Norsonic Nor265 Manuel utilisateur

Im265_1Ed1R2En

December 2004

Nor265 User Guide – December 2004 edition

Im265_1Ed1R2En

orsonic is a registered trademark of Norsonic AS.

Every effort has been made to supply complete and accurate information. However, Norsonic AS assumes no

responsibility for the use of – nor for the consequential damage of the use of – this information and/or the

instrumentation described herein. Furthermore Norsonic AS assumes no responsibility for any infringement of the

intellectual property rights of third parties, wherever applicable, which could result from such use.

orsonic AS reserves the right to amend any of the information given in this manual in order to take account of new

developments.

If you wish to communicate with us, please feel welcome.

Our address is:

orsonic AS, P.O. Box 24, N-3421 Lierskogen, Norway

e-mail: [email protected]

Find us on the web: www.norsonic.com

Nor265 User Guide

Norsonic AS 3

Contents

1Introduction.................................................................................................................................... 5

2Main application ............................................................................................................................ 6

2.1 Microphone boom ...................................................................................................................................................6

2.1.1 Turntable ............................................................................................................................................................7

3Basic concepts .............................................................................................................................. 8

3.1 Definitions of angles – Home position ...................................................................................................................8

3.2 Speed and acceleration ...........................................................................................................................................9

3.3 Sweep.....................................................................................................................................................................10

4Assembling the Nor265 .............................................................................................................. 11

4.1 General..................................................................................................................................................................11

4.2 Microphone Boom option (Option 1) ...................................................................................................................11

4.3 Turntable option (Option 2)..................................................................................................................................12

4.3.1 Turntable ..........................................................................................................................................................12

4.3.2 Chuck................................................................................................................................................................13

4.4 Remote operation (Option 3) ................................................................................................................................13

5Manual operation......................................................................................................................... 14

5.1 Power.....................................................................................................................................................................14

5.2 Front panel ...........................................................................................................................................................14

5.3 Boom operation.....................................................................................................................................................15

5.4 Turntable operation ..............................................................................................................................................16

6Control from a PC Program Nor1029......................................................................................... 17

6.1 General..................................................................................................................................................................17

6.2 Communication setup ...........................................................................................................................................17

6.3 Main display..........................................................................................................................................................18

6.3.1 Local – Remote .................................................................................................................................................19

6.3.2 Go home............................................................................................................................................................19

6.3.3 Angle indicator .................................................................................................................................................19

6.3.4 Go to .................................................................................................................................................................19

6.3.5 Go relative ........................................................................................................................................................19

6.3.6 Sweep................................................................................................................................................................19

6.3.7 Rotation ............................................................................................................................................................20

6.3.8 Stop ...................................................................................................................................................................20

6.3.9 Error messages .................................................................................................................................................20

6.4 Manual control .....................................................................................................................................................20

7Modifying the user interface ...................................................................................................... 21

8Remote operation........................................................................................................................ 23

8.1 Socket ....................................................................................................................................................................23

8.2 Remote commands ................................................................................................................................................23

8.2.1 General .............................................................................................................................................................23

8.2.2 List of commands ..............................................................................................................................................25

8.2.3 LP command .....................................................................................................................................................27

9Specification ................................................................................................................................ 28

10 Technical design ..................................................................................................................... 29

11 Declaration of conformity.......................................................................................................31

Nor265 User Guide

Norsonic AS 5

1 Introduction

The Microphone boom/Turntable Nor265 may be used as a stand-

alone device to obtain the spatial average of sound level by moving a

measurement microphone back and forth continuously. Main

applications are building acoustic measurements (ISO 140-series),

measurement of sound absorption in a reverberation room (ISO 354)

and determination of sound power levels of sources using sound

pressure (ISO 3741). Due to the oscillating back and forth movement

a normal microphone cable may be fed through the hollow main shaft

without the need for slip rings thereby ensuring very low electrical

noise levels are maintained.

The unit may be equipped with a turntable plate or chuck for

mounting of different test objects. In this configuration the main

application is measurement of directional responses of acoustic

transducers like microphones and loudspeakers.

The unit is manually operated by the rotary switch on the front. As

delivered from the factory eight of the switch positions (1, 2... 8)

corresponds to ±90° and ±180° sweeps with different sweep speeds.

These settings may be redefined by using remote commands if the unit

is equipped for remote operation.

Extended control of the device is possible by

remote commands from a computer by use of the

optional serial interface. This allows accurate

control of angular position, speed and acceleration.

The unit is robust and constructed for years of

maintenance-free operation.

When a movement or sweep is started, the speed

will gradually increase as specified by the

acceleration instruction until the selected speed is

obtained. The reversed speed-profile is used for

deceleration. By specifying a higher value for the

acceleration time, even a large or heavy object may

be handled.

Nor-265 uses a digital signal processor (DSP) to

obtain accurate positioning with simple and robust

mechanical design. Accuracy in speed and

acceleration are ensured by the use of a precision a

crystal clock. The design allows a unique

combination of specifications suitable for

microphone boom applications as well as a general

turntable.

The sound emission from the unit is very low,

especially when operated at the slower speeds.

Nor265 User Guide

6 Norsonic AS

2 Main application

2.1 Microphone boom

A number of applications

require measurement of the

spatial average of the sound

pressure level in a room. The

average level may be

obtained by measuring the

level in different positions

and then calculation of the

average level.

Nor265 may be used for

moving the microphone from

position to position or the

average may be obtained by

moving the microphone

continuously while

measuring the average sound

level.

Normally the energetic

average is required. This

may be obtained directly by

use of an integrating-

averaging sound level meter

set to indicate the time-

average sound level Leq.

Nor265 is normally set up

to produce an oscillating

angular movement

backwards and forwards. The

time for a complete period

may be specified. The

integration time for the

measurement is normally set

to one or a whole number of oscillations.

When delivered, the switch for manual operation is pre-programmed

to default sweeps of ±90° and ±180°, respectively. If Nor265 is

equipped for remote operation (option), the user interface may be used

to re-programme these settings to obtain other sweeps or to obtain

specified positions. The reprogramming of the user interface is most

easily done with the MS Windows program Nor1029 accompany-

ing the remote operation option. Up to eight positions may be selected

by the switch on the front. The positions may be programmed by use

of the serial interface and will be stored in the internal memory of the

device. Alternatively, the switch may be programmed to contain a

start angle and a fixed step angle. By the use of remote commands and

the accompanying MS Windows program, full control of movements

and positions are obtained.

Average sound level

If Liis the sound pressure level in

microphone position i = 1... N, the

average sound level is calculated

by:

∑

110

Nor265 User Guide

Norsonic AS 7

Both the electrical and acoustic noise generated by Nor265, even

during movement, is very low and allows measurement down to very

low levels.

The figure shows a typical set-up for Nor265 used as a microphone

boom. The main body is mounted on a tripod with the microphone

mounted at the end of the boom opposite to the counter-weight. A

normal microphone cable is fed through the hollow shaft.

2.1.1 Turntable

Nor265 may be used to rotate

a device continuously or to

move it to a specified angle.

The speed and acceleration for

a movement may be specified

accurately within a wide range.

Main application is

measurement of directional

response of an acoustic

transducer. Although the

turning moment is limited to

prevent damage, theNor265

may carry significant loads.

The position and the speed are computer controlled and ensure a

smooth and safe movement from one position to another. Remote

commands facilitate computer control and fully automatic

measurements.

Nor265 may be mounted in any position, even upside down. The

main shaft is hollow and allows the entrance of signal cables.

Nor265 User Guide

8 Norsonic AS

3 Basic concepts

3.1 Definitions of angles – Home position

When the turntable is switched on, the actual position of the table is

set as the reference angle 0°. Rotational angles are defined relative to

this angle. Positive angles are counter-clockwise as seen from the top

of the table. The angles are given in degrees. A full turn corresponds

to 360°.

The reference angle may also be set to a hardware defined, fixed

angle, called the home position. The home position may be

automatically detected by performing a "Go Home" command, either

from the user interface or as a remote command. After the start of the

command, the table will turn 5 degrees clockwise and then counter-

clockwise until the home position is detected. When the home position

is detected, this position will be defined as 0°. A light emitting diode

(LED) marked ‘Home’ on the front indicates the status for the home

position. The LED will flash until the home position is detected, and

thereafter light continuously.

The range for angles is very wide and corresponds to more than 600

000 full rotations in both directions. The figure below shows the range

of angles for ± 360°, corresponding to two complete revolutions.

120

150

180

210

240

270

300

330

360

-30

-60

-90

-120

-150

-180

-210

-240

-270

-300

-330 -360

Nor265 User Guide

Norsonic AS 9

3.2 Speed and acceleration

The speed and acceleration may be set by the user. The speed is

specified as time per revolution (second/revolution). The acceleration

is specified as the time (second) it takes to obtain the specified speed.

The same time is used for deceleration. The default value is 2 seconds.

If a large or heavy object is placed on the table, a larger value for

acceleration time should be used in order to limit the torque needed.

The speed and the angle as the function of time are shown on the

figure below.

Ta Ta time

Speed

time

tot

Nor265 User Guide

10 Norsonic AS

3.3 Sweep

The sweep time is the total time required to perform a complete sweep

back and forth including acceleration and deceleration. See figure

below for a sweep from angle A to angle B:

360

-360

Angleofrotation

Time

ST SP

Sweep time

When the sweep is started, the sweep may be described as a

consecutive sequence of "Go to A", "Go to B", "Go to A" etc. until the

sweep is stopped. The specified acceleration time is used for

acceleration and deceleration. When the sweep is started manually, the

default vale for acceleration time is used.

Vibrations

See section 10 Technical design of how to reduce resonance-

amplified vibrations.

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