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Audioscope 3000 Operating Instructions Manual

Spectrum analyzer
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Summary of Contents for Audioscope 3000

  • Page 2: Table Of Contents

    AUDIOSCOPE Model 3000 - User Guide. TABLE OF CONTENTS. TABLE OF CONTENTS. 1 - Table of Contents......…... Page. 2 2 - Getting started......……….. Page. 3 3 - General description.....……. Page. 4 4 - Spectrum analyser......…… Page. 5 5 - Reverberation Time Analyser (RT60)... Page. 8 6 - Environment, Electrical &...

  • Page 3: Getting Started

    NOTE 3: If the printer is connected to the 3000 unit, be sure to power-on first the 3000 unit, and then the printer. This to avoid making appear on the screen an image not clear.

  • Page 4: General Description

    GENERAL DESCRIPTION. GENERAL DESCRIPTION. The AUDIOSCOPE Model 3000 is an audio measuring instrument, designed for measurement and control in Audio Professional environments, P.A., Radio, Television, Industry. A 3U rackmount unit composes the instrument with a 5"1/2 high resolution, green phosphorus monitor housed into the cabinet.

  • Page 5: Spectrum Analyser

    AUDIOSCOPE Model 3000 - User Guide. THIRD OF OCTAVE SPECTRUM ANALYSER. TECHNICAL SPECIFICATIONS. THIRD OF OCTAVE SPECTRUM ANALYSER. The third of octave spectrum analyser have been designed for accurate measurements in Professional Audio environments, P.A., Radio, Television and Industry. It can be used, for example, to test many parameters of an audio mixing console, of a multitrack tape recorder, or to test speakers or microphones during the manufacturing process.
  • Page 6 AUDIOSCOPE Model 3000 - User Guide. THIRD OF OCTAVE SPECTRUM ANALYSER. TECHNICAL SPECIFICATIONS. AUDIO OUTPUTS: - GENERATOR: Pink noise generator output. Output Connector: 3-pole XLR type. DIGITAL INPUT/OUTPUTS: - PRINTER: Parallel type, printer output. For EPSON(*) or IBM Proprinter(**) printers. Connector type Sub-D 25 poles.
  • Page 7 AUDIOSCOPE Model 3000 - User Guide. THIRD OF OCTAVE SPECTRUM ANALYSER. TECHNICAL SPECIFICATIONS. 5)- LEVEL: dBu level of the band selected by the cursor. 6)- WEIGHT: Weight filter selected. 7)- INTEGR: Integration time selected. 8)- MEMORY: Memory number selected. 9)- PINK N.: Pink Noise generator output level.

  • Page 8: Reverberation Time Analyser (Rt60)

    AUDIOSCOPE Model 3000 - User Guide. Reverberation time Analyser (RT60). Technical specifications. REVERBERATION TIME ANALYSER (RT60). The reverberation time analyser (RT60), have been realized to make acoustic measurements of acoustic rooms, concert halls, recording studios, cinema, theatre, etc. All technical data relating to Inputs, Outputs and the generator are those described in the Spectrum Analyser environment.

  • Page 9: Environment, Electrical & Mechanical

    AUDIOSCOPE Model 3000 - User Guide. Reverberation time Analyser (RT60). Technical specifications. ENVIRONMENT INFORMATIONS: The last two rows in the bottom of the screen are dedicated to show the parameters set. The parameters that appear are the followings: 1) - INPUT: Selected input.

  • Page 10: Keys Description And Use

    AUDIOSCOPE Model 3000 - User Guide. ENVIRONMENT SELECTION: <MODE RT60/ANALYSER> KEY. MAIN OPTIONS MENU. ENVIRONMENT SELECTION AND MAIN OPTIONS: <MODE RT60/ANALYSER> KEY. Pressing this key will cause to make appear in the lower part of the screen some other selection parameter rows.
  • Page 11 AUDIOSCOPE Model 3000 - User Guide. ENVIRONMENT SELECTION: <MODE RT60/ANALYSER> KEY. MAIN OPTIONS MENU. All parameters and settings of the recalled environment will be set and, in case of the RT60 environment, the last measuring results will be presented on the screen.
  • Page 12 AUDIOSCOPE Model 3000 - User Guide. ENVIRONMENT SELECTION: <MODE RT60/ANALYSER> KEY. MAIN OPTIONS MENU. MICROPHONE OUTPUT LEVEL SELECTION: 130/160dBSPL. Is possible to select two different microphone types with different output voltages and then different capacity to measure acoustic pressure levels.
  • Page 13 AUDIOSCOPE Model 3000 - User Guide. ENVIRONMENT SELECTION: <MODE RT60/ANALYSER> KEY. MAIN OPTIONS MENU. The numbers inside the parentheses (E.G.< 1>) indicate the memory numbers. The space at the left side of the number is reserved to the memory selection cursor and/or to the enabled memory indicator.
  • Page 14 AUDIOSCOPE Model 3000 - User Guide. SCALE TIME: <SCALE-TIME> KEY. SCALE-TIME. Selects the Scale-Time for reverberation time (RT60) measurements. The scale time is composed of 32 values computed in the interval between zero and the full-scale value. The scale time appears instead the frequency labels.
  • Page 15 AUDIOSCOPE Model 3000 - User Guide. SOURCE-MICROPHONE DISTANCE: <SOURCE DISTANCE> KEY. DISTANCE (BETWEEN SOURCE AND MICROPHONE). It is the distance, expressed in meters, between the sound source (Speaker(s)) and the measurement microphone. This parameter is translated by the instrument in terms of time occurring to a sound to run along the declared distance, and will be used as waiting time before to acquire the reverberation curve level data.
  • Page 16 AUDIOSCOPE Modello 3000 - Guida all'uso. MEASUREMENT START: <RT60 START> KEY. RT60 MEASUREMENT START. The reverberation time measurement is achieved by sending in the room a pink noise burst signal and then measuring -via the measuring microphone-, the level vs. time of the reverberated signal at the frequency selected via the horizontal cursors.
  • Page 17 AUDIOSCOPE Model 3000 - User Guide. RESULTS PRINTOUT: <PRINT SCREEN> KEY. The frequency the measurement has been done will appear in the system informations as 'FRMIS'. RESULTS PRINTOUT. To print the image on the screen and the measurement data with a parallel dot printer. The printer type can be selected in the 'Mode RT60/Analyser' menu.
  • Page 18 AUDIOSCOPE Model 3000 - User Guide. SCALE RANGE: <SCALE SELECT.> KEY. SCALE SELECT. With the <SCALE SELECT> key, is possible to select two reading scales, to see the signals with different scale dynamics and resolution. If the instrument is in Hold/Write, Max.Hold, Read or Compare status, these keys have no effect.
  • Page 19 AUDIOSCOPE Model 3000 - User Guide. SCALE POSITION -/+: <SCALE POSITION- SCALE POSITION +/ KEYS. SCALE POSITION -/+: (SCALE POS.- SCALE POS.+). The purpose of these keys is to change the top of scale in 5dB steps. The scale values will automatically be changed according to the new position.
  • Page 20 AUDIOSCOPE Model 3000 - User Guide. WEIGHT FILTERS: <WEIGHT FILTERS> KEY. WEIGHT FILTERS. Three weight filters are available: Flat, A, Direct. The 'Flat' filter is to be used for frequency response measurements with the spectrum analyzer. The band is limited to 20Hz. and 22KHz. so that values outside these limits do not affect the SPL measurements.
  • Page 21 AUDIOSCOPE Model 3000 - User Guide. MEMORY SELECTION: <MEMORY SEL.- MEMORY SEL.+> KEYS. MEMORY SELECTION: (MEMORY SEL.- MEMORY SEL.+). There are seven memories in the Spectrum Analyzer environment, and seven memories in the RT60 environment. It is possible then to store up to seven spectra and up to seven RT60 measuring results.
  • Page 22 AUDIOSCOPE Model 3000 - User Guide. HOLD AND STORE: <HOLD WRITE> KEY. HOLD AND STORE: (HOLD/WRITE). The <HOLD WRITE> key holds the real-time and stores the current spectrum data into the selected memory number. If the RT60 environment is active, the last measurement curve will be stored.
  • Page 23 AUDIOSCOPE Model 3000 - User Guide. MAX-HOLD: <MAX-HOLD> KEY. MAX-HOLD: (MAXIMUM LEVEL REACHED). The <MAX-HOLD> key first resets the real-time spectrum to the minimum level position and then presents the maximum band levels. The image on the screen is updated when the level of everyone band is greater than the actual.
  • Page 24 AUDIOSCOPE Model 3000 - User Guide. MEMORY READ: <READ> KEY. MEMORY READ Pressing the <READ> key, the memory contents associated with the selected memory number are presented on the screen. In the 'Read' status is possible to see the other memories by pressing the <Memory-> or <Memory+>...
  • Page 25 AUDIOSCOPE Model 3000 - User Guide. COMPARISON BETWEEN A MEMORY AND THE REAL-TIME: <COMPARE> KEY. COMPARISON BETWEEN A MEMORY AND THE REAL-TIME (COMPARE). Pressing the <COMPARE> key, the histogram bars are divided in two vertical halves. The left half (more wide) shows the real-time level (or the RT60 level), whilst the right half (more narrow), show the selected memory level.
  • Page 26 AUDIOSCOPE Model 3000 - User Guide. RETURN TO THE REAL-TIME STATUS: <REAL TIME> KEY. RETURN TO THE REAL-TIME STATUS (REAL-TIME). Pressing the <REAL TIME> key allows the return from a memory function to the 'Real-Time' status or to the 'Waiting' Status if the active environment is the RT60.
  • Page 27 AUDIOSCOPE Model 3000 - User Guide. CURSOR POSITION: <ARROWS> KEYS. CURSOR POSITION (ARROWS). The left and right arrows (< <- -> > keys) are dedicated to move the cursor along the bar positions. The cursor is placed under the bars and looks like a vertical arrow. The arrow points a bar.
  • Page 28 AUDIOSCOPE Model 3000 - User Guide. INTEGRATION TIME AND BURST DURATION SELECTION: <INTEGR/BURST+/-> KEYS. INTEGRATION TIME AND BURST DURATION (INTEGR/BURST+/-). These keys have a different function, depending on the active environment. SPECTRUM ANALYSER: In the Spectrum analyzer environment, these keys ere dedicated to select a different integration- time value of the Third-of-Octave band levels.
  • Page 29 AUDIOSCOPE Model 3000 - User Guide. GENERATOR OUTPUT LEVEL: <PINK N. OUTP-/+> KEYS. GENERATOR OUTPUT LEVEL (PINK N. OUTPUT-/+). These keys are dedicated to adjust the Pink-Noise generator output. The output level is in 5dB steps. The Pink-Noise generator output level is about 10Vpp. at -10dBu (Maximum level). It is recommended to use low output levels (-30 ~ -35dBu) to avoid the saturation of the amplifier or pre- amplifier input where the Pink-Noise signal is connected.
  • Page 30 AUDIOSCOPE Model 3000 - User Guide. INPUTS SELECTOR: <INPUTS SEL.-/+> KEYS. INPUTS SELECTOR (INPUTS SEL.-/+) To select the input from which the measurement is made. Inputs that can be selected are: 1 - OFF - No input selected. 2 - Micro - The Microphone input is selected.

  • Page 31: Rs232 Communication Port

    Hard Disk. In other words, the P.C. works as a substitute of the 3000's keyboard with a screen page showing the parameters, commands and settings status. The enormous advantage is to perform measurements automatically and to store measuring results on the PC's Hard Disk.

  • Page 32: Example Of Use Spectrum Analyser

    A third of octave or parametric equalizer is necessary to modify the response curve of the room. - Set to the minimum level the volume of the amplifier. - Connect the Pink Noise Generator output of the Audioscope 3000 to a 'High Level' input of the amplifier or pre-amplifier.
  • Page 33 AUDIOSCOPE Model 3000 - User Guide. SPECTRUM ANALYSER - EXAMPLE OF USE -. If you want to hold the screen to better evaluate the response curve, just press the <HOLD WRITE> key. (Remember that this causes the selected memory number contents to be updated.) Once established the frequency bands to correct, you can modify the equalizer controls and 'build' the desired response curve.

  • Page 34: Example Of Use Rt60 Analyser

    There are some instruments that read a reverberation value in seconds at some frequencies. The Audioscope Model 3000 not only measures this reverberation time but also shows the decay levels of a sound in the selected scale time and for each one of the 30 frequencies.
  • Page 35 AUDIOSCOPE Model 3000 - User Guide. EXAMPLE OF USE OF THE RT60. - Connect the 'Pink-noise' output of the 3000 to a High-Level input of the amplifier. (Line, Tuner, Aux. input). - Set the generator output level of the Audioscope 3000 to a level compatible with the amplifier or preamplifier input.
  • Page 36 If you want to make the same measurement at different microphone positions, is possible to store the curve, to activate the 'Compare' status, and to make the new measurement: the 3000 will show the two curves (the curve stored and the curve last made), this permitting to evaluate the differences.

  • Page 37: I/O Connectors

    AUDIOSCOPE Model 3000 - User Guide. I/O Connectors.

  • Page 38: Rs232 Connections

    AUDIOSCOPE Model 3000 - User Guide. RS232 Connections.

This manual is also suitable for:

Rt60

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