Frequently Asked Questions will be updated soon. 
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If a bias error occurs in the visualization of the beamforming map, i.e. if the position of the beamforming map and the noise source are not aligned, the image must be calibrated. For image calibration, you can use 4 kHz of sound waves or other sound waves within the recommended range of 2 to 10 kHz. You can manually find the center of the beamforming map to fit the position of the actual noise source, or use the automatic calibration button. For automatic calibration, first press the Auto Calibration button and drag the center of the beamforming map directly to the center of the noise source. For manual calibration, change the x and y values to match the correct position of the noise source.