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Användningsområden
- Byggakustikmätningar enligt ISO 10140
- Efterklangstidsmätningar enligt ISO 354
- Ljudeffektmätningar enligt ISO 3740
- Riktingsresponsmätningar av högtalare och mikrofoner
Om Nor265A
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. Nor265 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.
Funktioner
- Oscillating microphone boom for spatial averaging in building acoustics or sound power measurements.
- Building acoustics measurements in accordance with ISO 10140 and ISO 16283.
- Reverberation time measurements in accordance with ISO 354.
- Sound Power measurements in accordance with ISO 3740 series.
- Directional response measurements of loudspeakers and microphones.
- Accurate positioning.
- Sweep of ±90º and ±180º.
- Direct control or remote control from a PC via LAN interface.
- User defined sweeps. Selectable sweep times.
- Supported by Nor850.
- LAN interface.
- Nor265 may be equipped with a turntable (optionally).
Specifikationer
Mounting: Tripod which 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 plate – diameter: 300 mm (option 2)
Chuck (2 – 13 mm) (option 2)
Boom radius: 0.8 – 2 m (continuously adjustable)
Rotation angle:
Programmable / any angle.
May also be set to rotate continuously at a specified direction and speed.
Resolution: 0.01°
Angle accuracy (no torque):
Better than 0.8°.
Typical better than 0.05° if moved in same direction.
Max load (any direction): 500 N
Max torque loading: 1.6 Nm
Typical error from loading torque: 0.3 deg/Nm
Power supply: 85-264VAC / 47-63Hz
Fuses: 2.5 A slow blow (IEC 60127)
Remote operation: LAN
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 on the boom – 1,5 m from the main body.
Temperature range: -10 to 50 °C
Humidity: 0 – 90 %RH
Nedladdningar
Brochurer
Product range catalogue
Software
Nor1029
-
PC control for Nor265A (Nor265)
Ljudmätare
Nor150 2-kanals ljudmätare
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