FFT Analyzer Basic FAQ

In sound measurement, factors such as microphone sensitivity, preamplifier gain (insertion loss), and microphone amplifier gain are involved, and the reference value is not 1 EU (the reference value for sound pressure level is 20 μPa). Therefore, FFT analyzers are usually calibration using a calibration signal (AC signal) from an acoustic calibration. In other words, the voltage level value of the AC signal (usually a sine wave) corresponding to the specified sound pressure level generated by the acoustic calibration is read by the FFT analyzer, and this value is converted to the specified sound pressure level value. This allows for direct reading of any peak or overall value of the power spectrum in terms of sound pressure level (unit: dB).

For specific operating procedures, please refer to the related sections.

	Simple calibration method for DS-0221 and sound level meter (FFT analyzer FAQ) DS-2000 Quick Start Guide "Noise Measurement" (PDF) (FFT Analyzer FAQ) DS-2000 Quick Start Guide: "Method for Unit calibration of MI-1233 Microphone and MI-3100 Preamplifier" (PDF) (FFT Analyzer FAQ) CF-7200 Quick Start Guide "Noise Analysis Procedure" (PDF) (FFT Analyzer FAQ)