NTi Audio XL2 Sound Level Meter - Manual (Page 64)

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FFT Analysis + Tolerance
5. Acoustic Analyzer
Besides the comprehensive sound level meter function, the
XL2 Audio and Acoustic Analyzer offers the following acoustic
measurement functions:
FFT Analysis with optional tolerance function •
Reverberation Time RT60 •
Polarity •
Delay time •
1/12 Octave + Tolerance Analysis (optional) •
Noise Curves (optional) •
Speech intelligibility STIPA (optional) •
FFT Analysis + Tolerance
The FFT measurement is the ideal tool for visualization of comb
filters and narrow band effects. It allows a detailed frequency
response investigation of audio and acoustic systems. The XL2
includes an extremely fast, real-time FFT. Optional features
are
High-resolution Zoom-FFT up to 0.4 Hz steps in the fre- •
quency range 5 Hz - 20 kHz provided with optional Extended
Acoustic Pack or the Spectral Limits Option
Capture and tolerance function provided with Spectral Limits
•
Option; thus the main menu function reads FFT + Tol.