Brüel & Kjær 2245 User manual

INSTRUCTION MANUAL
Sound Level Meter
Type 2245
for use with Microphone Type 4966
www.bksv.com ©Brüel & Kjær. All rights reserved.
ËBE-1910---qÎ
BE 1910 – 11
English
BE 1910 – 11

BE 191011
November 2019 www.bksv.com
Sound Level Meter
Type 2245
with Microphone Type 4966
From Hardware Version 1.0
Firmware Variants:
FW-2245-000
FW-2245-001
FW-2245-002
Instruction Manual

Health and Safety Considerations
This apparatus has been designed and tested in accordance with
IEC/EN 61010 – 1 and ANSI/UL 61010 – 1
Safety Requirements for
Electrical Equipment for Measurement, Control and Laboratory
Use
. This manual contains information and warnings which must be
followed to ensure safe operation and to retain the apparatus in safe
condition.
Safety Symbols and Signal Words Used
The apparatus will be marked with this symbol when it is
important that you refer to the associated danger or
warning statement given in this manual
The manual uses this symbol when a danger or warning
statement is applicable
Hazardous Voltage/Electricity. Both the apparatus and
manual use this symbol when there is a risk for shock or
electrocution
Hot Surface. This manual will use this symbol when there is
a risk for burning or scolding
Earth (Ground) Terminal. The apparatus will be marked
with this symbol when applicable
Protective Conductor Terminal. The apparatus will be
marked with this symbol when applicable
Alternating Current. The apparatus will be marked with this
symbol when applicable
Danger Signals an imminent hazardous situation, which, if not
avoided, will result in death or serious injury
Warning Signals a possibly hazardous situation, which, if not
avoided, will result in death or serious injury
Caution Signals a hazardous situation, which, if not avoided, could
result in minor or moderate injury or damage to the
apparatus
Notice Signals a situation or practice that requires attention, but
does not directly result in personal injury if ignored
Risks and Hazards
Explosion Hazards
Danger: The apparatus is not designed to be used in
potentially explosive environments. It should not be
operated in the presence of flammable liquids or gases
Electrical Hazards
Warning: Any adjustment, maintenance and repair of the
open apparatus under voltage must be avoided as far as
possible and, if unavoidable, must be carried out only by
trained service
Caution: Switch off all power to equipment before connecting or
disconnecting their digital interface. Failure to do so could
damage the equipment
Mechanical Hazards
Caution: Whenever it is likely that the correct function or operating
safety of the apparatus has been impaired, it must be made
inoperative and be secured against unintended operation
Waste Handling
Brüel & Kjær complies with the EU’s Waste Electrical and
Electronic Equipment (WEEE) Directive, which issues the
following waste handling instructions:
• Do not dispose of electronic equipment or batteries as
unsorted municipal waste
• It is your responsibility to contribute to a clean and healthy
environment by using the appropriate local return and
collection systems
• Hazardous substances in electronic equipment or
batteries may have detrimental effects on the
environment and human health
• The symbol shown to the left indicates that separate
collection systems must be used for any discarded
equipment or batteries marked with that symbol
• Waste electrical and electronic equipment or batteries
may be returned to your local Brüel & Kjær representative
or to Brüel & Kjær Headquarters for disposal

Brüel & Kjær has made every effort to ensure the accuracy of the
information contained in this document. No responsibility is accepted
for any errors or omissions herein. It is the responsibility of the user to
ensure compliance with any legal or statutory requirements in the
country of use. Data may change, as well as legislation, therefore you
are advised to obtain copies of the most recently issued applicable
regulations, standards and guidelines.
All descriptions, illustrations and any other information relating to the
product are made by way of general description, are approximate only
and for the general guidance and information of the user. They cannot
be construed to imply representation or warranty as to their accuracy,
currency or completeness and are not intended to form the basis of any
contract.
The information in this document does not constitute a warranty,
representation or guarantee concerning the suitability or performance
of the product.
Brüel & Kjær shall not be liable for any loss whether direct, indirect,
incidental or consequential arising from the use of or reliance upon any
of the content of this document, regardless of whether such content has
been accurate or complete. Brüel & Kjær will not pay any damages
whether for loss or injury, punitive or otherwise, because of use of or
reliance upon any of the content in this document.
Brüel & Kjær and all other trademarks, service marks, trade names,
logos and product names are the property of Brüel & Kjær or a third-
party company. Nothing in this document may be construed as
granting, by implication, or otherwise any license or right to use any of
the trademarks without a prior written permission of Brüel & Kjær or
the owner of such trademark.
© Brüel & Kjær. All rights reserved.
Brüel & Kjær Sound & Vibration Measurement A/S
DK-2850 Nærum · Denmark
For service and support, contact your nearest Brüel & Kjær Customer
Care support team:
Headquarters: [email protected], [phone]
China (Beijing): [phone]
France: s[email protected], [phone]
Germany: [email protected], [phone]
Italy: [email protected], [phone]
Japan: [e-mail], [phone]
North & South America: [e-mail],
[phone]
Spain: [email protected], [phone]
UK & Ireland: [email protected], [phone]
Go to www.bksv.com/contact for contact information to our other
global offices.

Contents
CHAPTER 1
Introduction.................................................................................................................................................... 1
1.1 About This Manual .............................................................................................................................................. 1
1.2 System Overview................................................................................................................................................. 2
CHAPTER 2
Short Guide to the Sound Level Meter ............................................................................................................ 7
2.1 Introduction ........................................................................................................................................................ 7
2.2 Switching the Sound Level Meter On and Off ..................................................................................................... 7
2.3 Setting Up the Sound Level Meter ...................................................................................................................... 7
2.4 Calibration ......................................................................................................................................................... 14
2.5 Measuring with the Sound Level Meter............................................................................................................ 18
2.6 Viewing Measurements .................................................................................................................................... 19
2.7 Viewing Saved Measurements .......................................................................................................................... 20
2.8 Positioning the Microphone (Sound Level Meter) ............................................................................................ 21
2.9 Mounting the Sound Level Meter on a Tripod.................................................................................................. 21
2.10 Measuring Low-level Sounds............................................................................................................................. 21
2.11 Measuring at Low Static Pressure ..................................................................................................................... 22
2.12 Mechanical Vibration ........................................................................................................................................ 23
2.13 Frequency Weightings....................................................................................................................................... 23
2.14 Measured Quantities......................................................................................................................................... 25
2.15 Overload and Underrange................................................................................................................................. 32
CHAPTER 3
Conformance Testing .................................................................................................................................... 33
3.1 Introduction ...................................................................................................................................................... 33
3.2 Microphone, Accessories and Sound Fields ...................................................................................................... 33
3.3 Calibration During Pattern Evaluation and Periodic Tests ................................................................................ 34
3.4 Wi-Fi and Bluetooth During Tests ..................................................................................................................... 34
3.5 Mounting for Acoustical Tests........................................................................................................................... 35
3.6 Periodic Testing of Acoustical Frequency Responses........................................................................................ 35
3.7 Mounting for Mechanical Vibrations Tests ....................................................................................................... 35
3.8 Testing 1/1-octave Band and 1/3-octave Band Filters ...................................................................................... 35
3.9 EMC Test Procedures ........................................................................................................................................ 35
CHAPTER 4
Specifications................................................................................................................................................ 39
4.1 Introduction ...................................................................................................................................................... 39
4.2 Standards .......................................................................................................................................................... 39
4.3 Reference Environmental Conditions ............................................................................................................... 40
4.4 Reference Conditions for Acoustic Calibration ................................................................................................. 40
4.5 Microphone....................................................................................................................................................... 40
4.6 Frequency Responses........................................................................................................................................ 41
4.7 Directional Responses ....................................................................................................................................... 45
4.8 Self-generated Noise......................................................................................................................................... 52
4.9 Measuring Ranges ............................................................................................................................................. 53

4.10 Detectors........................................................................................................................................................... 55
4.11 Spectrum Analysis ............................................................................................................................................. 57
4.12 Influences from the Operating Environment .................................................................................................... 60
4.13 Wireless Interface to the Sound Level Meter ................................................................................................... 60
4.14 Electrical Interface to the Sound Level Meter................................................................................................... 62
4.15 Power Supply .................................................................................................................................................... 63
4.16 Warm-up Time .................................................................................................................................................. 63
4.17 Real-time Clock ................................................................................................................................................. 63
4.18 Mark Compliance .............................................................................................................................................. 64
APPENDIX A
Tables............................................................................................................................................................ 67
A.1 Electrical Frequency Responses ........................................................................................................................ 67
A.2 Free-field Frequency Responses ....................................................................................................................... 70
A.3 Diffuse-field Frequency Responses ................................................................................................................... 75
A.4 Free-field Frequency Responses for Diffuse-field Calibrated Instruments ....................................................... 80
A.5 Directional Responses....................................................................................................................................... 83
A.6 Periodic Testing of Acoustical Frequency Responses...................................................................................... 120
APPENDIX B
Cross-references to Standards ..................................................................................................................... 125
B.1 Introduction .................................................................................................................................................... 125
B.2 Cross-references to Standards ........................................................................................................................ 126
B.3 Irrelevant Topics.............................................................................................................................................. 129
INDEX ................................................................................................................................................................................. 131

1
Chapter 1
Introduction
1.1 About This Manual
This instruction manual for Sound Level Meter Type 2245 has been created to fulfil the documentation
requirements of the national and international standards that the sound level meter conform to. These
standards are listed in section 4.2.
For other microphone configurations, supplements to this manual will be provided.
Other documentation and sales material will also contain specifications for the sound level meter. In the event
of any unintended inconsistency between these and those in this instruction manual, the instruction manual
takes precedence.
Appendix B of this manual provides cross-references between specific paragraphs in the standards that require
topics to be documented and the corresponding sections in this manual that conform to them.
The PC and smart device software contain online help including user help for the sound level meter.
1.1.1 Conventions Used in this Manual
The term “sound level meter” is an abbreviation for “Sound Level Meter Type 2245” throughout this manual.
Selectable Buttons, Values and Pages on the Screen and Command
Indicated by bold type face (for example: select Enabled).
Parameters, Text and Variable Fields
Parameters, instructions, descriptions appearing on the screen and variables are indicated by italics (for
example: select as Input).
Menus and Screen Navigation
Indicated by bold typeface and arrows (for example, go to Measurement settings > Input > Sound field).
Notes and Hints
✐Please note: Notes contain nice-to-know information that does not convey possible risks to the user or
sound level meter.
⚑Hint: Hints are suggestions or tips to help the user avoid typical problems, or to perform tasks easier and/or
correctly.

Sound Level Meter Type 2245 – Instruction Manual
2
1.2 System Overview
1.2.1 Hardware and Firmware on the Sound Level Meter
To see the currently installed firmware and hardware on the sound level meter, go to the About screen (see
section 2.3.1).
There are three firmware variants:
•FW-2245-000: General type-approved firmware
•FW-2245-001: WELMEC type-approved firmware, Germany
•FW-2245-002: WELMEC type-approved firmware, Spain
The three firmware variants fulfil the specifications described in this manual.
The FW-2245-000 variant is a superset of the other variants.
The three firmware variants are identical, except for the following restrictions on FW-2245-001 and FW-2245-
002 compared to FW-2245-000:
• Installing and updating firmware can only be done by authorized personnel
• Measurements cannot be performed if the Clock has been reset and not automatically set afterwards (FW-
2245-000 gives a warning)
• Measurements cannot be opened if a checksum on data fails (FW-2245-000 gives a warning)
In addition, the following restrictions have been made to FW-2245-002:
• Changes to microphone parameters can only be made by authorized personnel (created, modified and
deleted)
• Calibration with changes to the sensitivity can only be made by authorized personnel
• The maximum allowed deviation from initial sensitivity of microphone is ±1.1 dB (instead of ±1.5 dB)
• Date format can only be dd/mm/YYYY or dd-mm-YYYY
• Time format can only be HH:mm:ss
• Decimal point can only be "," (comma)
• Saved legally relevant data can first be deleted after a 2-year retention period
1.2.2 Basic PC Software
Noise Partner for PC can be used for transferring measurement data from the sound level meter to a standard
PC for post-processing and reporting.
Noise Partner for smart devices can be used for controlling the sound level meter and for transferring data from
the sound level meter to the smart device for display and post-processing.
Noise Partner can be downloaded from Brüel & Kjær’s website. For instructions on using this software, see the
software’s online help.
1.2.3 Hardware Setup
This section provides an overview of the hardware components used with the sound level meter.
A hardware overview is provided in Fig.1.1; optional accessories are included in the figure.
The components needed for conformance testing of the sound level meter are listed in Table 1.1.

CHAPTER 1
Introduction 3
Fig.1.1
Hardware overview
Storage Box
KE-1034
Sound Level Meter
B&K 2245
Wrist Strap
DH-0819
Power Supply
ZG-0486
Base Staon
UL-0089
LAN Cable
AO-1450
Remote Control Unit
UL-1073
Tripod
UA-0750
Adapter Cable
AO-0846
B&K 2245 Sound Level Meter with Accessories in Hardshell Case
Oponal Accessories
½ Free-field Microphone
4966
Licenses (one or more of following):
• BZ-7300 Noise Partner
• BZ-7301 Enviro Noise Partner
• BZ-7302 Work Noise Partner
• BZ-7304 Exhaust Noise Partner
Sound Calibrator
4231
USB Cable
AO-0821
Windscreen
UA-1650
Phone/Tripod
Holder
UA-2237
Power Supply
ZG-0426
Tripod Extension
UA-1651
180240

Sound Level Meter Type 2245 – Instruction Manual
4
Table 1.1
Hardware components
needed for
conformance testing of
Sound Level Meter
Type 2245
Quantity Brüel & Kjær
Type/Part Number Description
1 Type 4966 Prepolarized Free-field ½Condenser Microphone
1 WA-0302-B Electrical Substitute for Microphone Type 4966, 15 pF
1 UA-0245 10–32 UNF to BNC Adapter
1 UA-1650 90 mm dia. Windscreen with auto-detect insert
1 UA-1651 Tripod Extension
1 UA-2238 Tripod Adapter
1 ZG-0486 Power Supply, with integrated USB-A socket
1 AO-0821-D-010 USB Shielded I/O Cable, type A to C, USB 2.0, 1 m
1 AO-0846 USB-C™ to 3.5 mm Mini Jack Adapter, shielded, for
analogue headphones
1 Type 4231 Sound Calibrator
1 Type 4226 Multifunction Acoustic Calibrator

CHAPTER 1
Introduction 5
1.2.4 Block Diagram
The block diagram of the sound level meter is shown in Fig.1.2.
Fig.1.2
Block diagram of
Type 2245
180241
Input
Output
External
Power
GPS
Main
Processor
USB-C™
Interface
Wi-Fi®
Interface
BLE
Interface
Keyboard
Display
Light
Ring
Amplifier A/D
Converter
D/A
Converter Amplifier
Power
Supply
Baery
Data

Sound Level Meter Type 2245 – Instruction Manual
6

7
Chapter 2
Short Guide to the Sound Level Meter
2.1 Introduction
This chapter contains a brief guide to the use of the sound level meter.
The user interface of the sound level meter has:
• A screen for displaying settings, results and status
• A keyboard for navigating on the screen, changing settings and controlling the measurement
• A colour-coded light ring to reflect the status of the instrument
2.2 Switching the Sound Level Meter On and Off
To switch on, press on the sound level meter for a few seconds. The sound level meter will start-up showing
the last used measurement display.
Press and hold for at least 4 seconds to switch off the sound level meter.
2.3 Setting Up the Sound Level Meter
✐Please note: Features and their settings will depend on your licence. Not all settings may be available on your sound
level meter.
Press on the sound level meter to enter the menu.
Navigate through the menu using the sound level meter's up/down ( / )
buttons.
To view specific settings, use the left/right ( / ) buttons.

Sound Level Meter Type 2245 – Instruction Manual
8
2.3.1 About
Go to About to see the sound level meter's serial number, hardware version,
firmware variant, and currently installed firmware version.
2.3.2 Measurement Settings
The acoustical frequency response and calibration depends on the sound field,
the microphone, the microphone accessories in use, and the electrical
frequency response. To improve the quality of the measurement and help the
user to measure correctly, the sound level meter compensates for the sound
field, the microphone, and the microphone accessories in use by automatically
changing the electrical frequency response and calibration.
⚑Hint: To ensure correct and good quality measurements, it is VERY IMPORTANT
that parameters in Measurement settings are correct.
Go to Measurement settings > Input to select:
•Microphone – to use (if more than one is specified in System settings >
Advanced settings > Microphones)
•Sound field – Select the sound field correction to apply, based on the type
of measurement you will make. The type of microphone is irrelevant. For
example, Microphone Type 4966 is afree-field microphone, but if you select
Diffuse-field, you can make correct measurements in a diffuse field.
Selecting Free-field will enhance the overall frequency response of the
system.
✐Please note: Generally, ISO requires free-field conditions and ANSI requires
diffuse-field conditions. Check your local standards for the setting you require.
No correction is made for an unknown microphone.
•Windscreen detect – Toggle Enabled/Disabled automatic detection of
Windscreen UA-1650 when mounted on the microphone preamplifier
•Windscreen type – Manually select type of windscreen, when Windscreen
Detect is Disabled

CHAPTER 2
Short Guide to the Sound Level Meter 9
Go to Measurement settings > Measurement control to set up how to control
your measurement:
•Logging mode – Select Enabled to log measurement data at every Logging
interval
•Logging interval – Define the logging interval when Logging mode is
Enabled. Select 1, 5, 10, 30 or 60 seconds
•Measurement time – Select either:
–Preset for the measurement to run for the specified Preset time
–Free to run until you press stop
•Preset time – Define the measurement time
•Back-erase mode – Select Enabled to overwrite all data from the specified
Back-erase time when continuing a paused measurement. Only available
when Logging mode is Disabled. When Back-erase is disabled,
measurement continues without overwriting data
•Back-erase time – Define the back-erase time, from 1to 10 seconds
Go to Measurement settings > Broadband parameters to select the frequency
weightings to use and the broadband parameters to measure.
Use the arrow keys on the sound level meter to navigate between the
selectable fields, press to select/deselect the parameter.
See details on measured broadband parameters in sections 2.13 and 2.14.
Go to Measurement settings > Spectrum parameters to select the:
•Bandwidth: (1/1-octave) or (1/3-octave)
•FrequencyWeighting: A, B, Cor Z
• Spectrum parameters: Select from those listed
Use the arrow keys on the sound level meter to navigate between the
selectable fields. Press to select/deselect the parameter.
See details on measured broadband parameters in sections 2.13 and 2.14.

Sound Level Meter Type 2245 – Instruction Manual
10
Go to Measurement settings > Statistical parameters to select the Basis
parameter for the statistics (LAeq, LAF, or LAS) and up to five percentiles.
See details on statistics in section 2.14.2.
Go to Measurement settings > Audio recording to enable audio recording in Listen quality (MP3 files).
2.3.3 Display Settings
Go to Display settings > Screen brightness and Display settings > Light ring
brightness to adjust the brightness of the screen and light ring on the sound
level meter, respectively.
Go to Display settings > Colour scheme to select either a Light or Dark scheme.
Use the rest of the Display settings to specify how to display your measurement
data. There is a view for each of the five possible displays to specify which
parameters to display, the maximum and minimum levels of the graphs, and
whether to enable t he view for display or no t. Here we only show the Spectrum
view.

CHAPTER 2
Short Guide to the Sound Level Meter 11
2.3.4 System Settings
Go to System settings to control regional settings, power settings, storage
settings, network settings, and advanced service settings.
Go to System settings > Regional settings > Language to select your preferred
user interface language.
Define the Time zone as a place, and then in the corresponding GMT+/– hours
will be shown.
The Date format and Time format can be defined here together with the type
of Date separator and Decimal point.
Set the Decimal places to 1or 2. This defines the number of digits after the
decimal point for result readings in dB values.
Go to System settings > Power management to define the duration of inactivity
before the display switches off, and the duration before the sound level meter
switches off.
✐Please note: Connecting the sound level meter to external power will always switch
it on and start charging.

Sound Level Meter Type 2245 – Instruction Manual
12
Go to System settings > Data management to set up backup settings for
automatic backup and data retention.
Set Data retention to Automatic or Manual: When set to Automatic, data that
has been transferred to the PC apps or backed up to a NAS disk/USB memory
stick will automatically be moved to the sound level meter's Trash.
With Retention period, define the amount of time data in Trash is retained. Data
will be removed from Trash when space is needed (that is, when more than 80%
of disk space is used).
Go to System settings > Data management > Backup settings to define how data
is automatically backed up. Back up either to:
• a USB memory stick – select the USB stick
• a NAS disk, a folder on a network drive, or on the hard disk on your PC –
select Disabled, then enter the necessary information
The data transfer will automatically start whenever the sound level meter is
connected to the defined backup system.
Go to System settings > Network settings to set up how to connect to the sound
level meter through a network.
The sound level meter has three network interfaces:
•Wi-Fi
®
• Ethernet through the USB-C™ connector
•Bluetooth
®(Bluetooth Low Energy)
Bluetooth is used for easy pairing of the smart device and sound level meter
and will automatically be switched on when Wi-Fi mode is set to Act as hotspot
or Connect to network.
Give your sound level meter a Nickname as identification (in addition to the
serial number) when accessing it from the interface.
You can also define a password for accessing the instrument through Wi-Fi or
Ethernet.
By enabling Web server display, you can see the display of the sound level
meter in an Internet browser by entering: the sound level meter's IP
address/display, for example 10.42.0.1/display.
Use Reset network settings to clear all network settings. The sound level meter
will forget all networks it was connected to.