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Sound and Vibration Instrument Hire and Calibration

B&K 2250 BZ 7223 Frequency Analysis 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 : Frequency Analysis Software - BZ 7223 included

Conforms with BS EN 61260-1:2014


Centre Frequencies

1/1-octave Band Centre Frequencies: 8Hz to 16 kHz
1/3-octave Band Centre Frequencies: 6.3Hz to 20 kHz


X = frequency weightings A, B, C or Z
Y = time weightings F or S

Data for Storage

Full Spectral Statistics

Spectra for Display and Storage

LXeq LXSmax LXFmax
LXSmin LXFmin  

Spectra for Display Only


NRNR Decisive Band  
RCRC Classification  
NCBNCB Classification  
LoudnessLoudness Level  
Where f1 and f2 are frequency bands in the spectrum.

Measuring Ranges

When using a Microphone Type 4189
Dynamic Range: From typical noise floor to max. level for a pure tone signal at 1 kHz 1/3-octave: 1.7 to 140 dB
Linear Operating Range: In accordance with IEC 61260 <20.5 dB to 140 dB.

Sampling for Octave or 1/3-octave Statistics

X = frequency weightings A or B
The Statistics can be based on either LXF or LXS:
Statistics LXFN1-7 or LXSN1-7 are based on sampling LXF or LXS, respectively, every T ms into 1 dB wide classes over 150 dB;
T = 100 for frequency range set to 12.5 - 20 kHz
T = 200 for frequency range set to 6.3 - 20 kHz
Full distribution can be saved with measurement

Measurement Displays

Spectrum: One or two spectra superimposed + A/B and C/Z broadband bars
Y-axis: Range: 5, 10, 20, 40, 60, 80, 100, 120, 140 or 160 dB. Auto zoom or auto scale available
Cursor: Readout of selected band


Readout of selected band

Internal Generator

Built-in pseudo-random noise generator
Spectrum: Selectable between Pink and White
Crest Factor:
Pink Noise: 4.4 (13 dB)
White Noise: 3.6 (11 dB)
Bandwidth: Selectable
Lower Limit: 50 Hz (1/3-oct.) or 63 Hz (oct.)
Upper Limit: 10 kHz (1/3-oct.) or 8 kHz (oct.)
Output Level: Independent of bandwidth
Max: 1 Vrms (0 dB)
Gain Adjustment: -60 to 0 dB
When bandwidth is changed, the level for all bands is automatically adjusted to comply with the set output level
Correction Filters: for sound sources Type 4294, Type 4295 and Type 4296: Flat or Optimum.
Repetition Period: 175 s
Output Connector: Output Socket

External Generator

Selectable as alternative to Internal generator
To control external noise generator, set:
Levels: 0 V (Generator off), 4.5 V (Generator on)
Rise-time and Fall-time: 10 µs
The noise generator is turned on and off automatically during the measurement.
Escape Time: 0 to 60 s
Build-up Time: 1 to 10 s
The generator can be turned on and off manually for checking equipment and sound levels
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E&OE - specifications subject to change without notice.