Brüel & Kjær Hand-held Analyzers 2250/2270 for Building Acoustics
Product Data Sheet
Introduction
Building Acoustics is the assessment of sound insulation in buildings and building elements, crucial for occupant well-being and adherence to minimum standards set by building regulations. The Brüel & Kjær (HBK) Type 2250 and Type 2270 hand-held analyzers, coupled with the BZ-7228 Building Acoustics Software, offer a flexible and user-friendly solution optimized for field measurements.
The Type 2270 analyzers, when equipped with the 2-channel Option BZ-7229 (standard on new units), function as 2-channel building acoustics analyzers. For post-processing and reporting, the Qualifier Type 7830 provides versatile tools. For users solely requiring reverberation time measurements, the BZ-7227 Reverberation Time Software is also available.
Uses and Features
Uses (BZ-7228)
- Measurement of:
- Airborne sound insulation
- Facade sound insulation
- Impact sound insulation
Features (BZ-7228)
- Complete hand-held building acoustics analyzer
- Built-in pink and white noise generator
- Measures source and receiving room level spectra, including equalization of sound source spectra and parallel or serial measurements
- Measures reverberation time spectra using Impulse and Interrupted Noise methods
- Measurement position management
- Calculates final results on-site according to ISO 16283, ISO 140, and 13 national standards
- Measurement quality indicators
- Colour touch screen user interface
- Signal recording, voice commentary, and integrated camera (Type 2270 only) for documenting test environments
- Supports single-channel measurements (Types 2250 and 2270)
- Supports 2-channel measurements (Type 2270 only, requires BZ-7229)
Uses (Type 7830)
- Building acoustics calculation
- Report generation
- Data archiving
Features (Type 7830)
- Building acoustics results calculation
- Analysis and report generation in a single application
- Automatic data integrity checking (indicated by smileys ?)
- Supports ISO and 13 national standards
The Hand-held Analyzers
Figure 1: Depicts the Brüel & Kjær Hand-held Analyzer Types 2250 and 2270.
The Type 2250 and 2270 are robust, hand-held analyzer platforms designed for a wide range of sound and vibration measurement applications, from environmental and workplace noise assessment to industrial quality control and product development.
Their ergonomic design makes them easy to grip and operate single-handedly. High-resolution colour touch screens display setup, status, and data at a glance. A central "traffic light" indicator provides immediate visual feedback on the current measurement status.
These analyzers are built for demanding field environments, offering reliable performance in rain, dust, heat, and frost, day or night.
Users can document measurements with spoken or written comments and signal recordings (requires Signal Recording Option BZ-7226).
The Type 2250 is a single-channel analyzer, while the Type 2270 offers 2-channel capability and an integrated camera for attaching photos to measurements.
Tasks in Building Acoustics
Figure 2: Illustrates a typical configuration for building acoustics measurements, including a sound source, amplifier, analyzer (with signal generator), and PC for reporting.
This configuration is commonly used for airborne sound insulation measurements. The process involves using a loudspeaker to emit pink noise and placing microphones at various positions to measure the average source room spectrum (L1) and receiving room spectrum (L2). The background noise spectrum (B2) is also measured. Reverberation time (T2) is measured to account for room absorption. Finally, a single number result (e.g., DnTw) is calculated and compared against building regulation requirements.
In Touch with your Measurements
Figure 3: Shows sound source and microphone positions for measuring airborne sound insulation, illustrating L1 (Source room level), L2 (Receiving room level), B2 (Background level), and T2 (Reverberation Time).
Sound levels vary by room position, necessitating multiple microphone placements to determine average levels (L1, L2, B2) and reverberation times (T2).
Measurements can be performed in any order suitable for field conditions. Figure 4 displays a typical single-channel spectrum view for measuring the first L2 position with source position 1. Figure 5 shows a typical single-channel overview display.
The high-resolution colour touchscreen provides instant feedback on setup, status, and data. Users can interact with indicated features via stylus or navigation buttons. The generator and loudspeaker signal levels can be checked by tapping the Generator icon.
Reverberation Time
Figure 6: Shows the Type 2270 connected to two microphones via a Dual 10-pole Adaptor.
2-channel measurements with the Type 2270 streamline the process, allowing simultaneous measurements of source and receiver positions or multiple positions within the same room, reducing overall measurement time.
Figure 7: Depicts a reverberation time measurement using the interrupted noise method.
Reverberation time (RT) is a key parameter for assessing room acoustics, influencing sound levels, speech intelligibility, and music perception. In building acoustics, it's used to correct sound power measurements. RT is the time for a 60 dB sound level drop, typically measured over a 20 or 30 dB drop and extrapolated (T20 and T30).
RT varies by position, so multiple measurements are averaged. Measurements can be made using impulsive excitation (e.g., pistol shot, balloon burst) or interrupted noise. The process is simple: press Start/Pause. Reverberation times from 0.1 to 30 seconds are measured at peak sound levels up to 143 dB. A "traffic light" indicator confirms measurement status.
Figure 8: Shows a reverberation time spectrum (T20/T30), a reverberation decay curve, and an overview of results.
Calculations and Results
Figure 9: Illustrates the display of final results, including the reference curve, after required data has been measured. For certain calculations, the receiving room volume and partition area must be entered.
Measurement functions (L1, L2, B2, T2) are consistent, but setup and calculation procedures depend on national building regulations. Selecting the relevant standard ensures correct setup. An overview of supported standards is in Table 1, and calculated parameters in Table 2.
Results may require entering receiving room volume and partition area. Earlier measurements can be reused via the Explorer display to save time.
Calculations use a reference curve for sound reduction spectrum weighting, yielding a single number like R'w (weighted field sound reduction index per ISO 140-4). This allows on-site verification against local building regulation minimums.
Other Tasks
Facade Sound Insulation
This is a variant of airborne sound insulation, often measuring road traffic or loudspeaker noise as the source outside the facade. Simultaneous measurement of indoor and outdoor levels is required, necessitating 2-channel measurements (Type 2270 only).
Impact Sound Insulation
Measured using a standardized impact sound source (tapping machine) in the source room. Receiving room levels are measured similarly to airborne sound insulation, with calculations representing absolute levels.
Wireless Systems
Figure 10: Shows optional wireless systems for controlling sound sources in airborne and impact sound insulation measurements.
The Wireless Audio System Kit UL-0256 simplifies measurements by reducing cables and enabling remote amplifier control.
Reviewing and Reporting using Qualifier Type 7830
Figure 11: Displays a typical building acoustics project using Type 7830.
Qualifier Type 7830 allows users to view, recalculate, document, and report data. Its Project Tree facilitates easy navigation and data management. Data can be presented in tables, 3D plots, and graphs, with editing options for decay alignment, manual entries, and standard changes.
Customizable templates are available for reporting calculations according to national and international standards, including company logos.
Building Acoustics Measurement Standards
Table 1: Lists building acoustics standards supported by BZ-7228 and Qualifier Type 7830 across various countries (International, Germany, Austria, Italy, UK, Sweden, France, Spain, Netherlands, USA) for Airborne, Facade, and Impact measurements.
Key standards include ISO 16283, ISO 140, ISO 717, and national equivalents.
| Measurement | ISO | DIN | ÖNORM | UNI | BS | BREW | SS | SIA | NF | NBE | CTE | NEN | NEN'06 | ASTM |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Typical Parameters | R', DnT, L'n | R | DnT | Dn | DnT | DnT | R' | DnT | DnAT | DnAT | DnT,A | llu | DnT,A | FTL |
| AIRBORNE | ||||||||||||||
| Lab | 10140-2* | EN 20140-3 | S5101 | 8270-1 | EN 20140-3 | EN 20140-3 | 051 | 74-040-84/3 | CTE 2008 | |||||
| Field | 140-4, 16283-1 | 52210-1 | S5100-1 | 8270-4 | 2750-4 | BREW | EN 20140-4 | 181, 054, -057 | 74-040-84/4 | CTE 2008 | 5077 | 5077 | E336-90 | |
| Facade | 140-5, 16283-1 | 52210-5 | S5100-3 | 8270-5 | 2750-5 | EN 20140-5 | 181, 055, -057 | 74-040-84/5 | CTE 2008 | 5077 | 5077 | E966-90 | ||
| Lab | 10140-3* | 52210-1 | S5101 | 8270-6 | 2750-6 | EN 20140-6 | -052 | 74-040-84/6 | CTE 2008 | |||||
| Field | 140-7, 16283-2, 3382-2, 52212 | 52210-1 | S5100-2 | 8270-4 | 2750-7 | EN 20140-7 | 181, 056, -057 | 74-040-84/7 | CTE 2008 | 5077 | 5077 | E1007-11 | ||
| RATING RT IMPACT | ||||||||||||||
| Airborne | 717-1 | 52210-4 | S5100-1 | 8270-7 | 5821-1, -3 | BS EN 717-1 | SS ISO 717-1 | 181, -057 | NBECA-88 | CTE 2008 | 5077 | NPR 5079 | E413-73, E1332-90 | |
| Impact | 717-2 | 52210-4 | S5100-2 | 8270-7 | 5821-2 | SS ISO 717-2 | 181, -057 | NBECA-88 | CTE 2008 | 5077 | E989 |
* Partially fulfilled (does not support correction of the result for the contribution of flanking transmission).
Calculated Parameters
Table 2: Details calculated parameters for Airborne, Facade, and Impact measurements, referencing various international and national measurement standards.
| Basic Standards | MEASUREMENT STANDARDS | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ISO, DIN, ÖNORM, UNI, BS, BREW | SS | SIA | NF | NBE | CTE | NEN | NEN'06 | ASTM | |||||||
| Airborne | ISO 16283*, ISO 140, ISO 717 | ISO 140, ISO 717 | ISO plus: DnT | NF S31-05X | ISO plus: DA, DnAT, RA, R'A | ISO plus: DA, DnAT, RA, R'A | ISO plus: DnT45 | ISO plus: DnTtr | ISO plus: | ISO plus: | NEN | NEN 5077, 5077-2006 | ASTM E336, 1007, E966, E1332 | ||
| Calculated Parameters | D, DnT, R' Dw, Dw+C, Dw+Ctr Dnw, Dnw+C, Dnw+Ctr DnTw, R'w or Rw +C, +Ctr +C50-3150, +C50-5000 +C100-5000, +Ctr50-3150 +Ctr100-5000, +Ctr50-5000 R'45°, R'tr,s Dls,2m, Dls,2m,n, Dls,2m,nT Dtr,2m, Dtr2m,n, Dtr,2m,nT Dls,2m,w, Dls,2m,n,w Dls,2m,nT,w, Dls,2m,nT,w+C Dls,2m,nT,w+Ctr Dtr,2m,w, Dtr,2m,n,w Dtr,2m,nT,w+C Dtr,2m,nT,w+Ctr |
ISO plus: Dw8, DnTw8, R'w8, Rw8 DnTw+C-Cv |
DnT, DnAT, DnATrose Rrose, Rroute |
ISO plus: DnATroute |
ISO plus: DA, DnAT, RA, R'A |
ISO plus: DA, DnA, DnT,A RA, R'A |
ISO plus: DnT45° |
ISO plus: DnTtr |
ISO plus: DnATroute45° |
ISO plus: R'45°, R'45°A, R'45°Aav R'45°Aef, R'45°Atr R'A, R'Atr |
NEN DnT,A, Ilu Ilu;k, DnT,A,k |
NEN 5077, 5077-2006 NIC, NNIC |
FTL DnT,A FSTC |
||
| Facade | |||||||||||||||
| Calculated Parameters | DnT R'w or Rw +C +Ctr +C50-3150 +C50-5000 +C100-5000 +Ctr50-3150 +Ctr100-5000 +Ctr 50-5000 R′45° R′tr,s Dls,2m Dls,2m,n Dls,2m,nT Dtr,2m Dtr2m,n Dtr,2m,nT Dls,2m,w Dls,2m,n,w Dls,2m,nT,w Dls,2m,nT,w+C Dls,2m,nT,w+Ctr Dtr,2m,w Dtr,2m,n,w Dtr,2m,nT,w+C Dtr,2m,nT,w+Ctr |
See ISO | ISO plus: DnT45° |
ISO plus: DnTtr |
ISO plus: DnATroute45° |
ISO plus: R'45° |
ISO plus: Dls,2m,nAT Dtr,2m,nAT |
ISO plus: D2m,A D2m,Aav D2m,Aef D2m,Atr D2m,n,A D2m,n,Aav D2m,n,Aef D2m,n,Atr D2m,nT,A D2m,nT,Aav D2m,nT,Aef D2m,nT,Atr |
Gi | Gi | OILR | OITL | GA, GA;K | GA, GA;K | OITC |
| Impact | |||||||||||||||
| Calculated Parameters | L'nT, Ln | See ISO | ISO plus: L'nw, L'nTw or Lnw +Ci, +Ci50-2500 |
ISO plus: L'nw8, L'nTw8 |
ISO plus: LnT, Ln |
ISO plus: LnT, Ln |
LnAT, LnA | LnAT | Ico | IIC, NISR | |||||
* ISO 16283: Additional low-frequency measurement procedure for low frequencies in small rooms. The LCorner and LLF results are used for calculating and displaying the final results.
Complete System
HBK offers a range of Brüel & Kjær accessories to build a comprehensive building acoustics measurement system, including power amplifiers, sound sources, tapping machines, tripods, cables, microphones, wireless systems, and calibrators. The required accessories depend on the specific measurement setup.
Figure 12: Illustrates various accessories for building acoustics measurements, such as microphones (Type 4189), preamplifiers (ZC-0032), power amplifiers (2734-B), sound sources (4292-L), tapping machines (3207), software (Type 7830), and various cables and adapters.
Accredited Calibration Services
HBK provides accredited calibration services for Type 2250/2270 analyzers, ensuring traceable measurement history. Calibration is recommended biannually or annually by an ISO 7025 certified laboratory.
Compliance with Environmental Standards
The products comply with various safety, EMC, temperature, humidity, and mechanical standards, including CE marking, RCM mark, China RoHS, WEEE Directive, EN/IEC 61010-1, EN/IEC 61000-6-3, EN/IEC 61326, IEC 61672-1, IEC 61260, IEC 60651, IEC 60804, and environmental testing standards like IEC 60068-2-1, IEC 60068-2-2, IEC 60068-2-78, IEC 60068-2-6, IEC 60068-2-27, and IEC 60529.
General Specifications
Transducer
Supplied microphones include Type 4189, 4190, and 4966 (Free-field). Nominal open-circuit sensitivity is 50 mV/Pa. Capacitance is 14 pF.
Supplied microphone preamplifier is Part No. ZC-0032 with 0.25 dB attenuation and 10-pin LEMO connector. Extension cables up to 100 m are supported.
Microphone polarization voltage is selectable (0 V to 200 V).
Self-generated noise levels are provided for different weightings (A, B, C, Z).
Hardware Interface
Features 11 backlit pushbuttons for measurement control and screen navigation. An ON-OFF button controls power states. Status indicators (LEDs) show measurement status. The display is a transflective back-lit colour touchscreen (240x320 dots) with adjustable backlight and multiple colour schemes.
User interface allows control via pushbuttons and stylus. Pushbuttons and touchscreen can be locked.
Includes USB 2.0 OTG Micro AB and Standard A sockets for accessories. Modem interface supports internet connection. Printer interface supports PCL, Mobile Pro Spectrum, and Seiko printers.
An integrated microphone is available for voice annotations, and an integrated camera (Type 2270 only) for image annotations.
Includes Secure Digital (SD/SDHC) sockets, LAN interface, Input sockets (Triaxial LEMO), Trigger socket, Output socket, and Headphone socket.
Storage
Internal Flash-RAM (512 MB) for user setups and data. External memory via SD/SDHC cards and USB memory sticks.
Power
External DC power supply requirements (8-24 V DC). External AC main supply adaptor (ZG-0426). Rechargeable Li-Ion battery (QB-0061) with typical capacity of 5500 mAh, offering over 10 hours of operating time.
Software Interface
Users
Multi-user concept with login, allowing independent settings for jobs and projects.
Preferences
User-definable date, time, and number formats.
Language
User interface available in Catalan, Chinese (PRC, Taiwan), Croatian, Czech, Danish, English, Flemish, French, German, Hungarian, Japanese, Italian, Korean, Polish, Portuguese, Romanian, Russian, Serbian, Slovenian, Spanish, Swedish, Turkish, and Ukrainian.
Help
Concise, context-sensitive help available in multiple languages.
Update of Software
Software updates via USB or Internet using BZ-5503.
Remote Access
Connect via Measurement Partner Suite BZ-5503, 2250/2270 SDK, REST interface, or internet browser. Password protection with Guest and Administrator levels.
Input
Dual Channels (Type 2270 only) for simultaneous measurements.
Transducer Database stores transducer information for automatic hardware setup.
Correction Filters compensate for sound field and accessories.
Calibration
Initial calibration stored for comparison. Acoustic calibration uses Sound Calibrator Type 4231. Electrical calibration uses an internal electrical signal.
Calibration History lists up to 20 previous calibrations.
Data Management
Metadata annotations (up to 30 per project). Project Templates define and lock set-ups. Projects organized in jobs with Explorer for data management (copy, cut, paste, delete, rename). Data reuse is supported.
Measurement Control
Supports various measurement sequences. Generator (L1, L2, T2) operates automatically or manually. Excitation T2 (Interrupted Noise, Impulse) allows manual start and automatic recording. Signal Recording (Option BZ-7226) captures Z-weighted signals. Back-Erase function removes last 5 seconds of data.
Measurement Displays
Displays include Overview (measurement positions), Sound Level Spectrum (LZF, LZeq), Reverberation Time Spectrum, and Spectrum Table.
Result Displays
Overview shows measurement positions and quality indicators. Calculations display sound reduction index and reference curves. Signal Monitoring allows input signal monitoring via headphones.
Software Specifications – Building Acoustics Software BZ-7228
Specifications apply to BZ-7228, with 2-channel Option BZ-7229 for Type 2270.
Standards
Conforms to IEC 61672-1, IEC 60651, ANSI S1.4, IEC 61260, ANSI S1.11, and ISO 16283 standards, among others.
Broadband Analysis
Detectors include A- and C-weighted with Fast exponential time weighting. Overload and Underrange detectors are included.
Measurements
LAF and LCF displayed as numbers or bars. Measuring ranges are specified for Type 4189 microphone.
Frequency Analysis
Centre frequencies for 1/1-octave and 1/3-octave bands are listed. Measuring ranges are detailed.
Internal Generator
Built-in pseudo-random noise generator with selectable Pink or White spectrum. Bandwidth and output level are configurable.
External Generator
Option to use an external generator.
Specifications – Qualifier Type 7830
Supports standards listed in Tables 1 and 2. Available languages for interface: English, French, German, Italian, Spanish.
Features various views (Result Level, Average Level, Position Level), cursor read-out, manual input for adjustments, calculations for insulation and reverberation, report generation, and data transfer via USB.
Minimum PC requirements are specified.
Ordering Information
Building Acoustics Kits
Kits are available for single-channel building acoustics measurements (BZ-7228-200) and single-channel airborne or impact sound insulation (BZ-7228-300), including software, amplifiers, sound sources, cables, and tripods.
Two-channel measurements for Type 2270 users require the BZ-7229 2-channel Option and additional accessories.
Software and Accessories Available Separately
Lists various software modules (BZ-7228, BZ-7229, BZ-7226, etc.), PC software (Type 7830), measurement accessories (rotating microphone boom, sound calibrator, cables), sound sources (4292-L, 3207), power amplifiers (2734-A, 2734-B), and interfacing components.
Also lists accredited calibration services and hardware maintenance options.
