User Manual PS 278 / Issue 2 © 1996 ASL Intercom, Utrecht, Holland.
10
12.0 TECHNICAL SPECIFICATIONS PS 278
POWER SUPPLY
mains voltage range 115 V units: 100 - 125 V 60Hz AC
230 V units: 210 - 250 V 50Hz AC
DC output voltage +30 V +/-5% DC
ripple and noise < 11 mV rms
max. output current 1.7 A continuous / 3 A peak
circuit-breaker delay time 0.2 sec.
automatic reset time 3.0 sec.
AUX INPUT
input impedance 30 Kohms (balanced line level)
4.6 Kohms (balanced mic level)
nominal input level -18 dBu to +6 dBu (line level)
-38 dBu to -14 dBu (mic level)
max. input level +22 dBu (line level)
+2 dBu (mic level)
phantom power +30 V DC (mic level selected)
MIC. PREAMP
mic. impedance 200 ohms
gain 40 dB - 70 dB (adjustable internally)
presence filter +6 dB at 5 kHz
frequency response 200 Hz - 13 kHz (-6 dB)
V electret mic + 9 V DC
HEADPHONES DRIVER AMP
max. load 200 ohms
max. output level normal 14 V rms (200 ohms)
binaural 8 V rms (400 ohms)
max. output power normal 0.5 W rms (each can)
binaural 0.16 W rms (each can)
SIDETONE
rejection 0 - 30 dB adjustable
BUZZER
max. SPL 100 dBA
DIMENSIONS AND WEIGHT
width 19" (483 mm)
height 1U (44.5 mm)
depth 150 mm
weight 2.75 Kg
GENERAL SYSTEM SPECIFICATIONS
intercom line impedance 350 ohms (1kHz)
2.2 Kohms (DC)
intercom line audio level nom. -18 dBu
max. +4 dBu
dynamic range 80 dB
call send signal 2.8 mA
call receive signal threshold +2.4 V DC
supply voltage +30 V DC (12 V to 32 V)
mic mute power interrupt time 0.1 sec
Note: 0 dBu = 775 mV into open circuit.
ASL reserves the right to alter specifications without further
notice.
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