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5
Operation
This section describes in detail the 610's front panel controls and LED indicators.
Operational status
The STATUS button places the 610 in either BYPASS or OPERATE modes. In BYPASS mode
the incoming signals are directly routed (via relays) to the 610's outputs, thereby bypassing any
internal circuitry. In BYPASS mode the front panel and remote controls have no effect on the
operation of the 610. In OPERATE mode, when the delay is active, the incoming signals are
processed through the 610's analog and digital circuitry, and all front panel and remote controls
are fully functional.
It is recommended that the STATUS button remain in the OPERATE (inward) position at all
times. Typically, the 610 would be placed in the BYPASS mode only if the unit were to malfunc-
tion. By design, two circumstances force the 610's audio bypass relays to route the incoming
signal directly to the 610's output. The first being loss of mains (AC) power to the 610 and the
second being the normal operational function of EXIT DELAY (explained in detail below). Once
the 610 has achieved zero time delay as a result of the EXIT DELAY button being pressed, the
audio bypass relays automatically remove the 610 from the signal path until the START DELAY
button is pressed.
There are two LED's associated with the STATUS button. The LED to the left of the button,
labeled DELAY INACTIVE, lights whenever the 610 has been forced to a bypass state. This can
happen automatically as a result of the EXIT DELAY function or manually as a result of moving
the STATUS button to the BYPASS position.
The LED to the right of the STATUS button, labeled DELAY ACTIVE, lights whenever the 610
has been forced to operational status. This happens only as a result of the START DELAY
function (explained in detail below).
INPUT HEADROOM (dB) display
The
INPUT HEADROOM (dB) LEDs indicate the headroom in decibels before the onset of input
clipping. The display indicates the higher (i.e. worst case) of the two incoming stereo channels.
While the 610 has no front panel input level control, a rear panel OPERATING LEVEL button is
provided (see discussion below), allowing you to select between n4dBu and +8dBu
operating levels. Whatever your input levels are, fine adjustment of the input signal must be done
ahead of the 610 (typically with the master buss control fader of the broadcast console).
The incoming signal level should be adjusted so that at least 6dB of headroom is maintained at
all times. As digital devices go, the 610 is very quiet. Therefore, to ensure against any possibility
of clipping, you may wish to decrease input levels even further and operate with as much as 12dB
of headroom.