NTi Audio Minilyzer ML1 - Manual (Page 8)

8
Overview
The Minilyzer ML1 is a sophisticated audio test instrument, supporting
a wide range of useful measurement functions. The results are
displayed on a large LCD with backlight:
• Level RMS, Relative or SPL (Sound Pressure Level)
• THD+N (Total Harmonic Distortion + Noise)
• vu-Indicator and PPM (Peak Program Meter)
• Frequency
• Polarity Test (in combination with NTi Audio’s Minirator)
• Signal Balance Error
• Sweep recording with respect to frequency or time
• 1/3 rd Octave Spectrum RMS or SPL
• Scope
Additionally, several input filters are available, depending on the active
measurement function:
• A-weighting acc. IEC 61672
• C-message acc. CCIR 468-4
• 22 Hz Highpass acc. DIN 45045, -120 dB / dec.
• 60 Hz Highpass acc. DIN 45045, -120 dB / dec.
• 400 Hz Highpass acc. DIN 45045, -120 dB / dec.
• Voice Bandpass acc. ITU-T P.48
• C-weighting acc. IEC 61672
• X-Curve -1 acc. ISO 2969
The X-Curve -1 filter is especially applicable for the recording,
monitoring and play-back of wide range soundtracks in indoor
theatres, review rooms or cinemas. To measure the acoustic
response in such rooms e.g. the Minirator MR1 shall be used with
the pink noise signal selected. Via the Minilyzer the 1/3 rd octave
spectrum has to be recorded using the X-Curve -1 filter. According
the ISO-norm the result shall be a flat graph (a continuous noise
spectrum having constant energy per 1/3 rd octave bandwidth).
A setup screen allows to adjust four settings according to the specific
demands of the user:
• Auto power off duration
• Auto backlight off duration
• LCD contrast
• Multiple setup (individual settings for up to 4 users)
Introduction