New in Version 4.7

Overview of the Release

Wind turbines

Release 4.7 adds data integrity check to detect accidental changes to the data and the calibration parameters.

The release adds support for the ½" Prepolarized Free‐field Microphone Type 4966 and the ½" Pressure-field Microphone Type 4192.

The release also includes enhancements for logging spectra at 100 ms rate. One of the usages is rating amplitude modulation in wind turbine noise, as recommended by IOA AMWG 2016.

A number of Sound Intensity users have requested the possibility of pausing during scanning, this has been implemented.

Finally a number of bugs have been fixed.

Fixed in version, Software Package 33, 2018-08-20

All Cannot use new version of UL-1050 Wi-Fi dongle
All Possible crash when starting G1-G3 when switched off from a recalled state
BZ-7225 Level Trigger doesn't work with Hold Off for Stop Duration = 1
BZ-7228 Cannot load project in some situations
BZ-7228 ISO 16283: Wrong rounding of data before calculation
BZ-7228 Possible crash when changing task after cancel of overwriting a position
BZ-7229 Cannot use CCLD microphone and microphone requiring polarization voltage in 2 ch. measurements
BZ-7232 Display of CIC/AC doesn’t take daylight savings into account
BZ-7232 EPNL calculation not based on ½ s values
BZ-7233 Cannot measure SI if microphone is initial calibrated on rear socket

Enhancements and bugs fixed in version, Software Package 32e, 2018-02-26

BZ-7133 Special installation for 2250-L MATRON 4 with new templates
BZ-7232 Can choose audio recording with or without AGC
All Doesn't always recognize two inserted SD-cards after resuming from standby (G4 only)
All CRC not always updated correct on transducer database after power fail (G4 only)
All Sometimes crash when switching template immediately after a calibration
BZ-7232 EPNL calculations not based on LZF spectra
BZ-7233 Cannot open project on surface with one segment when this is excluded

Fixed in version, Software Package 32d, 2017-10-16

BZ-7230 Cannot calibrate directly from power off - needs to load another template first
BZ-7232 Cannot set instrument into stand-by mode
BZ-7233 Pause/Continue and Store can hang when doing ISO 9614-2 and ECMA 160 scans with sound recording

Enhancements in version, Software Package 32c, 2017-06-02

Support WELMEC 7.2 Software Guide

The software has been made in accordance with the WELMEC 7.2 Software Guide - see Recommendation at the bottom of this page.

The version 4.7.3 software can be downloaded and installed on your instrument - then you will benefit from the improvements without having the restrictions imposed by the guide (G4 only).

Check integrity of program files

All program files are protected with a CRC checksum – as required by WELMEC 7.2 (G4 only). The CRC of the program files is checked when you switch on the instrument. The CRC checksum is displayed in About.

Check integrity of measurement data

All data files are protected with a CRC checksum – both on internal disk and on SD-cards – as required by WELMEC 7.2 (G4 only). The CRC of the data files is checked when you open the data.

Check integrity of calibration

The microphone database and calibrations are protected with a CRC checksum – as required by WELMEC 7.2 (G4 only). The CRC of the calibration parameters is checked when you start a measurement.

Type approved by PTB

Type Approved by PTB Germany

The version has been type approved by Physikalisch-Technische Bundesanstalt (PTB) in Germany for use with any hardware version of 2250, 2270 and 2250-L.

German users with G4 instruments requiring PTB type approval should either remain on their current type-approved version of the software or they should send their instrument in for a BZ-7242 service upgrade.

Other Features

All Display of Time Zone for recalled data has been added
All “Deviation from Last” on Calibration Screen has been replaced by “Deviation from Initial”
All Copying data from memory card to internal disk is not allowed to ensure integrity of data on the internal disk
BZ-7225 Make Reports aligned to "Save Project at" instead of 00:00:00. This enables e.g. 8 hour reports at 6:00, 14:00, 22:00
BZ-7224/25/26/29 The size of allowed USB memory cards is limited to 32 GByte to avoid problems when logging data on the card (G4 only)

Fixed in this release

All Spanish WELMEC only: BZ-5503 cannot delete data on SD-cards in 2250/70
All Spanish WELMEC only: Crash after switching user
All Cannot calibrate after downgrade of software from version 4.7.2 (G1-G3 only)
All Min. value for start time and stop time not allowed in metadata for cloud
BZ-7224/25/26 Occasionally crashes when resetting a logging measurement with signal recording immediately after start
BZ-7224/25/26 Too few digits in display of Rainfall
BZ-7224/25/29 Restart after crash shows pop-up when meas. 2 ch. micr. + acc. at very low freq.

Fixed in version, Software Package 32b, 2016-12-21

All Display of Calibration Sensitivity wrong for Decimal Point = “,”
BZ-7224/25 Possible crash when saving data
BZ-7233 Auto ranging does not work for ISO 9614-2 and ECMA 160
BZ-7233 Scan 2 shows inst. values instead of averages
BZ-7234 Some combinations of Broadband vibration detectors made wrong Peak and Spectrum weightings

Fixed in version, Software Package 32a, 2016-12-02

All WebServer sometimes hangs if REST commands are received during startup
BZ-7230 Sound Recording sometimes stored in previous project

New features in version, Software Package 32, 2016-11-18


New Microphones

Support for microphone Types 4966 and 4192

The new ½" Prepolarized Free‐field Microphone Type 4966 and the ½" Pressure-field Microphone Type 4192 are now supported by 2250 and 2270.

Type 4966 is for general purpose sound measurements and Type 4192 is for precission coupler measurements.

You can create the microphone in the transducer database by selecting the right microphone type, then all necessary settings are done automatically.

Note: Set the Sound Field Correction to Pressure-field in the Input Setup, when the 4192 microphone is used in a coupler.

Logging 100 ms spectra

Logging spectra every 100 ms

Logging of spectra (LXeq, LXF or LXS, X: the spectrum weighting) every 100 ms has been added to all logging templates for 2250/2270/2250-L.

The spectra will be part of the fast logging parameters stored on the project with a logging period of 100 ms, but will not be displayed by the analyzer. Use MPS BZ-5503 to display the spectra logged every 100 ms.

Lock screen

Lock screen only

In addition to lock the keys and screen from any inadvertent operation a "Lock screen only" feature has been implemented. This prevents operations through the screen interface (except answering pop-ups) and prevents screen changes using the pushbuttons; however, you can still use the measurement control pushbuttons. This state is remembered during power off and is ideal when you hand over the instrument to personnel responsible of performing the measurements and you want to be sure that no settings nor parameters on the screen will be changed.

Be sure to remember the unlock procedure.

Pausing a scan

Pausing a scan

Using the scanning method in the Sound Intensity module for 2270 for the standards ISO 9614-2 and ECMA 160 sometimes requires a pause to move the sound intensity probe around objects located on the surface.

This is possible simply by pressing the Pause/Continue pushbutton and then move the probe.

When the probe is in position again, press Pause/Continue to continue the scan.

Press the Save pushbutton to advance to scan 2, or - if in scan 2 - save the scans.

Back-erase will erase back to the previous pause or to the start of the scan, which ever is the latest.

Note: If you have set Measurement Mode to Automatic, then when preset-time has elapsed you will automatically advance from scan 1 to scan 2 or scan 2 will be completed ready for save (or saved if Automatic Save is On).

Other Features

All Added icon for outdoor microphone 90 degrees
All Enable Off setting in value panels
All New parameter for REST interface: LXF(SPL)-Buffer
BZ-7223/24/25/29 Spectrum statistics at Extended and Very Low frequencies based on spectra sampled at 100 ms intervals

Fixed in this release

All Remote API Help file not updated with enhanced vibration parameters.
All Wrong display of accelerometer sensitivity when displayed in mV/g
All Very Low frequency setting not possible for LF Microphone without UC-0211
All Display of deviation from last calibration wrong after power off/on
All Wi-Fi card message sometimes hangs after suspend/resume
All 2250/2270 PC Demo type switcher can only be used as administrator
BZ-7222/23 + BZ-7130/31/32 Measurement can run a few seconds longer than preset-time when paused and back-erased a number of times
BZ-7225 Sound Recording Timer Trigger with no sync. waits one period before first trigger
BZ-7225 Sound Recording Timer Trigger not always synchronized with clock
BZ-7226 Tacho Channel not always indicated correct in signal recording
BZ-7228 Possible crash when manual storing data at same time as automatic storing is performed
BZ-7228 Possible crash when changing Function or Task while measuring
BZ-7228 Possibility of minor rounding error for background noise correction
BZ-7232 Spectra not always Z-weighted
BZ-7233 Cannot always read setup from some old SI projects
BZ-7233 BB values not updated correct on a surface with one excluded segment, preventing projects to be exported from MPS BZ-5503
BZ-7233 ISO 9614-1 standard: Surface Sound Intensity not averaged correct
BZ-7233 No probe icon when selecting a spacer > 12 mm
BZ-7234 LG10max not updated the first 16s of measurement


Brüel & Kjær recommends that you always use the most current software available. New versions of the analyzer software, which you may want to install, are available for download.

Updating your analyzer’s software version has no influence on measurement accuracy and in no way affects the quality of the measurement. Calibration is however only valid for the analyzer software version installed at the time of calibration. The analyzer software version is stated on your calibration certificate. Therefore updating your analyzer’s software version will invalidate your calibration. This will always be the case regardless of which laboratory you have chosen to perform the calibration.

WELMEC 7.2 is a software guide made by the European metrology authorities as part of the Measuring Instruments Directive 2014/32/EU.
This guide describes many healthy software practices (like securing the software files, the legally relevant parameters and the measurement data with CRC checksums) and how to validate, that these have been followed. All these are fulfilled by the software for Types 2250, 2270 and 2250 Light (G4 only).
In addition the guide describes limitations for the user’s ability to update the software and limitations to change legally relevant parameters like the clock and the calibration of the instrument – some of these limitations are required by a few countries. This is handled by setting an electronic switch in the hardware (on delivery from the factory), then the software from version 4.7.3 will make the relevant limitations for the user.

If the type approval in your country requires fulfillment of WELMEC 7.2 (currently the case for Spain and Germany), then you may need to send your instrument for update at Brüel & Kjær.

Older Versions