NTi Audio Acoustilyzer AL1 - Manual (Page 52)

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Electrical Measurements - RMS/THD
The Acoustilyzer supports basic electrical measurement functions,
such as
• Level RMS - Root Mean Square; reflects the absolute level of the line
input signal.
• THD+N - Total Harmonic Distortion plus Noise; besides checking the
linear purity of a sine signal - e.g. measuring the amount of harmonic
distortions - this mode is particularly suited to get a quick idea whether
unwanted interferences, like hum, are present.
Distortion
THD+N
Signal
Frequency
Signal Balance
Indicator
Level RMS
Result and Unit
Level RMS: The units dBu, dBV, dBSPL and V are selectable.
Distortion THD+N: The distortion measurement, expressed in dB or %, is
carried out in the bandwidth 10 Hz - 20 kHz.