Gracey & Associates Hire and Calibration
Bruel & Kjaer 2250 - BZ 7231 Specifications
To see the specifications for other available options, click a link
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BZ 7222 - Sound Analysis Software Specifications BZ 7223 - Frequency Analysis Software Specifications BZ 7224 - Logging Software Specifications BZ 7225 - Enhanced Logging Option Specifications BZ 7226 - Sound Recording Software Specifications BZ 7227 - Reverberation Time Option Specifications BZ 7228 - Sound Insulation Option Specifications BZ 7230 - FFT Analysis Option Specifications BZ 7231 - Tonal Assessment Option Specifications |
B&K 2250 - Main Page B&K 2250 - Specifications |
This is the BZ 7231 specifications page.
| B&K 2250 BZ 7231 | Tonal Assessment when used with the FFT option BZ 7230 | available for hire |
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Standard
Tone assessment is based on the measured FFT spectrum in accordance with ISO 1996:2007 Acoustics - Description, assessment and measurement of environmental noise - part 2:
Determination of environmental noise levels. Annex C (informative) Objective method for assessing the audibility of tones in noise - Reference method
Spectra Assessed
Any displayed sound FFT spectrum (FFT, Ref or Max) may be assessed.
Assessment is made as post-processing, i.e., when measurement is paused or stopped.
Setup According To Standard
Setup: Setups in violation of the standard are indicated as such on the display, you may then accept to apply the default setup
Tone assessment will be made if possible, in spite of standard violations.
Tone Seek Criterion: 0.1 to 4.0 dB in 0.1 dB steps.
Tone At Cursor
A sinusoidal tone is available at the Headphone output, to help confirm identified tones
Frequency: Selected by the Main cursor
Gain: -70 dB to +10 dB
Options: The generated tone may be mixed with the input signal, please refer to the Preferences/Headphone Settings.
Tone Assessment Cursor
All tones found are indicated in the display
The Tone cursor is initially placed at the most prominent tone, and may then be stepped through the tones found
You can also use the Main cursor to step through the tones.
Results
Results are displayed in the Tone Parameter panel and in the Value panel
They are not saved with the measurement.
All Tones: Frequency, Tone level Lpti, Masking noise level Lpn, Audibility Lta, Critical Band CB.
Most Prominent Tone: Tone Level Lpt, Adjustment Kt.
Quality Indicators
In the display, a quality indicator (smiley) will indicate that a hint is available for tone assessment quality. Click on the indicator to see the hint
1/3-octave Based Tone Assessment
Tone assessment is based on the measured 1/3-octave spectrum in accordance with either the international ISO1996:2007 Acoustics - Description, assessment and measurement of environmental noise - part 2: Determination of environmental noise levels.
Annex D (informative) Objective method for assessing the audibility of tones in noise - Simplified method or the Italian law DM 16-03-1998
Spectra Assessed
The displayed 1/3-octave spectrum (Leq, Lmax or Lmin) may be assessed. Assessment is made as post-processing, i.e., when measurement is paused or stopped
Setup According To Standard
Setups in violation of the standard are indicated as such on the display. You can then accept to apply the default setup. Tone assessment will be made if possible, in spite of standard violations. For tone assessment according to ISO1996-2, Annex D, you can set the division between the Low and Middle frequency range, the division between the Middle and High frequency range, and the limits for the level differences between adjacent bands.
For tone assessment according to DM16-03-1998, the tones are tested against loudness contours. Select between ISO226: 1987 Free-field, 1987 Diffuse-field and 2003 Free-field
Results Tones are indicated above the spectrum when Tone is selected as spectrum parameter. The resulting adjustment can be viewed on the Value panel. It is not saved with the measurement
Quality Indicators
On the display, a quality indicator (smiley) will indicate that a hint is available for tone assessment quality. Click on the indicator to see the hint
E&OE - specifications subject to change without notice.
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