
USB cable Generic USB cable can be used
Sound calibrator NC-74
All-weather windscreen WS-15
Windscreen mounting adapter WS-15006
Rain-protection windscreen WS-16
Sound level meter tripod ST-80
All-weather windscreen tripod ST-81
*1 Use Rion fully guaranteed products.
*2 NX-42EX required (sold separately).
*3 NX-42WR required (sold separately).
*4 Protection against harmful dust and water splashing from any direction.
[ Precautions regarding waterproofing ]
Before use, verify that the rubber bottom cover and the battery compartment lid are firmly closed.
To maintain the water and dust proof rating, internal packing replacement is required every two years (at cost).
Correspondence table for previous model and new model
Correspondence table for previous model and new model(Sound Level Meter Class1)
Previous model lineup
New model lineup
NA-60
NL-10
NL-10A
NA-25
NL-15


NL-52
Previous model lineup
New model lineup
NL-14
NL-16
NL-18
NL-31
NL-32


NL-52 + NX-42EX
Correspondence table for previous model and new model(Sound Level Meter Class2)
Previous model lineup
New model lineup
NA-09
NL-02
NL-01
NL-05
NA-24
NA-20
NL-02A
NL-01A
NL-05A
NL-20


NL-42
Previous model lineup
New model lineup
NL-04
NL-06
NL-21
NL-22


NL-42 + NX-42EX