Gracey & Associates Hire
B&K 2250 Sound Insulation Measurement Option - BZ 7228
The B&K 2250 is a multi-function meter, for other options and accessories click a link
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B&K 2250 - Home Page B&K 2250 - Summary Table B&K 2250 - Specifications Options and software included BZ 5503 - PC - Utility Software BZ 7222 - Sound Analysis Software BZ 7223 - Frequency Analysis Software BZ 7224 - Logging Software BZ 7226 - Sound Recording Software |
Other options available BZ 7225 - Enhanced Logging Software BZ 7227 - Reverberation Time Software BZ 7228 - Sound Insulation and Calculation - this page BZ 7230 - FFT Measurement Software BZ 7231 - Tonal Assessment Software |
| Accessories etc., Environmental and Factory Noise Kits + Building Acoustics Kits |
| B&K 2250 with BZ 7228 Building Acoustics Software option | £ 36 a day * |
On this page we describe the main features of the BZ 7228 Sound Insulation Measurement option for ease of use and the confidence in your results that field measurements require in building acoustics. Measurements comply with the relevant parts of ISO and British Standards
Uses
Measurement of:
♦ Airborne sound insulation
♦ Facade sound insulation
♦ Impact sound insulation
Features
♦ 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
♦ 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
♦ Sound recording, voice commentary to document test environment
♦ Single-channel measurements
♦ Complete systems available including airborne and impact sound sources
Tasks in Building Acoustics
The most common task in building acoustics measurements is airborne sound insulation.
A typical measurement requires a B&K 2250 + BZ 7228 software option with a power amplifier/loudspeaker, see our kits below.
A number of measurements are taken in the source room, at different positions in the room and the spectrums averaged by the type 2250 to arrive at the Source Room Spectra L1. *
A similar number of measurements, typically 6, are averaged in the receiving room to arrive at the Receiving Room Spectra L2. *
The average background noise spectrum B2 is also measured in the receiving room to ensure the background noise did not effect the L2 spectrum.
* After each measurement the spectrum may be inspected before saving to the average register. A yellow 'smiley' icon indicates you may be able to improve the measurement in one of the frequency bands. Tap the icon for more details and/or press the Save push-button and move on to the next position.
Finally the average reverberation time spectrum T2 is measured, to correct for the amount of absorption in the receiving room. Finally the single number result (for example DnTw) is calculated from the L1, L2, B2 and T2 spectra, and the result can then be compared with the minimum requirements stated in the building regulations.
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. To ensure that your measurements comply, select the relevant standard before you save your first measurement. This will automatically activate the required setup for measurement and calculation.
Results
In addition to measurement data, you may also need the receiving room volume and the partition area for some calculations. These can of course be entered using the stylus/navigation push-buttons on the appropriate instrument display page. You may want to reuse some of your earlier measurements (like a T2 spectrum known from a similar receiving room), to save time. This is also possible, by using a re-use facility in the Explorer display. The calculations use a reference curve for frequency weighting of the sound reduction spectrum, resulting in a single number like R'w = 52 dB (the weighted field sound reduction index according to the BS EN ISO 140-4). This means you will know on site if your construction under test fulfills the minimum requirements of the local building regulation.
Result Example
Once the required data is measured, the results are shown, including the reference curve. For some results the volume of the receiving room and the area of the partition must be entered
Other Tasks
Impact Sound Insulation
Impact sound is typically caused by footsteps, and to measure impact sound insulation a standardised impact sound source (tapping machine) is placed in the source room. The receiving room levels are measured as for airborne sound insulation, with several positions of the tapping machine. Calculations are like those for airborne sound insulation, except the results represent absolute (not relative) levels.
Click here to see the B&K 2250 Sound Insulation Measurement Specifications.
Popular Accessories.
| B&K 3207 | Tapping - impact machine |
| B&K 4230 | Acoustic calibrator - class 2 |
| B&K 4231 | Acoustic calibrator - class 1 |
| B&K 7830 | Qualifier Software - NEW 2008 |
| B&K AO 0441 | Cable - microphone extension - 10-pin Lemo, 3 m long |
| B&K AO 0524 | Cable - 2260 noise generator signal out to BNC - 10 m long |
| B&K VP 7670 | PC Software - B&K Link for Windows |
| GA 80G1-00 | Meter stand 0.4 - 1.45 m high |
| Nor 250 | Hemi-dodecahedron Speaker - 200W 120 dB - needs power amplifier |
| Nor 260 | Power Amplifier with built-in noise generator - ideal for use with the Nor 250 |
| Nor 280 | Power Amplifier with built-in noise generator - ideal for use with the Nor 250 |
SPECIAL OFFER - order a building acoustics kit and get the analyzer half price.
Building Acoustics Kits.
| B&K 2250 | Building Acoustics Airborne Kit - 120 dB SWL - special kit price | £ 42 a day * |
| B&K 2250 | Building Acoustics Analyzer, as above | |
| B&K AO 0524 | Cable - 2260 noise generator signal output - 10 m long to BNC | |
| GA 80G1-00 | Meter stand 0.4 - 1.45 m high | |
| Nor 250 | Hemi-dodecahedron Speaker - 200W 120 dB | |
| Nor 260 | Power Amplifier for use with the Nor 250 |
| B&K 2250 | Building Acoustics Airborne + Impact Kit - special kit price | £ 57 a day * |
| B&K 2250 | Building Acoustics Airborne Kit, as above |
| B&K 3207 | Tapping - impact machine |
* Our standard hire charges are based on a 4-day minimum period - details and other options.
- Gracey & Associates 01933 624212
- BSI accreditation for instrument hire and calibration
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B&K Help Line - 01763 255780