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PRODUCT DATA

Hand-held Building Acoustics Analyzer Types 2250 and 2270 with Building Acoustics

Software BZ-7228

Building Acoustics is the assessment of sound insulation in

buildings and building elements. It is important for the well-being of

people in their homes, workplace or public venues, thus minimum

standards are set in the building regulations of each country.

BZ-7228 software is available for Hand-held Analyzers Type 2250

and Type 2270. It provides the flexibility, ease of use and

confidence in your results that field measurements require in

building acoustics.

Type 2270 users can turn their analyzer into a 2-channel building

acoustics analyzer with 2-channel Option BZ-7229.

Back at the office, Qualifier Type 7830 and PULSE Reflex Building

Acoustics Type 8780 offers versatile post-processing and reporting

of your measurement results.

Uses and Features

Uses (BZ-7228)

• Measurement of:

– Airborne sound insulation

– Façade sound insulation

– Impact sound insulation

Features (BZ-7228)

• Complete hand-held building acoustics analyzer

• Measures source and receiving room level spectra

– Built-in pink and white noise generator

– Equalisation of sound source spectra

– Parallel or serial measurements

• Measures reverberation time spectra:

– Impulse and Interrupted Noise methods

– Built-in pink and white noise generator

• Measurement position management

• Calculates final results on the spot: ISO plus

12 national standards

• Measurement quality indicators

• Colour touch screen user interface

• Signal recording, voice commentary and integrated camera

(Type 2270 only) to document test environment

• Single-channel measurements (Type 2250 and 2270)

• 2-channel measurements (Type 2270 only, with BZ-7229)

Uses (Type 7830 or Type 8780)

• Building acoustics calculation

• Report generation

• Data archiving

Features (Type 7830 or Type 8780)

• Building acoustics results calculation

• Analysis and report generation in one application

(Type 8780 incorporates Microsoft

Office)

• Automatic data integrity checking

• Before and after scenario combination and comparison in one

project (Type 8780 only)

• ISO plus 12 national standards

Summary of content (16 pages)

PAGE 1
PRODUCT DATA Hand-held Building Acoustics Analyzer Types 2250 and 2270 with Building Acoustics Software BZ-7228 Building Acoustics is the assessment of sound insulation in buildings and building elements. It is important for the well-being of people in their homes, workplace or public venues, thus minimum standards are set in the building regulations of each country. BZ-7228 software is available for Hand-held Analyzers Type 2250 and Type 2270.
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The Hand-held Analyzers Types 2250 and 2270 are robust, hand-held anayzer platforms designed to host a wide range of sound and vibration measurement applications. Their uses range from assessing environmental and workplace noise to industrial quality control and product development (Product Data BP 2025). Fig. 1 Hand-held Analyzers Type 2250 and 2270 Easy to use – their light and ergonomic design make them easy to grip, hold and operate single-handedly.
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The sound level depends on the position in the rooms, so several microphone positions are used to measure the average of the source room level, L1, the average of the receiving room level L2 and the average of the background noise level B2. The average reverberation time T2 is also measured using several positions. In Touch with your Measurements The spectra required (L1, L2, etc.,) may be measured in any order, to suit field conditions and your preferences. Fig. 4, Fig. 5 and Fig.
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Press the Save pushbutton to save the measurement (see Fig. 5, right). You are now ready to measure at position 2. Fig. 6 Left: Typical 2-channel inspection phase – Façade Sound Insulation is measured with traffic noise as a source. This is indicated by the car ‘traffic’ icon Centre: 2-channel save phase – overview Right: Type 2270 connected to two microphones through the Dual 10-pole Adaptor 2-channel measurements (Type 2270 only) are as easy as single-channel measurements. In Fig.
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Fig. 8 Reverberation time spectrum (left); reverberation decay curve (centre); and overview of results (right) NOTE: A dedicated Reverberation Time Software module (BZ-7227) is also available. Please contact your Brüel & Kjær representative for details. Calculations Standards Even though the measurement functions (L1, L2, B2, T2) are the same for any building acoustics measurement, the detailed measurement setup and calculation procedures depend on your national building regulations.
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Other Tasks Façade Sound Insulation Façade sound insulation is a variant of airborne sound insulation, with its own standards. The “source room” is the space outside the facade, and the sound source may be road traffic or a loudspeaker representing outdoor noise. When using traffic noise, the indoor and outdoor sound levels must be measured simultaneously, requiring 2-channel measurements (Type 2270 only). The outdoor microphone positions are flush with the facade, or 2 m in front of it.
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Fig. 11 Typical building acoustics project using Type 8780. Data are presented graphically and numerically with detailed data quality indications, using Type 2250/2270’s smiley system The tabular Data Editor (at the bottom of the screen) presents all measured data and calculation results in detail and provides the controls to refine data as well as to select which measurements to include in the final analysis of a partition.
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Reviewing and Reporting using Qualifier Type 7830 With Qualifier Type 7830, you can view, recalculate, document and report data. View measured and calculated data just as with Type 2250/2270. Qualifier’s user interface provides a Project Tree for easy browsing and copy/paste across data folders. Selected data can be displayed as tables, 3D plots and graphs.
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Table2 Calculated parameters Measurement Standards ISO, DIN, ÖNORM, UNI, BS, BREW SS Sia NF ISO 140 ISO 717 ISO 140 ISO 717 ISO 140 ISO 717 D Dn DnT R´ R ISO plus: ISO plus: Dw8 DnTw8 R´w8 Rw8 Basic Standards: Airborne Calculated parameters: Façade 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 See ISO Calculated parameters: L´nt L´nT Ln L´nw L´nTw or
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Fig.
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Specifications – Type 2250/2270 Microphone SUPPLIED MICROPHONE Type 4189: Prepolarized Free-field ½″ Microphone or Type 4190: Free-field ½″ Microphone Nominal Open-circuit Sensitivity: 50 mV/Pa (corresponding to −26 dB re 1 V/Pa) ± 1.5 dB Capacitance: 14 pF (at 250 Hz) MICROPHONE PREAMPLIFIER ZC-0032 Nominal Preamplifier Attenuation: 0.
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40°C charging time will be prolonged. With external charger ZG-0444 (optional accessory), typically 5 hours NOTE: It is not recommended to charge the battery at temperatures below 0°C (32°F) or over 50°C (122°F). Doing this will reduce battery lifetime CLOCK Back-up battery powered clock. Drift < 0.
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Linear Operating Range: In accordance with IEC 61672, A-weighted: 1 kHz: Single Range: 24.8 to 140 dB High Range: 43.0 to 140 dB Low Range: 24.8 to 110 dB Frequency Analysis CENTRE FREQUENCIES 1/1-octave Band Centre Frequencies: 63 Hz to 8 kHz 1/3-octave Band Centre Frequencies: 50 Hz to 10 kHz MEASURING RANGES When using Microphone Type 4189: Dynamic Range: From typical noise floor to max. level for a pure tone signal at 1 kHz 1/3-octave: Single Range: 1.1 to 140 dB High Range: 11.
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Measurement Control Calibration Measurement Sequence: Supports measuring: • at all microphone positions before using another source • at a microphone position for all sources before measuring at a new position • at subsequent microphone positions without source information • at manually selected source and microphone positions Measurements are started manually and can be automatically stored on completion of measurement Generator (L1, L2 and T2): The noise generator is turned on and off automatically Esca
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Specifications – PULSE Reflex Building Acoustics Type 8780 PULSE Reflex Building Acoustics is the software package for postprocessing and reporting of building acoustics measurements made with Type 2250/2270.
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Ordering Information Accessories for upgrading a BZ-7228-200 or BZ-7228-300 kit to a 2-channel building acoustics kit: • Prepolarized Free-field 1/2″ Microphone Type 4189 • Microphone Preamplifier ZC-0032 • Dual 10-pole Adaptor JP-1041 • Microphone Extension Cable AO-0697-D-100, 10-pin LEMO, 10 m (33 ft) • 2-Channel Option BZ-7229 Software and Accessories Available Separately SOFTWARE MODULES BZ-7228 Building Acoustics Software for Types 2250 and 2270 BZ-7228-100 Upgrade of BZ-7227 Reverberation Time soft