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Polar Far-Field Measurement (POL)

Features and Benefits

Balloon plot of SPL versus angles θ and φ at 2 kHz
  • Measurement under free field condition
  • Directivity in polar coordinates
  • Automatic control of turn-tables
  • 2D and 3D display modes (polar, baloon)
  • Open export interface (ASCII)

The POL module offers a fully automated measurement of the sound pressure on a spherical surface under free-field conditions in polar coordinates φ, θ and r. The measurement distance (r) should be larger than the largest dimension (d) of the device (r>>d) and the longest wavelength (r>>λ) to measure directivity in the far field.

Polar plot showing horizontal and vertical SPL at three frequencies


Klippel Analyzer 3 OR Distortion Analyzer 2 hardware
dB-Lab Software (version 210 or higher)
TRF Module
VACS Software by R&D Team
Power Amplifier
Turn table

Templates coming with the software

Polar plot measurement with angular resolution of 10 degree.


Germany: 102013000684; USA: 9,584,939B2; China: 2014100795121

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