NTi Audio Acoustilyzer AL1 - Manual (Page 23)

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4. Measurement Functions
Overview
Function
Test
Result
Screens
Test Features
SPL/RTA Sound Level Meter
Sound pressure level SPL, MAX/MIN SPL, Leq,
LCpeak
Real Time Analyzer
1/1 and 1/3 octave real time spectrum analyzer
showing SPL, MAX/MIN SPL & Leq per band
RT60 Reverberation Time
in octave band resolution based on T20 results
Reverberation Time
detailed test results listed in seconds, including
correlation factor
FFT Real-time Zoom FFT
POLARITY Polarity Test
of acoustic speaker or electrical line signals
DELAY Delay Time
Propagation delay measurement between
electrical reference and acoustic signal
RMS/THD Electrical Measurements
Level RMS, THD+N, Frequency
STI-PA Speech intelligibility
with STI or CIS values. V isible after STI-PA
license key has been activated
Speech intelligibility
Individual Leq and STI-PA modulation indices of
test frequency bands
CALIBRTE Calibration Menu
for external measurement microphones,
sensitivity set by default to NTi Audio MiniSPL