Rion NL-53 User manual

Class 1 Sound Level Meter NL-53
Class 2 Sound Level Meter NL-43
Operation Guide
Instruction Manual

3
Organization of the NL-43/NL-53 Instruction Manual
There are four types of instruction manuals for Class 2 Sound Level Meter NL-43 and Class 1 Sound Level Meter NL-53.
Quick Start Guide
This manual describes the basic handling of Sound Level Meter NL-43/NL-53.
Operation Guide (This Document)
This manual describes how to use Sound Level Meter NL-43/NL-53, how to connect and use peripheral devices
such as sound level recorders and printers, and what to do when using an SD card.
Communication Guide
This manual describes communication between a computer and Sound Level Meter NL-43/NL-53 via a serial interface.
It describes such topics as the communication protocol, commands for controlling the sound level meter, and data
output from the sound level meter.
Technical Guide
This manual is a technical guide to the sound level meter and noise measurements, including the performance of
Sound Level Meter NL-43/NL-53, microphone structure and characteristics, and how extension cables and windscreens
affect measurements.
You can download the Instruction Manuals from our website:
https://rion-sv.com/nl-43_53_63/manual/

4
Organization of This Manual
This manual describes the functions and operation method of the Class 2 Sound Level Meter NL-43 and Class 1
Sound Level Meter NL-53. When the measuring system is congured with other equipment, make sure to read the
instruction manual of the equipment for how to operate the other equipment.
In addition, safety precautions are described on Page 5 onwards. Please be sure to read them.
The manual consists of the chapters listed below.
• Overview of This Product
Describes the basic information on this device.
• Terminology / Notation
Explains notation such as quantiers and their names.
• Name and Function of Each Part
Briey describes the name and function of each key and port.
• Turning on the Power
Describes how to turn on the power.
• Reading the Display
Explains the symbols displayed on the screen.
• Setting Menu
Describes how to congure the settings of the device.
• Store Operation
Describes how to store the measurement data.
• Connection with Peripheral Devices
Describes how to connect peripheral devices.
• Calibration
Describes how to calibrate the device.
• Measurement
Provides the basic explanation of measurement.
• Optional Programs
Describes optional programs.
• Specications
Lists the technical specications.

5
Safety precautions
The precautions shown here are intended to help you use the product safely and correctly, and to prevent harm and
damage to you and other people. Incidents that could occur as a result of incorrect handling are divided into two
categories: “WARNING” and “CAUTION”. Make sure to follow the contents of all these categories because they are
serious matters related to safety.
Examples of pictorial indications
Specic prohibitions may be displayed in the illustrations.
Prohibitions Instructions
Display Meaning
WARNING Indicates a possibility of death or serious injury due to incorrect handling.
CAUTION Indicates a possibility of personal injury or property damage due to incorrect handling.
Important Failure to observe the precautions indicated by this may result in damage to the device.
Note Denotes special information that is helpful in utilizing the capabilities of the device but that is not
directly related to safety.
• Handling of the batteries
WARNING
If electrolyte leaking from the batteries gets into your eyes, rinse with water without rubbing and immediately
seek medical attention.
Failing to do so may result in blindness.
If electrolyte leaking from the batteries gets on your skin or clothes, wash it off immediately with water.
• Handling of this product
WARNING
Do Not
Disassemble
Never disassemble, repair, or modify the product.
Doing so may cause a re, electric shock, or an accident.
No Wet Hands
Do not connect the power cable or remove the main unit with wet hands.
Doing so may cause electric shock or injury.
Keep Dry
Do not immerse the main unit in water or splash water on it.
The microphone is not waterproof. Immersing it in water or splashing it with water may cause electric shock or malfunction.
The water resistance of the main unit only mitigates potential damage caused by a small amount of rainfall, etc. If the main unit is
exposed to more than a small amount of rainfall, etc., it may cause electric shock or malfunction.
Safety Precautions / Precautions for Use

6
Safety Precautions / Precautions for Use
Do not use the device for purposes other than for what it is originally intended.
Keep the product away from heat sources such as re and stoves.
Failure to do so may cause a re, electric shock, or malfunction.
Do not use the device if any abnormality such as damage is discovered.
Continuing to use the device regardless of an abnormality may cause electric shock or re. In such circumstances, please contact
your dealer.
Do not use the device if there is something wrong with it, such as it becomes abnormally hot.
Doing so may result in a malfunction or re.
Do not use or connect to the power supply in a humid place such as a bathroom or in a place where it may
get wet.
Doing so may cause electric shock or malfunction.
Do not use, store, or leave the product in a hot place such as in a place exposed to re, direct sunlight, or
inside a car on a hot day.
Doing so may cause re, battery breakage, or overheating.
When disposing of the product, do not set it alight.
Doing so may cause a re or the batteries to explode. When disposing of the product, follow the regulations of your country or local
municipality.
Do not use the power cable connected to the optional AC adapter with a voltage other than 100 V AC.
The power cable connected to the AC adapter is a 100 V AC compatible cable that conforms to electrical safety standards. We cannot
guarantee the safety of the device if it is used with a voltage other than 100 V AC. Use the power cable that complies with the laws
and regulations of your area.
If there is dust on the external power supply port, wipe it off before connecting the AC adapter.
Failure to do so may result in electric shock, short circuit, or re.
Wipe off any water on the main unit and the external power supply port before connecting to the power supply.
Failure to do so may result in electric shock, short circuit, or re.
If there is a problem with the device during use, turn off the power and disconnect the AC adapter and remove
the batteries.
In such circumstances, please contact your dealer.
Always turn off the power after use.
Turn off the power and remove the batteries if you intend to store the product for a long time without using it. Leaving the batteries
may cause the electrolyte to leak. Remove the AC adapter.
Make sure to hold the plug or connector when disconnecting a cord or cable.
Do not apply excessive force, such as holding the cord or cable and pulling them out.
CAUTION
Do not use or store the product within the reach of children or pets.
Doing so may result in electric shock, injury, or accidental ingestion.
Do not store the device in places in which it will be subject to water, dust, high temperatures, high humidity, or
in direct sunlight. Do not use or store the device in places where it may be adversely affected by salt, sulfur,
chemicals, gases, etc.
The operating temperature for this device is -10°C to +50°C and the humidity range is 10% to 90% RH.
* In the event of a product defect caused by RION, RION will repair or replace the device.

7
Safety Precautions / Precautions for Use
Precautions for use
• Avoid using and storing the product in places with high temperatures and humidity, or in places exposed to direct
sunlight for long periods of time.
• If there is a drastic change in the surrounding temperature, the product may malfunction due to internal condensation.
• As the main unit is a precision electronic device, avoid using or storing it in locations subject to shock or vibration.
• If you do not intend to use the device for a long time, remove the batteries, and store it.
• Do not insert wires, metal pieces, conductive plastics, etc. through any holes or gaps in the product. Doing so
may result in a malfunction.
• Do not replace the microphone or preamplier with those with numbers different from those specied on the serial
number label.
• Do not use the preamplier of this device with other sound level meters. Doing so may damage the preamplier.
• If you are using the device outdoors and it starts raining, stop taking measurements and keep the device dry. If
the device gets wet, wipe it off with a dry cloth and dry it in a well-ventilated environment.
• Make sure the microphone and microphone grid are installed securely before using or storing the device. If there is
any looseness, turn off the power, retighten the microphone and microphone grid before using or storing the device.
• Store the device in an appropriate position in the included carrying case.
• Two device units can be stored in the carrying case. If storing a device in an empty space in the case, wrap the
device with bubble wrap to protect it. Note that we assume no responsibility for any damage or malfunction of the
device if it is stored in an empty space.
• The touch panel surface is easily damaged, so do not poke or hit it with an object such as a pen, pencil, or
screwdriver.
• To maintain the accuracy of measurements, inspect the device regularly. When using the device for transactions
or certication activities, the device needs to be subject to an authorized inspection according to the rules and
regulations of the relevant country.
• Be aware that removing the sticker will cause the device to be no longer subject to the dustproof and waterproof
performance warranty.
• Note the following points to maintain the dustproof and waterproof performance of the device:
• Make sure that the battery compartment cover and bottom cover are closed securely.
• Do not open the battery compartment cover or bottom cover while the device is wet.
• Do not leave the device in a wet state. Wipe off any water droplets and dry the device.
• To check the dustproof and waterproof performance of the device, send it for regular inspection and calibration.
• We recommend regularly having the packing inside the case and the bottom cover replaced (for a fee). For
replacement of the packing and the bottom cover, please contact your dealer.
• The rechargeable backup battery for the clock of this device is a consumable item. We recommend regularly
having the battery replaced (for a fee). For replacement of the rechargeable battery, please contact your dealer.
• Be sure to turn off the power before inserting or removing the SD card.
• Never format the optional program card such as NX-43EX and NX-43WR with SD card formatting software (such
as SD Formatter). Otherwise, the program data on the card will be erased and the respective functions can no
longer be used. Restoration of the erased program is not guaranteed.

8
Safety Precautions / Precautions for Use
[Disclaimer]
• RION shall not be held accountable for the following damages:
Any damage caused by earthquakes, lightning, wind and oods, res for which RION is not responsible, actions or
accidents by a third party, intentional or negligent misuse by the customer, or use under other abnormal conditions.
• RION shall not be held accountable for the following incidental damages arising from the use or inability to use
this product:
Alteration or loss of recorded content, loss of business prots, or the interruption of business, etc.
• RION shall not be held accountable for any damage caused by not following the contents of this document.
[Cleaning the product]
• To clean the device, use a dry, soft cloth or a cloth wrung out with lukewarm water. Do not use organic solvents
such as benzene or alcohol.
[What to do when disposing of the product]
• When disposing of this product or batteries, make sure to consult with your local municipality.

9
Contents
Organization of the NL-43/NL-53 Instruction Manual 3
Organization of This Manual 4
Safety Precautions / Precautions for Use 5
Safety precautions ……………………………………………………………………………………………… 5
Precautions for use ……………………………………………………………………………………………… 7
1 Overview of This Product 12
2 Terminology and Notation 14
3 Name and Function of Each Part 16
4 Turning on the Power 20
4.1 Inserting the batteries …………………………………………………………………………………… 21
4.2 Connecting an external power supply ………………………………………………………………… 23
4.3 Backup battery …………………………………………………………………………………………… 25
4.4 Turning on/off the power………………………………………………………………………………… 26
5 Reading the Display 27
5.1 Sound level screen (main channel display) ………………………………………………………… 27
5.2 Sound level screen (sub channel display) …………………………………………………………… 32
5.3 Calculated value screen ………………………………………………………………………………… 33
5.4 Time-Level screen ……………………………………………………………………………………… 34
5.5 Message display ………………………………………………………………………………………… 35
6 Setting Menu 36
6.1 [Menu] screen …………………………………………………………………………………………… 36
6.2 System …………………………………………………………………………………………………… 37
6.2.1 Time and Date …………………………………………………………………………………… 38
6.2.2 LCD Settings …………………………………………………………………………………… 38
6.2.3 Power……………………………………………………………………………………………… 39
6.2.4 Eco Setting ……………………………………………………………………………………… 39
6.2.5 SD Card…………………………………………………………………………………………… 40
6.2.6 Security …………………………………………………………………………………………… 40
6.2.7 System Information ……………………………………………………………………………… 41

10
6.2.8 User Manual (QR code) ………………………………………………………………………… 41
6.3 Display …………………………………………………………………………………………………… 42
6.3.1 Bar Graph ………………………………………………………………………………………… 42
6.3.2 Leq Calc. ………………………………………………………………………………………… 43
6.3.3 Time-Level ……………………………………………………………………………………… 43
6.4 Measure…………………………………………………………………………………………………… 44
6.4.1 Sub Channel Settings …………………………………………………………………………… 45
6.4.2 Frequency Weighting …………………………………………………………………………… 45
6.4.3 Time Weighting ………………………………………………………………………………… 46
6.4.4 Windscreen Correction ………………………………………………………………………… 46
6.4.5 Diffuse S.F. Corr. ………………………………………………………………………………… 47
6.5 Store ……………………………………………………………………………………………………… 48
6.5.1 Store Mode ……………………………………………………………………………………… 49
6.5.2 Store Name (the same for each mode) ……………………………………………………… 49
6.5.3 Address (Manual mode) ………………………………………………………………………… 49
6.5.4 Meas. Duration (Manual mode)………………………………………………………………… 50
6.5.5 User Setting (Manual mode) …………………………………………………………………… 50
6.5.6 Back Erase (Manual mode) …………………………………………………………………… 51
6.5.7 Delay Time (Manual mode, Auto mode) ……………………………………………………… 51
6.5.8 LN Mode (the same for each mode) ………………………………………………………… 52
6.5.9 Overview ………………………………………………………………………………………… 52
6.6 I/O ………………………………………………………………………………………………………… 53
6.6.1 Ref. Signal Output ……………………………………………………………………………… 54
6.6.2 Signal Output …………………………………………………………………………………… 54
6.6.3 I/O Port …………………………………………………………………………………………… 56
6.6.4 USB ……………………………………………………………………………………………… 57
6.6.5 LAN ……………………………………………………………………………………………… 57
6.7 Save/Load Settings ……………………………………………………………………………………… 58
6.7.1 Saving settings…………………………………………………………………………………… 59
6.7.2 Loading settings ………………………………………………………………………………… 61
6.7.3 Renaming the settings le ……………………………………………………………………… 62
6.7.4 Deleting the settings …………………………………………………………………………… 63
6.7.5 Startup settings ………………………………………………………………………………… 64
6.8 Changing the language ………………………………………………………………………………… 65
6.9 Restoring factory default settings ……………………………………………………………………… 66
7 Store Operation 69
7.1 Store operation in Manual mode ……………………………………………………………………… 70

11
7.1.1 Saving to internal memory……………………………………………………………………… 70
7.1.2 Loading the saved data ………………………………………………………………………… 74
7.1.3 Deleting the saved data ………………………………………………………………………… 77
7.1.4 Copying data from the internal memory to the SD card …………………………………… 79
7.2 SD card …………………………………………………………………………………………………… 82
7.2.1 Formatting the SD card ………………………………………………………………………… 82
7.2.2 Transferring the data saved on the SD card to a computer ………………………………… 84
7.3 Saving the screen ……………………………………………………………………………………… 86
8 Connection with Peripheral Devices 89
8.1 Attaching the windscreen ……………………………………………………………………………… 89
8.2 Diffuse sound eld correction settings ………………………………………………………………… 92
8.3 Setting the SD card and program card ……………………………………………………………… 94
8.4 Mounting on a tripod …………………………………………………………………………………… 95
8.5 Connecting the microphone extension cable ………………………………………………………… 96
8.6 Connecting to a printer ………………………………………………………………………………… 98
8.7 Connecting the AC/DC output ports………………………………………………………………… 107
8.7.1 AC OUT (AC output) ………………………………………………………………………… 107
8.7.2 DC OUT (DC output) ………………………………………………………………………… 111
8.8 Connection with level recorder or data recorder ………………………………………………… 114
8.9 Computer connection ………………………………………………………………………………… 121
9 Calibration 122
10 Measurement 126
10.1 Setting the date and time …………………………………………………………………………… 126
10.2 Checking the sound level (
Lp ) (current state) ……………………………………………………… 128
10.3 Measuring the sound level (
Lp ) (measurement state) …………………………………………… 129
10.4
L
eq calculation ………………………………………………………………………………………… 133
10.5 When taking measurements in a dark place ……………………………………………………… 142
10.6 File organization ……………………………………………………………………………………… 144
10.7 How to import the data into a computer …………………………………………………………… 145
11 Optional Programs 148
12 Specications 149

12
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, preamplier, and main unit, and the microphone and preamplier
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 conguring the necessary settings.
• The main unit’s input/output functions include an alternating current (AC) / direct current (DC) terminal, an RS-232C
terminal, a USB terminal, and a LAN function (when the NX-43EX is installed) 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 specications.
• 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.
• The device can be powered by alkaline AA batteries or Ni-MH rechargeable AA batteries, and can operate
continuously for approximately 12 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.

13
Overview of This Product
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.
Name
Frequency
weighting
Time
weighting
Instantaneous
value Time-weighted sound pressure level
L
p
✓ ✓
Calculated
value
Equivalent continuous sound level
L
eq ✓–
Sound exposure level
L
E
✓–
Maximum sound level
L
max ✓ ✓
Minimum sound level
L
min ✓ ✓
Percentile sound level
L
N
L
N1
, L
N2
, L
N3
, L
N4
, L
N5
(0.1 to
99.9, 0.1-increment steps)
✓ ✓
Peak sound level
L
peak ✓–
Takt-max sound level
L
tm5 ✓ ✓
Device usage environment
Place of use Indoors or outdoors
Altitude Up to 2,000 m
Ambient temperature -10°C to 50°C
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

14
2
Terminology and Notation
Quantiers and their names with Sound Level Meter NL-43/NL-53
Depending on whether the device has frequency weighting, there is no distinction between sound level and sound
pressure level, with them both treated as the sound level.
Notation and name
with NL-43/NL-53
Frequency
weighting
Measurement value
Time weighting
F-weighting S-weighting
L
p
Sound pressure level
A-weighting A-weighted sound pressure level L
AF
L
AS
C-weighting C-weighted sound pressure level L
CF
L
CS
Z-weighting Z-weighted sound pressure level L
ZF
L
ZS
L
eq
Equivalent
continuous sound level
A-weighting Equivalent continuous A-weighted sound level L
Aeq
C-weighting Equivalent continuous C-weighted sound level L
Ceq
Z-weighting Equivalent continuous Z-weighted sound level L
Zeq
L
E
Sound
exposure level
A-weighting A-weighted sound exposure level L
A E
C-weighting C-weighted sound exposure level L
C E
Z-weighting Z-weighted sound exposure level L
Z E
L
max
Maximum sound level
(Same for L
min)
A-weighting Maximum A-weighted sound level L
AFmax
L
ASmax
C-weighting Maximum C-weighted sound level L
CFmax
L
CSmax
Z-weighting Maximum Z-weighted sound level L
ZFmax
L
ZSmax
L
N
Percentile sound level
A-weighting Percentile A-weighted sound level L
AF N
L
AS N
C-weighting Percentile C-weighted sound level L
CF N
L
CS N
Z-weighting Percentile Z-weighted sound level L
ZF N
L
ZS N
L
peak
Peak sound level
A-weighting A-weighted peak sound level ( L
Apeak)
C-weighting C-weighted peak sound level L
Cpeak
Z-weighting Z-weighted peak sound level L
Zpeak
L
tm5
Takt-max
sound level
A-weighting Takt-max A-weighted sound level L
Atm5 –
C-weighting Takt-max C-weighted sound level –
Z-weighting Takt-max Z-weighted sound level –
• There is no combination of Peak sound level.
• Measured quantities in parentheses are not commonly used.
Note

15
Terminology and Notation
The notation of quantiers in international standards and JIS with Sound Level Meter NL-43/NL-53
Quantiers are taken from ISO 1996, IEC 61672-1, JIS C 1509-1 and JIS Z 8731.
Notation and name
with NL-43/NL-53
Frequency
weighting
ISO 1996
notation
JIS C 1509-1
(IEC 61672-1) notation
JIS Z 8731
notation
L
A
A-weighted sound level A-weighting
L
p A–
L
p A
L
C
C-weighted sound level C-weighting –––
L
Z
Sound level Z-weighting
L
p
– L
p
L
Aeq
Equivalent continuous
A-weighted sound level
A-weighting L
Aeq, T
L
Aeq, T
L
Aeq, T
L
Ceq
Equivalent continuous C-weighted
sound level
C-weighting –––
L
Zeq
Equivalent continuous sound level Z-weighting –––
L
A E
A-weighted Sound exposure level A-weighting
L
E A
L
A E , T
L
E A
L
C E
C-weighted Sound exposure level C-weighting –––
L
Z E
Z-weighted Sound exposure level Z-weighting –––
L
A N
L
A5
5% Percentile A-weighted
sound level
A-weighting
L
A N , T
L
A5, T
–
L
A N , T
L
A5, T
L
A10
10% Percentile A-weighted
sound level
L
A10, T
– L
A10, T
L
A50
50% Percentile A-weighted
sound level
L
A50, T
– L
A50, T
L
A90
90% Percentile A-weighted
sound level
L
A90, T
– L
A90, T
L
A95
95% Percentile A-weighted
sound level
L
A95, T
– L
A95, T
L
Amax
Maximum A-weighted sound level A-weighting
L
p A,max
L
Amax
L
p A,max
L
Amin
Minimum A-weighted sound level A-weighting –––
L
Cpeak
C-weighted peak sound level C-weighting –
L
Cpeak –

16
3
Name and Function of Each Part
Front Right side
3
START / STOP PAUSE / CONT
1
Microphone
Preamplier
Operation panel
(Page 17)
Microphone grid
2
No. Name Description
1Microphone and
preamplier
The microphone and preamplier can be separated from the main unit. They can be
installed at a distance from the main unit using an extension cable (optional).
2Touch panel
LCD display with backlight.
The sound level is displayed numerically and as a bar graph. Also displayed are the
operating status of the device, set measurement conditions, warnings, and other information.
The display can be operated by touch.
3Card slot (SD) A slot for inserting an SD card.
• Do not use a microphone and preamplier other than those indicated on the serial number label on the back of the device.
• Make sure the microphone and microphone grid are installed securely before using or storing the device.
If there is any looseness, retighten the microphone and microphone grid before using or storing the device.
Note

17
Name and Function of Each Part
Operation panel
START / STOP PAUSE / CONT
1
32
4
START / STOP
No. Name Description
1Indicator LED Lights or ashes red or blue depending on the operation and status of the device.
2START/STOP key
Used when starting or ending measurement.
Press the START/STOP key from the current state (sound level display) to enter the
measurement state. Press again to end the measurement.
Returns to the measurement screen if pressed while operating the menu.
3PAUSE/CONT key
Used to pause the screen display. Also, when pressed during measurement in Manual
mode, measurement can be paused. Press again to resume.
During PAUSE in Manual mode, the indicator LED ashes blue.
*When back erase is set, you can omit from the calculation the measured values from
the time of pressing up to several seconds before (1, 3, or 5 seconds can be selected).
Returns to the previous screen if pressed while operating the menu.
4POWER key
Press and hold for several seconds to turn the power on or off.
To forcibly turn the power off when the key lock is enabled, press and hold for 10 seconds
or longer.

18
Name and Function of Each Part
Bottom
DC 5.7-15V
USB
LAN
AC/DC
I/O
1 2 3 4 5 6
No. Name Description
1Bottom cover A cover to protect the ports. Ports can be accessed by opening the bottom cover.
2External power supply
port (DC IN)
This is the port for connecting AC Adapter NE-21P (optional) (input voltage of 100 V to
240 V, 50/60 Hz).
You can also use DC Polarity Converter CC-43J (optional) by connecting it to the NC-98
series dedicated AC adapter for sound level meters NL-42A/52A/62A and NL-42/52/62.
The Battery Pack BP-21A (optional) can also be used by connecting CC-43J (Page 23).
3I/O port An RS-232C port for connecting a computer or printer.
4USB port (Type-C) A port for connecting a computer. It is also possible to connect a commercially available
USB charger such as a mobile battery to supply power via USB.
5LAN port A port for connecting a computer or router.
This can be used by installing NX-43EX.
6AC/DC port
This port outputs AC signals corresponding to the sound pressure waveform after frequency
weighting, and DC signals corresponding to the sound level after frequency weighting
and time weighting.
Important
• To maintain the dustproof and waterproof performance, close the bottom cover securely when using the device.
• Do not use AC adapters or battery packs other than the specied ones. Doing so may result in a malfunction.
• The AC/DC port can output simultaneously using the AC/DC Output Splitter Cable CC-43S (optional).
• When using the AC adapter NC-98 series to operate the device, be sure to use the DC Polarity Converter CC-43J (optional).

19
Name and Function of Each Part
Back
AB
5
1
2
3
4
No. Name Description
1Serial number label The serial numbers of the microphone, preamplier, and sound level meter are listed here.
2Tripod mounting screw This screw can be used to mount the device to a camera tripod.
3Battery compartment Install four AA batteries to use the device.
There is a power-on mode switch in the battery compartment (Page 26).
4Nameplate It shows necessary information such as the model, date of manufacture, and applicable
standards of the device.
5Sticker The sticker guarantees the dustproof and waterproof performance of the unit.
Important
• Do not remove the sticker on the rear of the unit. If the sticker is removed, the “water and dust resistant performance” of
the unit is no longer guaranteed.

20
4
Turning on the Power
The device can be operated with four AA batteries (alkaline batteries, Ni-MH rechargeable batteries), or, as an
external power supply, AC Adapter NE-21P, Battery Pack BP-21A, or a USB power supply. The operating voltage is
5.7 V to 15 V (rated voltage 12 V).
• If you notice any abnormalities such as excessive heat, smoke, or a burning odor while using the device, immediately remove
the batteries, unplug the AC adapter plug from the outlet, and contact your dealer.
• If you do not intend to use the device for a long time, remove the batteries. Failing to do so may result in battery leakage.
WARNING
• Make sure to set the date and time before measuring.
• When the batteries are installed and the AC adapter is connected to the device, power is supplied from the AC adapter.
(The AC adapter takes priority in terms of power supplies. However, when power is supplied from the USB port, the USB
takes the top priority.)
When power is no longer supplied from the AC adapter due to a power outage, etc., the device automatically switches to
being powered by the batteries.
• When operating the device with just an external power supply, if the device is turned off when the external power supply
turns off, the auto-le-closing and auto-shutdown operations will not be performed, and so we recommend installing new
batteries in the main unit. However, make sure to set the power-on mode switch to the A side (Page 26).
• When using the specied AC adapter, the instrument can withstand momentary power failures of the commercial power
supply for up to approximately 50 ms.
Note