NTi Audio Minilyzer ML1 - Manual (Page 27)

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THd+N
In this mode the Minilyzer measures the THD+N (Total Harmonic
Distortion + Noise) and the k2 - k5 harmonic distortion.
Fig 3.10 THD+N Meter Panel
Input Level
(RMS)
The measurement is carried out in the band from 10 Hz - 20 kHz,
expressed in dB or in %. Simultaneously, the LCD shows the actual
RMS input level or the 2nd, 3rd, 4th & 5th harmonics distortion below
the THD+N result.
NOTE The THD+N results are calculated using a restricted
measuring bandwidth of 10 Hz - 20 kHz.
Besides checking the linear purity of a sine signal - e.g. measuring
amount of harmonic distortions - this measurement mode is
particularly suited to get a quick idea whether unwanted disturbances
like hum are present.
Measurement Functions