Norsonic Nor848 Instruction Manual

Acoustic camera

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INSTRUCTION

MANUAL

nor848

ACOUSTIC CAMERA

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Page 1 INSTRUCTION MANUAL nor848 ACOUSTIC CAMERA...
Page 2 Norsonic AS reserves the right to amend any of the information given in this manual in order to take account of new develop- ments.
Page 3 ACOUSTIC CAMERA...
Page 4 There are no initial settings to be made wrong. The acoustic camera Nor848 has been designed with the operator in mind and is easy to use. Optionally, additional information such as rotational speed...
Page 5 Norsonic Nor848 Instruction Manual Quick start guide This quick start guide is intended as a reminder for those who have previous experience with the acoustic camera. If not, please read the full description. • Connect the microphone dish to the computer using the LAN-cable –...
Page 6: Software Installation
Instruction Manual Software installation Activating the software The Nor848 software can be found on the memory stick provided with the Nor848. If you have created the shortcut on the dock, click the Before you install the Norsonic Acoustic Camera software, Norsonic Acoustic Camera to run the software.
Page 7 Instruction Manual Assembling and setup Tilt adjustment The assembling and setup of the acoustic camera Nor848 is simple and takes just a few minutes: • Unfold the legs of the tripod fully. Place the tripod on a flat, horizontal plane and mount the microphone dish on top of it.
Page 8: Operating System
This will be the wired network settings. - Select Manually in the drop down next to “Configure IPv4”. - Type 10.0.0.32 in the “IP Address” field - Type 255.255.0.0 in the “Subnet Mask” field - Click Apply, and launch the Nor848 software to discover arrays.
Page 9: Operation
Alternatively, a previous recording may be selected and played. This is done by closing the live array connection. Start the program by double-clicking the “Norsonic Acoustic camera” icon normally placed on the desktop of The list of the stored files in the default directory (normally the computer.
Page 10 Norsonic Nor848 Instruction Manual When the recorded file is played, a sequence of pictures from the video is shown along the time scale...
Page 11 Norsonic Nor848 Instruction Manual Adjusting windows The screen consists of a combination of different windows. Note that the size of each window may be adjusted by dragging the boundary between the windows. Beam or single microphone When connected to a Live array, the signal to be frequen- cy analysed and listened to is obtained by the beamform- ing and selected by the cursor.
Page 12: Display Settings
Norsonic Nor848 Instruction Manual Display Settings Zoom and increase beamforming resolution Adjusting the focal distance In the same way as you need to focus on an object when The zooming and panning will also affect the acoustic taking an ordinary picture, you need to specify a distance analysis.
Page 13 Norsonic Nor848 Instruction Manual For frequency band colouration in live mode the sound level is calculated from 15 x 11 Selecting video or still picture directions as illustrated below. For high reso- lution frequency colouration the number is 41 Selecting colour or x 31.
Page 14: Time Resolution
Norsonic Nor848 Instruction Manual Virtual microphone Indication of sound pressure level, filtered and frequency-weighted It is possible to listen in real time to the sound approaching The sensitivities of the microphones are calibrated to dis- the acoustic camera from various directions. This is done by play the sound pressure level referred to 20 µPa at the...
Page 15: Frequency Analysis
Norsonic Nor848 Instruction Manual Frequency analysis Level and frequency for the maximum The spectrum of the sound from the virtual microphone value. Maximum value indicated by a circle. is shown as a level versus frequency diagram. You can Frequency limits for the colour-plot.
Page 16 Norsonic Nor848 Instruction Manual Colour vs level information Level sector Level histogram Time constant af- Frequency band or sin- Frequency range fects the averaging gle frequency time for the plot Manual range setting Level chart, selecting the range for Frequency range selection...
Page 17 Norsonic Nor848 Instruction Manual Acoustic eraser Sometimes sources may be closely spaced apart, or a As seen on the pictures on the opposite page the acoustic strong noise source in the area of interest is interfering with eraser completely removes the source where the sup- the recording and impairing the image quality.
Page 18 Norsonic Nor848 Instruction Manual...
Page 19 Norsonic Nor848 Instruction Manual Spectrogram By pressing the spectrogram button beneath the frequency axis a new window will pop up displaying the spectrogram from the point where the virtual microphone is positioned. The dynamic strength of the coloring of the spectrogram is altered by setting the volume higher or lower in the volume slider in the software.
Page 20: Making A Recording
Norsonic Nor848 Instruction Manual Making a recording If you want to halt the replay, click the pause button. A second click releases the halt operation. Alternatively, Clicking the record button will start a recording that will con- the space bar on the keyboard is a shortcut for the pause tinue until the button is clicked again, or until the computer button.
Page 21 Norsonic Nor848 Instruction Manual Clear time selection Zoom to time selection Pause Local time Step forward Scroll the timeline Step backward Omnidirectional to always keep Zoom timeline Go to start of sound pressure the cursor within recording Time information level indication...
Page 22 Norsonic Nor848 Instruction Manual Zoom to time selection Clear time selection Marker for Marker for start Marker for end of instant time of time selection time selection The signal from every microphone is stored in full CD-quality. This will generate about 1.8 GB per minute for the 1 m array.
Page 23 Norsonic Nor848 Instruction Manual Making Scenes Duration information based on the actual selection New Scene When you play a recorded file, you may select a part of it as Alternative formats for the export a new scene. Mark the part you want to keep as a scene in the time-line and press the “New Scene”...
Page 24: Reporting Results
Norsonic Nor848 Instruction Manual Shortcuts Reporting results Two export tools are available: one for the frequency analysis and one general. The frequency analysis export the frequency analysis in tabulated forms: frequency and level. The general export toolbar allows you to select be-...
Page 25: Rpm Measurements
Norsonic Nor848 Instruction Manual RPM measurements Please note that the RPM input connector is TTL compatible. The input circuitry is there- fore not protected against over and under voltage often found in cars and from RPM sig- nals. Precaution must be taken if signal levels are outside 0 –...
Page 26 Norsonic Nor848 Instruction Manual RPM indicator Use the zoom slider for better overview Opening a recording and choosing a selection the part of the video of the bottom of the screen which is desirable. The selection should be from the part where the...
Page 27: Changing Settings
Norsonic Nor848 Instruction Manual Changing settings Order tracking analysis The input signal is related to either the RPM of the machine To perform order tracking analysis, press the button for under investigation, or the speed in km/h. These are dis- analyzing the relationship between RPM and frequency content.
Page 28 Norsonic Nor848 Instruction Manual There are two adjustments for the spectrogram, either the maximum order in the spectrogram, or the dynamic range, can be adjusted Adjust maximum displayed order Adjust range...
Page 29 Norsonic Nor848 Instruction Manual By pressing the spectrogram label on the lower left it is possible to see the values for the straight line going through the spectro- gram. Values correspond to straight line on spectrogram Switch to spectrogram values...
Page 30: Technical Information
Norsonic Nor848 Instruction Manual Technical information Principle of operation adaptive algorithms can under certain conditions be much better than that of DAS. However, these beamformers are The output of the acoustic camera is generated by com- developed under certain constraints and can break down...
Page 31: Specifications
Norsonic Nor848 Instruction Manual Narrow band and Specifications broadband measurement Number of microphones: The broadband measurements are done by applying the time-domain DAS beamformer. The quality of the meas- Nor848A-4: 128 urement will depend on the response shown in the po- Nor848A-10: 256 lar plot, and the acoustical environment.
Page 32 P.O. Box 24 Norsonic AS supplies a complete range of instrumentation for acoustics – from sound calibrators, microphones N-3421 Lierskogen Norway and preamplifiers; via small handheld sound level meters to advanced, yet portable, real time analysers, but Tel: +47 3285 8900...