PAGE 5
User Manual BS 286 / February 2011 © ASL Intercom BV
7.0
FRONT PANEL CONTROLS & CONNECTOR
1
POWER ON/OFF switch
Mains power push button for switching ON and OFF
the internal power supply.
2
MAINS POWER LED
This LED illuminates if the unit is switched on.
3
AUX VOLUME control knobs
These knobs adjust the level of the AUX input to
each of the two intercom lines.
8.0
REAR PANEL CONTROLS & CONNECTORS
4
A & B LINE connectors
These XLR-3 type connectors are for connecting
remote stations, using standard microphone cable.
There are 2 connectors for channel A and 2
connectors for channel B.
Pin assignments:
Pin 1: 0V / ground shield
Pin 2: +30V DC power wire
Pin 3: audio wire
5
AUX INPUT connector
This XLR-3 input is electronically balanced and
accepts audio levels between
–18 dBu to +22 dBu
on line level, and
–38 dBu to +2 dBu on mic level.
Pin assignments :
Pin 1. 0V / ground
Pin 2:
Pin 3: signal
–
Next to the AUX input is an INPUT LEVEL switch for
selecting either line level or mic level. When mic
level is selected, +30V DC phantom power is
supplied to pin 2 and 3 of the AUX input connector.
With the MIC GAIN trimmer one can adjust the input
sensitivity when mic level is selected.
6
FUSE Holder
The fuse protects the BS 286 against severe internal
damage, in case of malfunction in the power section.
Before replacing a fuse the mains cord must be
disconnected from the mains outlet.
7
MAINS Inlet
IEC Mains connector
9.0
TECHNICAL SPECIFICATIONS
System
Dynamic range: 80 dB (1kHz, THD <1%)
Call signal (send): +2.8 mA
Call signal threshold (receive): +2.4 V DC
Supply voltage: +30 V DC (12 V to 32 V)
Intercom line
Impedance: 350 Ω (1 kHz), 2.2 kΩ (DC)
Audio level: nom. -18 dBu, max. +4 dBu
Switch Mode Power Supply
Mains voltage: 100 - 240 V AC, 50/60 Hz
Output voltage: +30 V DC (+/- 5%)
Max output power: 45 W
Max power consumption BS 286: 60 watts
Aux Input
Input Impedance:
30 kOhms (line level)
4.6 kOhms (mic level)
Nominal Input Level:
-18 to +6 dBu (line level)
-38 to -14 dBu (mic level)
Max. Input Level:
+22 dBu (line level)
+2 dBu (mic level)
Phantom Power: +30 V DC (when mic level is
selected)
0 dBu defined as 775 mV rms into open circuit.
ASL reserves the right to change specifications without prior notice
