This Readme file contains last-minute product information for DIRAC 6. For full instructions on using DIRAC, please see the DIRAC help file.

Table of Contents

  1. Installation 
  2. Update and upgrade information 
  3. Using DIRAC with the HASP key
  4. Changes from the previous version
  5. Known problems and issues
  6. How to use the stimuli on the CD
  7. How to contact technical support
  8. Minimum hardware requirements

1. Installation

Follow these steps to install DIRAC on your computer:

  1. Insert the DIRAC CDROM in the CD drive.
  2. If AutoRun is enabled, you will see a menu allowing you to install the software. If AutoRun is not enabled, you will have to run Setup.exe from the Setup folder on the CDROM.
  3. When the 'File Download' dialog is displayed, select 'Run this program from the current location'.
  4. If a security warning is displayed, select 'Yes' to proceed with the installation.
  5. Wait untill DIRAC has been installed, and click 'Finish' to complete the installation
  6. If you received a HASP key with DIRAC, also select 'Install HASP driver' from the menu, or run HASPUserSetup.exe from the HASP folder on the CDROM.

If the above does not work for some reason, navigate to the "Setup" folder on the CDROM and run the "Setup.exe" program.

Follow these steps to run DIRAC:

  1. Begin at the Windows desktop.
  2. Click the Start button.
  3. Select Programs.
  4. Select the DIRAC program group and click the DIRAC 6 icon.

Follow these steps to remove DIRAC from your computer:

  1. Begin at the Windows desktop.
  2. Click the Start button.
  3. Select Settings, and then click Control Panel.
  4. From Control Panel, double click "Add/Remove Programs".
  5. Click the "Install/Uninstall" tab.
  6. Highlight "DIRAC 6".
  7. Click the "Add/Remove" button. This removes DIRAC from your computer.

2. Update and upgrade information

DIRAC 6 replaces earlier versions of DIRAC and requires an update of your HASP codes.

Installing DIRAC 6 does not require you to uninstall earlier versions, provided you do not install DIRAC 6 in the same folder as an earlier version.

DIRAC 6 requires a new sound device setup and new system calibrations after an upgrade from earlier versions.

3. Using Dirac with the HASP key

Follow the Installation instructions in section 1 of this document, to install the HASP driver.

Plug the HASP key in any parallel port (or USB port if you have an USB HASP) before using the software. The HASP key is fully transparent to the operation of the computer and any connected peripherals. 

4. Changes from the previous versions

Changes from version 5.5 to version 6:

Changes from version 5 to version 5.5:

Changes from version 4.1 to version 5:

Changes from version 4.0 to version 4.1:

Changes from version 3.1 to version 4.0:

5. Known problems and issues

A system calibration is only valid for octave band values. E.g. calibrated Strength (G) and related parameter values can only be obtained in octave bands, not in third-octave bands.

If you experience problems entering numeric values (such as gain settings), verify that the Number's 'decimal symbol' differs from the Currency's 'digit grouping symbol' as set through the Regional Settings in the Control Panel on the Start menu. In general, there must be no conflict between the Number and the Currency settings.

6. How to use the stimuli on the CD

The DIRAC CD contains a folder named 'Stimuli' containing MLS and Sweep signals for use in asynchronous (or open loop) measurements. The stimuli in .MP3 format are each 10 minutes in length and can be copied to any MP3 player. The stimuli in .WAV format are each only 1 stimulus period in length and multiple periods have to be concatenated prior to creating an audio CD. To create a CD containing some of the .WAV format stimuli, please use the following steps:

  1. Open a .WAV stimulus of the desired type and period.
  2. Use the Copy and Paste functions on the Edit menu in Dirac to concatenate multiple periods until the file has the desired length.
  3. Save the result of the previous step in a .WAV format file without DIRAC specific information. (Use the 'Save as type' pulldown).
  4. Use Windows Explorer (or other software) to create an Audio CD containing the processed files.

7. How to contact technical support

If, after thoroughly reviewing this ReadMe file and the product documentation, you are still having a problem with this software, you can send in a Problem Report using an option in the Help menu, or you can contact your local Bruel & Kjaer representative.

Check the support information on the B&K website at:

8. Minimum hardware requirements

DIRAC runs on a PC with:

In order to use DIRAC, additional hardware is necessary. The most commonly used hardware components are:


We really hope that you enjoy working with DIRAC.