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Rotating boom for Building Acoustics - Nor265

Product Code: Nor265

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.

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.

  • Sweep of ±90° and ±180
  • User defined sweeps
  • Selectable sweep time
  • PC control via RS-232 interface
  • User defined fixed positions
  • Accurate positioning of turntable angle
  • Low noise design
  • No noisy slip ring

Specification

Size – main body: Diameter 202mm, Height: 171 mm

Weight: 6 kg

Mounting: Tripod allows inclined traverse plane, diameter of tripod mounting stud: 3/8”

Main axle dimension:

Outer diameter: 30 mm

Inner diameter: > 22 mm

Units to be mounted on turn axle:

Microphone boom (option 1)

Turn table (d=300 mm) (option 2)

Chuck (2 – 13 mm) (option 2)

Boom radius: 0,8 – 2 m (continuously adjustable)

Rotation angle: -241592002° to +241592002° (more than 600.000 revolutions). May also be set to rotate continuously at a specified direction and speed.

Resolution: 0.01°

Angle accuracy (no torque): < 0.8°. Typical. < 0.05° if moved in one direction

Max load (any direction): 500 N

Max torque loading: 2 Nm

Typical error from loading torque: 0.3 deg/Nm

Power supply: 90 – 264V AC / 47 – 440 Hz

Fuses: 2,5 A slow blow (IEC 60127)

Remote operation (option 3): RS-232 interface: 9600 – 115200 baud

Noise emission:

Less than 10 dB A (at rest)

Typical noise A-weighted:

40 dB at 5 sec/rev

27 dB at 10 sec/rev

23 dB at 20 sec/rev

The noise is measured in an anechoic chamber with the moving microphone

placed 1,5 m from the main body.

Temperature range

-10 to 50 °C

Humidity

0 – 90 %RH

Call 01371 871030 to buy

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