Audioscope 3000 Manuel utilisateur

AUDIOSCOPE Model 3000 - User Guide.

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 & Mechanical… Page. 9

7 - Keys description and use ..............….. Page. 10

8 - RS232 Communication port............... Page. 31

9 - Example of use Spectrum Analyser..... Page. 32

10 - Example of use RT60 analyser........... Page. 34

11 – I/O Connectors………………………........... Page. 37

12 – RS232 Connections……………………………. Page. 38

AUDIOSCOPE Model 3000

SOFTWARE RELEASE 1.4

MANUAL VERSION 1.2.

Date of version: 29 May 1994.

Revision: 27 July 2003

AUDIOSCOPE 2k Srl.

27/29, Via Caianello

00177 - R O M A - ITALY -

Tel: - +39 - 06 – 24 40 70 14

Fax: - +39 - 06 – 24 27 257

Mobile: +39 348 336 1881

Email: [email protected]

[email protected]

Website: www.audioscope.it

AUDIOSCOPE Model 3000 - User Guide.

GETTING STARTED.

Be sure that the voltage selection switch placed on the rear of the unit is placed on the voltage

position corresponding to your country.

Insert the power cable in the rear socket.

Power on the unit.

After about ten seconds, due to the display heating time, the instrument presents the image of

the last environment left stored, with the same settings left stored.

Please, remember that the settings and parameters can be stored on the main choice menu that can

be activated pressing the <MODE RT60/ANALYZER> key.

NOTE 1:

Avoid to Power-On the instrument immediately after a Power-Off. Wait ten seconds before to

Power-On again. A Power-On immediately after a Power-Off can make appear on the screen an image

not clear.

NOTE 2:

The unit is provided with a filter on the power supply input line, to avoid disturbs to be

sent/received thru the power line.

Be sure to connect the power cable to an outlet provided with an efficient ground connection. This

in order to ensure the maximum protection against electrical line disturbs, and for operation safety.

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.

NOTE 4:

The IASCA score computing function and the microphone sensitivity switch function for 130dB

and 160dB SPL full scale are available only in the version for the Car Stereo use.

For the professional use, these two functions are disabled.

AUDIOSCOPE Model 3000 - User Guide.

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.

The functions management is achieved with a keyboard held on the front panel of the unit.

The keyboard function is to select the environment, to select parameters and functions.

Connecting a printer is possible to print out the screen contents and measurement results, shown

in a tabular format.

An RS232 interface is provided to connect the instrument to an external personal computer. From

the P.C. is possible to program the instrument sending settings to execute a measuring process and

receiving the results. Results can be stored on the P.C.'s Hard Disk for further statistics.

In addition, the same RS232 port can be used to automatically control an external equalization

system, foreseen for the next future.

The instrument can perform the functions of:

1) Third of Octave Spectrum Analyser.

2) Reverberation Time Analyser (RT60).

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.

TECHNICAL SPECIFICATIONS:

1/3 of octave bands: 30: ISO frequencies between 25Hz. and 20KHz.

Level Indicator: Wideband, for SPL measurements.

Filters: 30 four pole enhanced Chebyshev filters; widely conforming to IEC255, DIN 45651 and

ANSI S1-11 1966 Class II.

INPUTS:

Microphone, Left Line (L), Right Line (R), Left Line + Right Line (L+R), Left Line - Right Line (L-

R), Generator.

MICROPHONE: Selects the Microphone Input.

LEFT LINE (L): Selects the Left Line Input.

RIGHT LINE (R): Selects the Right Line Input.

LEFT + RIGHT LINE (L+R): Selects the sum between the Left and Right Line Inputs.

LEFT - RIGHT LINE (L-R): Selects the difference between the Left and Right Line Inputs.

GENERATOR: The generator output is used as input to monitor the generator output signal.

INPUTS SPECIFICATIONS:

MICROPHONE INPUT: Input impedance: 6k Ohm, electronically balanced.

Input sensitivity: 8 mV/PA. (***).

Acoustic pressure range measured:

130 to 45 dB SPL.

160 to 75 dB SPL.

The two ranges are selectable via the <Mode RT60/Analyzer> Menu key, and are valid for the

microphone input only.

Input Connector: 3-pole XLR type.

Phantom power supply: +15V. For condenser microphones.

It can be switched off via the switch placed on the rear panel.

LINE INPUTS:

Input impedance: 20K Ohm, electronically balanced.

Input connector: 3 pole XLR type.

Max. Input Voltage: +20dBu.

L-R Line Input: CMRR: Better than -70dBu (20Hz - 20KHz.).

WEIGHTING FILTERS:

FLAT, 'A', Direct.

FLAT FILTER: four poles, analogue band pass filter.

Frequency response: 20Hz. - 22KHz. +/-.2dB. Roll-Off: 12dB/Octave.

"A" WEIGHT: Filter for acoustic measurements. Conforming to IEC 169/10.

DIRECT FILTER: No filter inserted, is an all pass.

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.

-RS232: Serial communication port to/from a personal computer. Connector type Sub-D 9 poles.

-VIDEO OUTPUT: For standard VGA colour monitors, 640x480 pixel resolution. Connector type Sub-D

15 pole high density.

SIGNAL GENERATOR:

-PINK-NOISE:

Frequency response: From 20Hz. to 20KHz. +/- .2dB.

Output Level: -10dBu max.

Output attenuator: from -10 to -45dBu in 5dBu steps.

Output impedance: 22 Ohm +/-5%, electronically balanced.

(*) EPSON is a registered Trademark of the EPSON Corporation.

(**) IBM is a registered Trademark of the IBM Corporation.

(***) It is the voltage (mV.) that applied to the microphone input make read about 94dB SPL on the

Wideband indicator.

READING SCALES:

-25dB, Logarithmic. Resolution better than 0,1dB.

-50dB, Logarithmic. Resolution better than 0,2dB.

SCALE MEASURING UNITS:

- dBu. dB referred to .7745V. (0dBu = .7745V.).

- SPL. Sound Pressure Level. A signal of 8mV Eff. Applied to the microphone input make read about

94dB SPL on the Wideband indicator.

INTEGRATION TIME CONSTANTS:

ATTACK-DECAY TIMES: 1/8, 1/4, 1/2, 1, 2, 4, 6, 8s.

MEMORIES.

7 memories to store spectra levels.

7 memories to store RT60 levels.

STATUS:

It is the instrument status, depending on the functions executed.

Instrument status can be: Hold/Write, Max-Hold, Read, Compare, Real-Time, Running, Printing,

Waiting, Send232, Recv232.

ENVIRONMENT INFORMATIONS:

The last two rows placed in the bottom of the screen are dedicated to show the parameter values.

Parameters that can appear are the followings:

1)- INPUT: Input selected.

2)- SCALE RANGE: Scale Range selected.

3)- FREQ: Frequency corresponding to the band selected by the cursor.

4)- LEVEL: SPL level of the band selected by the cursor.

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.

10)- STATUS: Instrument status.

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.

Please, refer to the Spectrum Analyser specs, for more detailed information’s.

The reverberation time Analyser (RT60) works sending in the room a Pink Noise burst signal and then

measuring, via the measuring microphone, the level Vs. time of the reverberated signal related to the

selected frequency.

The Pink-Noise burst is sent in the room via an external amplification system for the burst duration

specified in the parameter 'Burst Time', and the decay levels measured during the time declared in

the parameter 'Scale Time'. The decay levels are measured after that the time corresponding to the

parameter 'distance' is passed.

The 'Distance' parameter is the distance (in Meters) between the sound source and the microphone.

This number is translated by the instrument in the equivalent time the sound needs to run from the

speaker(s) and the measuring microphone, and the instrument will wait this time before to begin to

measure the decay levels.

This to avoid measuring the 'Direct' sound, because our interest is to measure the 'Reflected' sound

levels.

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.

2) - SCALE RANGE: Range scale selected (Always 50dB).

3) - FREQ: Frequency corresponding to the band selected by the cursor. Is the measurement

frequency.

4) - DISTANCE: Distance in meters between the signal source and the measurement microphone.

5) - LEVEL: Level in dBu corresponding to the time selected by the cursor.

6) - FRMIS: Is the frequency the last measurement has been made.

7) - FRMEM: Is the frequency the recalled memory was made. When the measurement results are

stored, the measurement frequency value is stored too. This is the frequency at which the recalled

results were made.

8) - BURST T.: Pink Noise burst duration.

9) - MEMORY: Selected memory number.

10)- PINK N.: Pink Noise generator level.

11)- STATUS: Status of the instrument.

AUDIOSCOPE Model 3000 - User Guide.

SPECTRUM ANALYSER + RT60 Model 3000.

MECHANICAL AND ELECTRICAL CARACTERISTICS.

MECHANICAL AND ELECTRICAL CARACTERISTICS.:

POWER: Voltage: 117 V. from 100 to 125 V.

220 V. from 198 to 230 V.

FREQUENCY: 50/60Hz. Power consumption: About 120 W.

MECHANICS. DIMENSIONS:

Box only: m/m 440 x 126 x 320 (w,h,d).

Measured at max points: m/m 483 x 133 x 330 (w,h,d).

WEIGHT: About 10 Kg. (20Lbs.)

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.

The parameter selections are:

- Date of the Day selection.

- Analyser or RT60 selection.

- EPSON(*) or IBM PROPRINTER(**) printer selection.

- Enable IASCA computing score.

- Microphone output level selection: 130/160dBSPL.

- Recall standard instrument settings.

- Store actual instrument Parameters/Settings.

- Average/Difference between memories.

DATE OF THE DAY SETTING.

Is possible to select the date of the day in terms of Day, Month, Year (GG:MM:AA) or Month, Day,

Year (MM:DD:YY). The date will appear in the printout, right to the label "Date:".

The three date elements (Day, Month, Year) can be selected using the keys <Integr. -/+>, <Pink

N. -/+>, <Input -/+>.

The Date of the day can be stored along with the instrument parameters and settings pressing

the <REAL TIME> key.

ANALYZER/RT60 SELECTION.

To select the Spectrum analyser environment, just press the <WEIGHT> key, whilst to select

the RT60 environment, just press the <MEMORY -> key.

The selection is evidenced by a light filled rectangle appearing at the left side of the selected option.

To exit this main menu, and to return to the selected environment, press the <MODE

RT60/ANALYSER> key.

If the selected environment is the Spectrum Analyser, it is presented in 'Real Time' status, whilst

if the selected environment is the RT60 analyser, it is presented in the 'Waiting' Status.

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