Download 788T User Guide and Technical Information

788T User Guide and Technical Information
Peak/VU
Peak/VU mode will display VU and Peak level information simultaneously. In this mode, the perceived loudness (VU) is displayed as it is in VU mode, and the Peak level is indicated by the uppermost LED. With this combination the user gets the best of both VU and Peak metering by seeing both
the perceived loudness and the peaks of the signal at the same time. Peak/VU is the factory default.
Peak Hold Time
Peak-hold indicators are useful for metering in applications when an overload condition is unacceptable or when program material must not exceed a prescribed threshold. The Peak Hold Time is
user selectable in the Setup Menu option METER: PEAK HOLD TIME. The peak LED will hold its
position for the selected duration from 0 to 5 seconds in .1 second increments. This allows for easy
viewing of peak values that could otherwise go unnoticed.
Input Activity Ring LEDs
The LEDs surrounding the Input gain pots indicate the input activity for each input respectively. The
LEDs illuminate in various colors and intensities to represent the state of each input.
LED Color
Description
Green
Analog and digital input signal presence. LED brightness intensifies as the amplitude of the input
signal increases.
Red
Input signal has reached the user-defined Input Peak Threshold. The threshold level is set in the
Setup Menu option Meter: Input Peak Threshold from -20 to -1 dBFS.
Yellow
Input limiter is attenuating. LED brightness intensifies as the input signal increases.
Flashing Yellow
Input type has been selected to digital but the input is not currently locked.
i.e. No digital input has been detected. All eight input activity LEDs will flash yellow when a video or
word clock reference has been selected but a valid source is not detected.
If a digital input has been selected and the 788T detects a valid digital signal, the Input Ring LEDs
will follow the normal red and green LED behavior. The Input Activity Ring LEDs can be defeated
by color in the Setup Menu option METER: INPUT LED RING MODE.
Headphone Peak LED
The headphone circuit has an indicator for peak overload. Monitoring without a visual indication
of headphone clipping may mislead the operator into thinking that the record or playback signal is
distorting.
Tone Oscillator
The tone oscillator can be used as an aid to lining up levels. Both tone level and frequency are user
selectable. Reference level is adjustable over a range of −40 to 0 dBFS in the Setup Menu option
TONE: LEVEL. Reference tone frequency is adjustable from 100 to 10,000 Hz in the Setup Menu option TONE: FREQUENCY. Standard tone levels vary according to the practices and needs of production and post-production, but are generally in the –20 to −12 dBFS range.
The tone oscillator is activated by pressing the
TONE key. Tone is only active while the TONE
key is pressed. Tone is routed where specified in the Setup Menu option TONE: MODE. Routing
choices include: Outputs only, Outputs and Tracks, Tracks only, or no tone routing (disabled). When
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v. 1.51
Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.