BRUEL & KJAER 2240 User manual

Technical
Documentation
HEADQUARTERS: Brüel & Kjær Sound & Vibration Measurement A/S · DK-2850 Nærum · Denmark
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Integrating-averaging
Sound Level Meter
Type 2240
User Guide
English BE 1695 −12
Cover_Special size.fm Page 1 Wednesday, February 26, 2014 4:19 PM

BE1695–12 February 2014
Integrating-averaging
Sound Level Meter
Type 2240
User Guide
Sonomètre intégrateur Type 2240 – Guide de l’utilisateur
Integrierende Schallpegelmesser Typ 2240 – Bedienungshandbuch
Fonometro integratore-mediatore 2240 – Manuale utente
Sonómetro integrador-promediador 2240 – Manual de usuario

Copyright 2003 – 2014, Brüel&Kjær Sound & Vibration Measurement A/S
All rights reserved. No part of this publication may be reproduced or distributed in any
form, or by any means, without prior written consent from Brüel & Kjær Sound & Vibration
Measurement A/S, Nærum, Denmark

Contents
Part 1
English.............................................................................................................................. 1
Chapter 1: Introduction ........................................................................................................ 3
Chapter 2: Getting Started................................................................................................... 7
Chapter 3: Making a Measurement.................................................................................... 15
Chapter 4: Basic Operation................................................................................................ 17
Chapter 5: Practical Guidelines ......................................................................................... 25
Chapter 6: Maintenance and Service................................................................................. 29
Chapter 7: Specifications................................................................................................... 31
Chapter 8: Glossary........................................................................................................... 35
Part 2
Français.......................................................................................................................... 41
Chapitre 1: Généralités...................................................................................................... 43
Chapitre 2: Se familiariser avec l’appareil.......................................................................... 47
Chapitre 3: Mesurer........................................................................................................... 57
Chapitre 4: Fonctions principales....................................................................................... 59
Chapitre 5: Conseils de manipulation ................................................................................ 69
Chapitre 6: Entretien et réparation..................................................................................... 73
Chapitre 7: Spécifications .................................................................................................. 75
Chapitre 8: Glossaire......................................................................................................... 79
Teil 3
Deutsch........................................................................................................................... 85
Kapitel 1: Einführung.......................................................................................................... 87
Kapitel 2: Erste Schritte ..................................................................................................... 91
Kapitel 3: Durchführung von Messungen......................................................................... 101
Kapitel 4: Wichtige Bedienfunktionen .............................................................................. 103
Kapitel 5: Praktische Hinweise......................................................................................... 113
Kapitel 6: Wartung und Service ....................................................................................... 117
Kapitel 7: Technische Daten............................................................................................ 119
Kapitel 8: Glossar............................................................................................................. 123
Parte 4
Italiano .......................................................................................................................... 129
Capitolo 1: Introduzione................................................................................................... 131
Capitolo 2: Preparazione ................................................................................................. 135
Capitolo 3: Esecuzione di una misura.............................................................................. 145
Capitolo 4: Funzionamento di base ................................................................................. 147
Capitolo 5: Linee guida.................................................................................................... 155
Capitolo 6: Assistenza e manutenzione........................................................................... 159
Capitolo 7: Dati tecnici ..................................................................................................... 161
Capitolo 8: Glossario........................................................................................................ 165

Part 5
Español ......................................................................................................................... 171
Capítulo 1: Introducción................................................................................................... 173
Capítulo 2: Puesta en marcha ......................................................................................... 177
Capítulo 3: Cómo hacer una medida............................................................................... 187
Capítulo 4: Operaciones Básicas..................................................................................... 189
Capítulo 5: Practical Guidelines....................................................................................... 199
Capítulo 6: Mantenimiento y Servicio .............................................................................. 203
Capítulo 7: Especificaciones............................................................................................ 205
Capítulo 8: Glosario......................................................................................................... 209

1
Part 1
English

2

3
Chapter 1
Introduction
Welcome ................................................................................................................................... 4
Summary of Contents................................................................................................................ 4
Conventions Used in this Guide ......................................................................................4
About Type 2240....................................................................................................................... 5
Uses and Features ..........................................................................................................5

Integrating-averaging Sound Level Meter Type 2240 – User Guide4
Welcome
This user guide introduces you to Type 2240 Integrating-averaging Sound Level Meter, how the
instrument works, which parameters you can measure, and how the instrument should be oper-
ated. In addition, some practical hints and guidelines are provided for, including all relevant
technical specifications. Finally, a glossary is added to help with specific terminology found in
this guide.
Summary of Contents
•Chapter 1 – Introduction: provides a general overview of the user guide and describes
Sound Level Meter Type 2240’s uses and features
•Chapter 2 – Getting Started: provides basic introductory information to sound level meters
and your instrument, including: general terminology, description of instrument parts, display
and key definitions, and battery installation
•Chapter 3 – Making a Measurement: step-by-step instructions on how to take a measure-
ment with Type 2240
•Chapter 4 – Basic Operation: contains information and appropriate procedures on how to
use Type 2240, including calibration, start-up, reading and key operation guides
•Chapter 5 – Practical Guidelines: gives tips on how to take a successful sound level meas-
urement, and what conditions and actions to avoid
•Chapter 6 – Maintenance and Service: provides care, cleaning and storage instructions as
well as information on where to go for service of your instrument
•Chapter 7 – Specifications: a comprehensive listing of technical specifications of Type 2240
•Chapter 8 – Glossary: a quick list of terms used in this guide and their definitions
Conventions Used in this Guide
Instructions and descriptions that refer to Type 2240 instrument keys are shown with the key
icons as seen on the instrument. See Chapter 2 for a complete list of of key icons and their
functions.
Instructions and descriptions that refer to Type 2240 instrument display text are indicated using
Courier type face. For example, “Press until LAeq is visible on the screen”.
Terms that are defined in the Glossary (Chapter 8), are highlighted in italic bold.

PART 1
English 5
About Type 2240
Uses and Features
Type 2240 is a Class 1 integrating-averaging sound level meter that measures time-average
sound level as defined in the IEC61672-1 standard. Its uses and features include:
• Simple sound level checks
• Control of noise levels in the workplace
• Complaint investigation
• Quick and easy to use
• Conforms with IEC61672-1 Class 1, IEC60651 and 60804 Type 1, ANSIS 1.4–1983 Type S1
and ANSIS1.43–1997 Type 1
• Simultaneous RMS and Peak measurements (with independent frequency weightings)
•MeasuresL
AF, LAeq, LAFmax and LCpeak
• No parameter configuration needed, the instrument is ready to measure from the start
• Large LCD display screen for easy reading
• Quasi-analogue bar graph shows current sound pressure level
• Under-range and overload indicators

Integrating-averaging Sound Level Meter Type 2240 – User Guide6

7
Chapter 2
Getting Started
What is a Sound Level Meter?.................................................................................................. 8
Description of Type 2240 Sound Level Meter........................................................................... 8
Sound Level Parameters.................................................................................................8
Instrument Components ................................................................................................10
Installing Batteries................................................................................................................... 13

Integrating-averaging Sound Level Meter Type 2240 – User Guide8
Type 2240 is a high performance, Class 1, integrating-averaging sound level meter with an
easy-to-use interface for quick and simple measurements. This chapter details the instrument’s
components and basic sound level parameters involved in measuring. With this information you
should be able to immediately start using your sound level meter. However, it is recommended
that you read the entire guide before using your Type 2240 in order to achieve the best results
from your instrument.
What is a Sound Level Meter?
A sound level meter is an instrument that is designed to measure sound levels in a standardised
way. A sound level meter comprises a microphone, a main processor and a read-out unit. The
microphone converts sound to an equivalent electric signal, which is processed by the instru-
ment. Processing includes applying frequency and time weightings to the signal as specified by
international standards, such as IEC61672-1 to which Type 2240 conforms.
Frequency weighting adjusts how the sound level meter responds to different sound frequen-
cies. This is necessary because the human ear's sensitivity to sound varies according to the
sound’s frequency. The most common frequency weighting in use is A-weighting, which adjusts
a signal in a way that best resembles the human ear's response at medium-range levels. It is the
weighting required for nearly all environmental and workplace noise measurements, and is
specified in international and national standards and guidelines. All of Type 2240’s measure-
ment parameters apply A-weighting, except for the measurement of peak levels where the ‘C’
frequency weighting is applied. In this case, C-weighting is used to take into account the energy
present at low frequencies even if they are not particularly annoying.
Time weighting specifies how the sound level meter reacts to changes in sound pressure. It is
an exponential averaging of the fluctuating signal, providing an easy-to-read value. Type 2240
always applies the Fast, or ‘F’ time weighting, which is the required weighting according to the
vast majority of international and national standards and guidelines.
Once the signal is processed through the weighting filters, the resulting sound pressure level is
displayed in decibels (dB) on the instrument's display. In Type 2240, the sound pressure level
values are updated once per second.
Description of Type 2240 Sound Level Meter
Sound Level Parameters
There are four sound level parameters measured by Type 2240: LAF, LAeq, LAFmax and LCpeak.
Once a measurement is started (using control key), all four parameters are measured simul-
taneously, you just need to choose which one you want to be displayed using the parameter
control key . Press this key at any time during, or after, a particular measurement to switch
to another sound level reading.

PART 1
English 9
The four sound level parameters are:
•LAF:The ‘A’ frequency-weighted and ‘F’ time-weighted sound pressure level. This parameter
is always displayed when the instrument is switched on, even if you have not started a meas-
urement. It is an instantaneous value, which is mainly used to determine the approximate
sound levels in order to select the appropriate sound level range to measure.
Fig.2.1
LAF parameter displayed
•LAeq:The equivalent continuous, ‘A’ frequency-weighted sound pressure level. LAeq is a lin-
ear average of all the varying sound pressure levels detected during a measurement. For a
number of international and national standards, it is the key parameter in determining annoy-
ance from environmental noise and assessing the risk of hearing deficiencies induced by expo-
sure to high sound levels at the work place. Note: LAeq is not time-weighted.
Fig.2.2
LAeq parameter displayed
•LAFmax:The maximum ‘A’ frequency-weighted and ‘F’ time-weighted sound pressure level
detected during a measurement. It is the maximum value of LAF detected during a measure-
ment. It is often used in comparison with another parameter (for example: LAeq) to ensure a
single noise event does not exceed a limit.
Fig.2.3
LAFmax parameter
displayed
•LCpeak:The maximum ‘C’ frequency-weighted, peak sound pressure level detected during a
measurement. LCpeak is used to assess risks of hearing deficiencies induced by very high
sound pressures of short durations at work places. Remember that peak levels can be very high

Integrating-averaging Sound Level Meter Type 2240 – User Guide10
without being harmful or even annoying, so care should be taken to use LCpeak only for its
intended purpose. Such high values can be misleading in situations where they are not called
for. Note: LCpeak is not time-weighted.
Fig.2.4
LCpeak parameter
displayed
LAFmax, LCpeak, and LAeq sound level parameters begin calculation only when a measurement is
started (press ), and stop only when the measurement is stopped (press again). LAF is
calculated automatically when the sound level meter is switched on.
The measured values of LAFmax, LCpeak, and LAeq are cleared whenever a new measurement is
started.
Instrument Components
Fig.2.5 Front, side and back view of Type 2240 instrument
The following descriptions refer to the numbered instrument parts in Fig.2.5:
1) Sound Level Meter body: The main part of your instrument.
2
3
4
5
6 7
8
9
11
1
10
Front Panel Side Panel Back Panel

PART 1
English 11
2) Sliding cover: Underneath the cover is a quick reference guide to help you use the three
control keys for setup and display of measurements. Slide to open, do not press. A diagram
of the quick guide is found in Fig.2.6.
3) Microphone: Brüel& Kjær’s Prepolarized Free-field ½″Microphone Type 4188 is used. A
robust and reliable microphone with a wide frequency range.
4) Preamplifier: Conditions the microphone signal before further processing.
5) Display screen: An LCD display showing:
a) the sound level parameter currently being viewed
b) elapsed measurement time
c) measurement reading in dB (decibels)
d) quasi-analogue bar graph representing current sound pressure level
e) battery level indicator
6) Start/Stop key : Press to start or stop a measurement.
7) Sound Level Parameter key : Press to scroll through sound level parameters that are
available to display (LA, LAeq, LAmax, or LCpeak), or hold down for 3 seconds to calibrate.
8) Sound Level Range key : Press to set sound level range (30 –110 dB or 60–140 dB).
9) Calibration switch: Adjust instrument calibration using the included screwdriver.
10) Power switch: Turn the instrument on and off.
11) Battery compartment: Slide the compartment’s lid to replace batteries when needed.
Instructions on replacing batteries follow in “Installing Batteries” on page 13.
Control Keys
Fig.2.6
Under the front panel’s
sliding cover is a quick
guide to help you use the
three control keys
LA
LAeq
LAmax
LCpeak
(3 sec.=Cal.)
30-110dB
60-140dB

Integrating-averaging Sound Level Meter Type 2240 – User Guide12
Note: All keys function step-wise, as illustrated by the quick guide’s use of arrows. Press a key
to step through the available functions. When the last possible function comes up, the instru-
ment will automatically scroll through the choices again as you continue to press.
Start/Stop Key
This key controls the initiation and completion of a measurement.
Sound Level Parameter Key
This key controls which sound level parameter is displayed. It is not necessary to configure any
sound level parameter, as all four parameters are measured simultaneously as soon as a meas-
urement is started.
Quick Guide Symbol Instructions
To start a measurement,
press until appears
on the display
To stop a measurement,
press until stops
flashing on the display
Quick Guide Symbol Instructions
LA
To display the A-weighted
sound pressure level, press
until LAappears on the
display. Note: LAis time-
weighted, using Fast
weighting
LAeq
To display the A-weighted,
equivalent continuous
sound pressure level, press
until LAeq appears on
the display
LAmax
To display the maximum A-
weighted sound pressure
level, press until LAmax
appears on the display.
Note: LAmax is time
weighted, using Fast
weighting
LCpeak
To display the C-weighted,
peak sound pressure level,
press until LCpeak
appears on the display.

PART 1
English 13
The Sound Level Parameter key can also be used to electrically calibrate the instrument by
holding down for three seconds. Actual adjustments are made using the calibration switch
on the side panel, and the included screwdriver. It is a good idea to calibrate the instrument
before and after a series of measurements to conform to required standards and ensure precise
results each time. See “Calibration” on page 18. for more information.
Sound Level Range Key
This key controls the sound level range to be measured.
Installing Batteries
Type 2240’s power supply consists of two AA-size (IECR6 or LR 6) alkaline batteries. To
install the batteries, do the following:
1) Make sure the sound level meter is switched off.
2) The battery compartment is located in the centre of the instrument’s back panel. Slide the
cover off.
Fig.2.7
Type 2240 with the
battery cover removed
3) Insert 2 new batteries following the +/– orientation shown at the bottom of the battery
compartment.
Quick Guide Symbol Instructions
30–110dB
To measure in this range,
press until the bar
graph shows a range of
30–110dB
60–140dB
To measure in this range,
press until the bar
graph shows a range of
60–140dB

Integrating-averaging Sound Level Meter Type 2240 – User Guide14
4) Slide the compartment cover back into place.
5) Switch the Power on. The battery symbol in the bottom left-hand corner of the instrument
display should indicate a full battery level . Note: If the instrument does not turn on,
check that you have inserted the batteries correctly.
The battery level has two black columns, each representing about 8 hours of remaining battery
time for a total of approximately 16 continuous hours of use (at room temperature). In extreme-
ly cold or hot environments, the remaining time may be less.
Both columns will be shown in the indicator when the battery level is full. It is time to replace
the batteries when the indicator is empty and flashing.
Caution:
It is possible for batteries to explode or leak if they are handled incorrectly, so:
• For long-term storage, remove the batteries and keep the sound level meter in a dry place
• Never mix different makes or types of battery
• Never mix charged and discharged batteries