Sound and Vibration Instrument Hire and Calibration
B&K 2250 BZ 7222 Sound Analysis Specifications
To see the specifications for the various options available, click a link
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
Transducers are described in a transducer database with information on Serial Number, Nominal Sensitivity, Polarisation Voltage, Free field Type, CCLD required, Capacitance and additional information. The analogue hardware is setup automatically in accordance with the selected transducer
For microphones of known types, BZ 7222 is able to correct the frequency response to compensate for free or diffuse sound fields
Parallel Detectors on every measurement:
A or B-weighted (switchable) broadband detector channel with three exponential time weightings (Fast, Slow, Impulse), one linear averaging detector and one peak detector
C or Z-weighted (switchable) as above for A and B weighted
Overload Detector: Monitors the overload outputs of all the frequency weighted channels
X = frequency weightings A or B
Y = frequency weightings C or Z
V = frequency weightings A, B, C or Z U = time weightings F or S N= number between 0.1 and 99.9
For Storage
Full statistics
Dynamic Range: From typical noise floor to max. level for a 1 kHz pure tone signal, A-weighted: 16.6 to 140 dB
Primary Indicator Range: in accordance with IEC 60651, A-weighted 23.5 dB to 123 dB
Linearity Range: In accordance with IEC 60804, A-weighted, 1kHz: 21.4 dB to 140 dB
Linear Operating Range: In accordance with IEC 61672, A-weighted 1 kHz: 24.8 dB to 140 dB
Peak C Range: In accordance with IEC 61672, 29.5 dB to 143 dB
The Statistics can be based on either LXF, LXS or LXeq:
Statistics LXFN1-7 or LXSN1-7 are based on sampling LXF or LXS every 10 ms into 0.2 dB wide classes over 130 dB
Statistics LXN1-7 are based on sampling LXeq every second into 0.2 dB wide classes over 130 dB
Full distribution saved with measurement
SLM: Measurement data displayed as numbers of various sizes and one quasi-analogue bar
Measurement data are displayed as dB values, housekeeping data as numbers in relevant format
Instantaneous measurement LXF is displayed as a quasi-analogue bar
Manual: Manually controlled single measurement
Automatic: pre-set measurement time from 1 s to 24 hours in 1 s steps
Manual Controls: Reset, Start, Pause, Back-erase, Continue and Store the measurement manually
The last 5 s of data can be erased without resetting the measurement
On Screen: Information such as overload and running/paused are displayed on screen as icons
Traffic Lights: Red, yellow and green LEDs show measurement status and instantaneous overload as follows:
Initial calibration is stored for comparison with later calibrations
Acoustic: Using Sound Level Calibrator Type 4231 or custom calibrator. The calibration process automatically detects the calibration level when Sound Level Calibrator Type 4231 is used
Electrical: Uses internally generated electrical signal combined with a typed-in value of microphone sensitivity
Calibration History: up to 100 of the last calibrations made are listed, the last 20 calibrations can be viewed on the instrument
The input signal can be monitored using an earphone/headphones connected to the headphone socket, or it can be fed to the output socket
Output Signal: Input conditioned; A, B, C or Z-weighted.
Gain Adjustment: -60 dB to 60 dB
LXF output (every ms) as a DC voltage between 0 V and 4 V
DC output for calibration purposes: 0 dB ~ 0 V and 200 dB ~ 4 V.
Headphone Signal: Input signal can be monitored using this socket with headphones/earphones. Gain Adjustment: -60 dB to 60 dB
Voice annotations can be attached to measurements so that verbal comments can be stored together with the measurement
Playback: Playback of voice annotations can be listened to using an earphone/headphones connected to the headphone socket. Gain Adjustment: -60 dB to 60 dB
Text annotations can be attached to measurements so that written comments can be stored with the measurement
Project Template: Defines the display and measurement setups
Project: Measurement data stored with the Project Template
Job: Projects are organised in Jobs Explorer facilities for easy management of data (copy, cut, paste, delete, rename, view data, open project, create job, set default project name)
Multi-user concept with login. Users can have their own settings with jobs and projects totally independent of other users
Date, Time and Number formats can be specified per user
E&OE - specifications subject to change without notice.
* Our standard hire charges are based on a 4-day minimum period, details other options.
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 : Specifications
B&K 2250 : Detailed Image
| Bruel & Kjaer 2250 : Sound Level Meter Option - BZ 7222 | included |
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Conforms with the National and International Standards:
Transducers
Transducers are described in a transducer database with information on Serial Number, Nominal Sensitivity, Polarisation Voltage, Free field Type, CCLD required, Capacitance and additional information. The analogue hardware is setup automatically in accordance with the selected transducer
Microphones
For microphones of known types, BZ 7222 is able to correct the frequency response to compensate for free or diffuse sound fields
Detectors
Parallel Detectors on every measurement:
A or B-weighted (switchable) broadband detector channel with three exponential time weightings (Fast, Slow, Impulse), one linear averaging detector and one peak detector
C or Z-weighted (switchable) as above for A and B weighted
Overload Detector: Monitors the overload outputs of all the frequency weighted channels
Measurements
X = frequency weightings A or B
Y = frequency weightings C or Z
V = frequency weightings A, B, C or Z U = time weightings F or S N= number between 0.1 and 99.9
Full statistics
For Display and Storage
| Start Time | Stop Time | Overload % |
| Elapsed Time | LXeq | LYeq |
| LAE | LCeq - LAeq | LVpeak |
| LASmax | LAFmax | LXImax |
| LYSmax | LYFmax | LYImax |
| LXSmin | LXFmin | LXImin |
| LYSmin | LYFmin | LYImin |
| LXIeq | LYIeq | LAIeq - LAeq |
| LAFTeq | LAFTeq - LAeq | Time Remaining |
Only for Display as Numbers or Quasi-analogue Bars
| LXS | LXF | LXI |
| LYS | LYF | LVI |
| LXS(SPL) | LXF(SPL) | LXI(SPL) |
| LYS(SPL) | LYF(SPL) | LYI(SPL) |
| LXN1 or LXUN1 | LXN2 or LXUN2 | LXN3 or LXUN3 |
| LXN4 or LXUN4 | LXN5 or LXUN5 | LXN6 or LXUN6 |
| LXN7 or LXUN7 |
Measuring Ranges
Dynamic Range: From typical noise floor to max. level for a 1 kHz pure tone signal, A-weighted: 16.6 to 140 dB
Primary Indicator Range: in accordance with IEC 60651, A-weighted 23.5 dB to 123 dB
Linearity Range: In accordance with IEC 60804, A-weighted, 1kHz: 21.4 dB to 140 dB
Linear Operating Range: In accordance with IEC 61672, A-weighted 1 kHz: 24.8 dB to 140 dB
Peak C Range: In accordance with IEC 61672, 29.5 dB to 143 dB
Sampling For Statistics
The Statistics can be based on either LXF, LXS or LXeq:
Statistics LXFN1-7 or LXSN1-7 are based on sampling LXF or LXS every 10 ms into 0.2 dB wide classes over 130 dB
Statistics LXN1-7 are based on sampling LXeq every second into 0.2 dB wide classes over 130 dB
Full distribution saved with measurement
Measurement Displays
SLM: Measurement data displayed as numbers of various sizes and one quasi-analogue bar
Measurement data are displayed as dB values, housekeeping data as numbers in relevant format
Instantaneous measurement LXF is displayed as a quasi-analogue bar
Measurement Control
Manual: Manually controlled single measurement
Automatic: pre-set measurement time from 1 s to 24 hours in 1 s steps
Manual Controls: Reset, Start, Pause, Back-erase, Continue and Store the measurement manually
Back-erase
The last 5 s of data can be erased without resetting the measurement
Measurement Status
On Screen: Information such as overload and running/paused are displayed on screen as icons
Traffic Lights: Red, yellow and green LEDs show measurement status and instantaneous overload as follows:
Yellow LED flash every 5 s = stopped, ready to measure
Green LED flashing slowly = awaiting calibration signal
Green LED on constantly = measuring
Yellow LED flashing slowly = paused, measurement not stored
Red LED flashing quickly = intermittent overload, calibration failed
Calibration
Initial calibration is stored for comparison with later calibrations
Acoustic: Using Sound Level Calibrator Type 4231 or custom calibrator. The calibration process automatically detects the calibration level when Sound Level Calibrator Type 4231 is used
Electrical: Uses internally generated electrical signal combined with a typed-in value of microphone sensitivity
Calibration History: up to 100 of the last calibrations made are listed, the last 20 calibrations can be viewed on the instrument
Signal Monitoring
The input signal can be monitored using an earphone/headphones connected to the headphone socket, or it can be fed to the output socket
Output Signal: Input conditioned; A, B, C or Z-weighted.
Gain Adjustment: -60 dB to 60 dB
LXF output (every ms) as a DC voltage between 0 V and 4 V
DC output for calibration purposes: 0 dB ~ 0 V and 200 dB ~ 4 V.
Headphone Signal: Input signal can be monitored using this socket with headphones/earphones. Gain Adjustment: -60 dB to 60 dB
Voice Annotations
Voice annotations can be attached to measurements so that verbal comments can be stored together with the measurement
Playback: Playback of voice annotations can be listened to using an earphone/headphones connected to the headphone socket. Gain Adjustment: -60 dB to 60 dB
Text Annotations
Text annotations can be attached to measurements so that written comments can be stored with the measurement
Data Management
Project Template: Defines the display and measurement setups
Project: Measurement data stored with the Project Template
Job: Projects are organised in Jobs Explorer facilities for easy management of data (copy, cut, paste, delete, rename, view data, open project, create job, set default project name)
Users
Multi-user concept with login. Users can have their own settings with jobs and projects totally independent of other users
Preferences
Date, Time and Number formats can be specified per user
* Our standard hire charges are based on a 4-day minimum period, details other options.
