NTi Audio Digilyzer DL1 - Manual (Page 12)

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Debugging or listening?
The built-in speaker on the rear side gives the acoustical response of
the measured signal – everywhere and any time – without the need
of a headphone. For the users convenience a good headphone may
be connected for listening in superior quality (up to 24 bit / 96 kHz).
The headphone output may be used as D/A converter, e.g. some
recording with a minidisc-player is requested but no analog output
is available.
oops – no signal!
Often no signal is found during troubleshooting at digital audio lines.
Can this be? The Digilyzer offers a digital realized “AGC” (automatic
gain control) to “zoom up” the digital signal. So even a change of the
LSB (least significant bit) is fully audible. The tremendous dynamic
range of 140 dB allows to listen to the smallest disturbances. For
example someone just has closed the fader or muted the signal, so
just activate the AGC and listen; even dither noise will be audible.
All the above monitoring functionalities can be controlled by using
hotkeys, displayed in the FAST ACCESS SETUP menu.
dual domain measurements
Level RMS and distortion (THD+N) measurements are fundamental to
check A/D converters. The complete test system even checks mixed
mode applications such as A/D converters or digital mixers is available
in combination with the analog signal generator Minirator MR1.
Overview
Hotkey-symbol
Description
hotkey AGC
ON/OFF
Fig 2-08, Automatic gain control