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Sound and Vibration Instrument Hire and Calibration

B&K 2250 Tone Assessment Specifications


To see the specifications for the various options available, click a link

Bruel & Kjaer Sound Level Meter
 
BZ 7222 : Sound Analysis Software
BZ 7223 : Frequency Analysis Software
BZ 7224 : Logging Software
BZ 7225 : Enhanced Logging Option
BZ 7226 : Sound Recording Software
BZ 7227 : Reverberation Time Option
BZ 7228 : Sound Insulation Option
BZ 7230 : FFT Analysis Option
BZ 7231 : Tone Assessment Option
 
B&K 2250 : Home Page
B&K 2250 : Specifications
B&K 2250 : Detailed Image
 
Bruel & Kjaer 2250 + Tone Assessment BZ 7231 and FFT option BZ 7230 £ 40 a day *
 

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 ISO 1996:2007 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 ISO 1996-2, 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 BS ISO 226: 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.
* Our standard hire charges are based on a 4-day minimum period, details other options.

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