Rion NA-28 User manual

3-20-41 Higashimotomachi, Kokubunji, Tokyo 185-8533, Japan
http://www.rion.co.jp/english/
INSTRUCTION MANUAL
SOUND LEVEL METER
NA-28

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Organization of the NA-28 Documentation
Documentation for the Sound Level Meter NA-28 comes in three parts, as
listed below.
Instruction Manual (this document)
Describes operating procedures for the Sound Level Meter NA-28, connec-
tion and use of peripheral equipment such as a level recorder and printer,
and use of the memory card.
Serial Interface Manual
Describes communication with a computer, using the serial interface built
into the Sound Level Meter NA-28. 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.
* Company names and product names mentioned in this manual are usually
trademarks or registered trademarks of their respective owners.

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Organization of This Manual
This manual describes the features, operation and other aspects of the Sound Level
Meter NA-28 (with 1/3 octave analysis function). If the unit is used together with
other equipment to congure a measurement system, consult the documentation of
all other components as well. The following pages 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.
Power On/Off
Explains how to operate the POWER key of the unit.
Reading the Display
Explains symbols and other information shown on the display of the unit.
Measurement
Explains the basic procedures for measurement.
Store Operation
Explains how to store measurement data.

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Memory Card
Explains how to use a memory card with the unit.
Input/Output Connectors
Explains the input and output connectors of the unit.
Default Settings
Lists the factory default settings of the unit.
Setup File
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.

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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
injury to persons and/or dam-
age to peripheral equipment.
Disregarding instructions
printed here incurs the risk of
damage to the product.
Mentioned about the tips to
use this unit properly. (This
messages do not have to do
with safety.)
Note

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Quantier notation
(Sound level and sound pressure level are expressed uniformly as sound pres-
sure level, distinguished by the use of frequency weighting.)
Measurement value
The time weighting characteristics
F, S, 10 ms I
Lp
Sound pressure
level
A-weighted sound pressure level LAF, LAS, LA10ms LAI
C-weighted sound pressure level LCF, LCS, LC10ms (LCI)
Z-weighted sound pressure level LZF, LZS, LZ10ms (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)
LE
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, LA10msmax LAImax
Maximum C-weighted sound level LCFmax, LCSmax, LC10msmax (LCImax)
Maximum Z-weighted sound level LZFmax, LZSmax, LZ10msmax (LZImax)
LN
Percentile sound
level
Percentile A-weighted sound level LAFNn, LASNn, LA10msNn (LAINn)
Percentile C-weighted sound level LCFNn, LCSNn, LC10msNn (LCINn)
Percentile Z-weighted sound level LZFNn, LZSNn, LZ10msNn (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 a existing at-weighted level.
• The combination of peak sound pressure level and takt-max with I
characteristics does not exist.
• Measurement value shown in brackets ( ) indicates items that can be
displayed as operation steps but are not used or not suitable.

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