Benchmark ADC16 Instruction Manual download pdf (Page 12)

ADC16 Instruction Manual – Rev A Page 12

Meter Display

The ADC16 is equipped with a multi-function

9-segment LED meter. The 'SCALE' button

selects either a 6 dB step or 1 dB step scale

and controls the peak-hold function. Metering

is fully digital and post-conversion for

absolute accuracy. The units are dBFS (dB

relative to the maximum possible digital

signal).

Time constants are built into the meters so all

transient peaks can be observed easily. If a

transient peak has a duration as short as one

digital sample, an LED will be illuminated and

remain illuminated long enough to be

observed by the human eye.

A peak indication mimics the action of the

needle on a peak-reading analog meter, while

the remaining LEDs will follow the

instantaneous level of the audio.

The red 0 LED indicates that a full-scale

digital code has been reached and that digital

clipping has occurred. Full-scale events as

short as one digital sample will light the 0

LED. Short single-sample digital clipping

events are often audible, and all 0-dBFS

events should be avoided.

The ADC16 has a very large dynamic range.

It is wise to use some of this dynamic range

to provide more headroom as insurance

against clipping. Leave some extra headroom

between your highest anticipated peak and

the red 0 dBFS LED.

Meter Scale and Peak Hold

The 'SCALE' button selects the scale and

peak-hold mode of the 9-segment LED Meter

Display.

Meter Scale and Peak Hold

Function Selection

Press the 'SCALE' button momentarily to

enable or disable the Peak Hold function.

Press and hold the 'SCALE' button to switch

the scale between 1 dB steps and 6 dB steps.

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