NTi Audio Digilyzer DL1 - Manual (Page 39)

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vu+ppM
The Digilyzer offers a combined VU and PPM meter for two channels
(stereo). This combination enables a quick and accurate overview on
the momentary peak level and RMS value (power of the signal, which
tends to be an indication for the volume).
Numerical peak hold indicates the all-time max. input peak level
of each channel since the VU+PPM mode has been entered. It
may be reset by placing the cursor on this value and pressing
the return key.
Over indicator: Clipping indication; the number of full scale values
causing this clipping indication may be adjusted in the SET menu
(PPM OVER THRESH).
vu+ppM Indication: Digilyzer features
• VU, volume units indicated as the thick bar; displays the average
volume level of the audio signal.
• PPM, peak program meter indicated as the center bar; displays
the peak level of the audio signal.
Measurement Functions
Fig 5-30, VU+PPM panel
Channel A
VU meter
(thick bar)
Numerical
peak hold
PPM meter
(thin bar)
Channel B
Over
indicator
Peak hold
for PPM