2-8 Connecting Analog Input Models
The Bright-VU accepts balanced or unbalanced in-
puts via rear panel XLR connectors on analog input
only models or 3-circuit 1/4" phone plugs on dual input
models. The connectors are wired as follows:
Balanced Connection
Pin 1 or Sleeve
Shield
Pin 2 or Tip
Pin 3 or Ring
Signal -
Unbalanced Connection
Pin 1 or Sleeve
Shield
Pin 2 or Tip
Center Hot
Pin 3 or Ring
Connect to pin 1
The Bright-VU shield pins are bonded directly to
the chassis at the connector and do not share any
ground paths with the internal circuitry. This allows ca-
ble shields to be connected at both ends without caus-
ing hum problems.
The zero reference level for each input can be set
anywhere between -10 dBu and +20 dBu by adjusting
the multiturn gain control located adjacent to each in-
put connector. A small flat blade screwdriver is
needed to adjust the gain.
2-9 Alarm Output
Bright-VU units ordered with the alarm option have
a SPST relay closure that can be triggered by several
selectable fault conditions. The relay contacts are
brought out on the rear panel terminal block.
The alarm function is controlled by an eight position
DIP switch located on the DSP control card inside the
enclosure. To gain access to the DIP switch you must
remove the meter cover plate. The following tables de-
scribe the alarm parameters available.
Alarm Control
Sw7
Function
Off
Alarm output OFF
On
Alarm output ON
Too Low Alarm
Sw1
Sw2
Function
Off
Off
-20 dB below 0 dB
Off
On
-30 dB below 0 dB
On
Off
-35 dB below 0 dB
On
On
-45 dB below 0 dB
Too High Alarm
Sw3
Sw4
Function
Off
Off
+3 dB above 0 dB
Off
On
+6 dB above 0 dB
On
Off
+9 dB above 0 dB
On
On
+12 dB above 0 dB
Alarm Activation Delay
Sw5
Sw6
Function
Off
Off
30 Seconds of continuous fault
Off
On
60 Seconds of continuous fault
On
Off
120 Seconds of continuous fault
On
On
300 Seconds of continuous fault
Peak Display Control
Sw8
Function
Off
Peak Dot OFF
On
Peak Dot ON
The alarm output is available on the rear panel DIN
connector. All alarms within a single unit share the
same relay. Wire a 5-pin male DIN connector as fol-
lows:
Page 6
** Bright-VU Instruction Manual **
Male DIN solder side
Relay -
Relay +
