Rion NL-42A Manuel utilisateur

3-20-41 Higashimotomachi, Kokubunji, Tokyo 185-8533, Japan

https://www.rion.co.jp/english/

INSTRUCTION MANUAL

Sound Level Meter

NL-42A / NL-52A

Organization of the NL-42A/NL-52A documentation

Documentation for the Sound Level Meter NL-42A/NL-52A comes in three

parts, as listed below.

Instruction Manual (this document)

Describes operating procedures for the NL-42A/NL-52A, connection and

use of peripheral equipment such as a level recorder and printer, and use

of the SD memory card.

Serial Interface Manual

Describes communication with a computer, using the serial interface built

into the NL-42A/NL-52A. The manual covers the communication protocol,

use of control commands for the sound level meter, format of data output

by the sound level meter, and other topics.

Technical Notes

This document provides in-depth information about sound level meter

performance, microphone construction and characteristics, inuence of

extension cables and windscreen on the measurement, and other topics.

The current instruction manual is available on our website.

(https://www.rion.co.jp/english/)

* Company names and product names mentioned in this manual are usually

trademarks or registered trademarks of their respective owners.

iii

Organization of this manual

This manual describes the features, operation and other aspects of the NL-42A/

NL-52A. If the unit is used together with other equipment to congure a mea-

surement system, consult the documentation of all other components as well.

Pages v and following contain important information about safety. Be sure to

read and observe these in full.

This manual contains the following sections.

Outline

Gives basic information about the unit.

Controls and Functions

Briey identies and explains the operation keys and connectors and all

other parts of the unit.

Preparations

Explains how to check the unit before use and how to install and set up the

unit for measurement.

Calibration

Explains how to calibrate the unit for measurement.

Reading the Display

Explains symbols and other information shown on the display of the unit.

Measurement

Explains the basic procedures for measurement.

Card capacity and store time

Lists the data store time corresponding to the SD memory card capacity, etc.

Store Operation

Explains how to store measurement data.

Input/Output Connectors

Explains the input and output connectors of the unit.

Default Settings

Lists the factory default settings of the unit.

Setup Files

Explains how to start up the unit using settings saved in a setup le.

Optional Accessories

Explains how to use the optional microphone extension cable, printer, and

level recorder with the unit.

Specications

Lists the technical specications of the unit.

FOR SAFETY

In this manual, important safety instructions are specially marked as shown

below. To prevent the risk of death or injury to persons and severe damage

to the unit or peripheral equipment, make sure that all instructions are fully

understood and observed.

Caution

Important

Disregarding instructions printed

here incurs the risk of damage to

the unit.

Additional information about

using the unit. (These notes do

not directly affect safety.)

Note

WARNING Disregarding instructions printed

here incurs the risk of death or

severe injury to persons.

Disregarding instructions printed

here incurs the risk of injury to

persons and/or damage to periph-

eral equipment.

vii

Quantier Notation

(Sound level and sound pressure level are expressed uniformly as sound

pressure level, distinguished by the use of frequency weighting.)

Measurement value

The time weighting characteristics

F, S I

Sound pressure

level

A-weighted sound pressure level LAF, LAS LAI

C-weighted sound pressure level LCF, LCS (LCI)

Z-weighted sound pressure level LZF, LZS (LZI)

Leq

Equivalent

continuous

sound level

Equivalent continuous A-weighted

sound level LAeq LAIeq

Equivalent continuous C-weighted

sound level LCeq (LCIeq)

Equivalent continuous Z-weighted

sound level LZeq (LZIeq)

Sound exposure

level

A-weighted sound exposure level LAE(LAIE)

C-weighted sound exposure level LCE(LCIE)

Z-weighted sound exposure level LZE(LZIE)

Lmax,Lmin

Maximum sound

level

Maximum A-weighted sound level

LAFmax, LASmax

LAImax

Maximum C-weighted sound level

LCFmax, LCSmax

(LCImax)

Maximum Z-weighted sound level

LZFmax, LZSmax

(LZImax)

Percentile sound

level

Percentile A-weighted sound level LAFNn, LASNn(LAINn)

Percentile C-weighted sound level LCFNn, LCSNn(LCINn)

Percentile Z-weighted sound level LZFNn, LZSNn(LZINn)

Lpeak

Peak sound level

A-weighted peak sound level (LApeak) ---

C-weighted peak sound level LCpeak ---

Z-weighted peak sound level LZpeak ---

Ltm5

Takt-max sound

level

Takt-max A-weighted sound level

LAtm5 ---

Takt-max C-weighted sound level

(LCtm5) ---

Takt-max Z-weighted sound level

(LZtm5) ---

• Z-weighted level is the same as an existing at-weighted level.

• The combination of peak sound level and takt-max with I character-

istics does not exist.

• Generally, measurement value shown in brackets ( ) are not used or

not suitable for evaluation.

viii

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