ASL INTERCOM PS 430 Kullanıcı Kılavuzu - Sayfa 6
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7.0
INTERNAL CONTROLS
MIC GAIN trimmers
Inside the unit there are two trimmers to adjust the
mic gain of the gooseneck microphone and the
headset microphone separately.
These internal controls are located on a PC board.
8.0
TECHNICAL SPECIFICATIONS PS 430
System
dynamic range: 80 dB
call send signal: +2.8 mA
call signal threshold (receive): +2.4 V DC
supply voltage: +30 V DC (12 - 32 V DC)
power interrupt time (mic mute): 0.1 sec
Intercom Line
Impedance: 350 Ω (1kHz), 2.2 kΩ (DC)
audio level: nom. -18 dBu, max. +4 dBu
Mic. Pre-amps
gooseneck mic: noise cancelling electret
headset mic. impedance: 200 Ω
gain: 40 - 60 dB (adjustable internally)
presence filter: +6 dB at 5 kHz
frequency response: 200 Hz - 13 kHz (-3 dB)
power to electret mic: +9 V DC
Side Tone
Rejection: 0 - 30dB adjustable
Buzzer
max. SPL: 85 dBA
9.0
PARTY LINE, TECHNICAL CONCEPT
User stations in an ASL intercom system are
connected via one or several 'party lines'.
A party line offers two way ('full duplex')
communication and consists of standard
microphone (multi-pair) cable. One wire is used as
an audio line, one as a power line and the screen
of the cable functions as earth/return.
Current drive is used for signal transfer.
Each station utilizes a current amplifier to amplify
the microphone signal and place it on the common
audio line where, due to the constant line
impedance (situated in the power supply between
XLR pin 3 and 1), a signal voltage is developed
which can be further amplified and sent to the
headphones or loudspeakers.
ASL reserves the right to alter specifications without prior notice
User Manual PS 430 / Issue 2011 © ASL Intercom BV
.
They can be reached as follows :
o
remove the screws of the bottom plate
o
slide the plate to one side and take it out
o
take away the plastic isolation plate
The trimmers are labeled 'GOOSE' for the
gooseneck microphone and 'HEADS' for the
headset microphone
Speaker Driver Amp
speaker impedance: 25 Ω
max. output power: 2.9 W rms
Headphones Driver Amps
max. output level:
monaural: 14 V rms @ 200 Ω
binaural: 2x 10.6 V rms @ 400 Ω
max. output power:
monaural: 1 W rms @ 200 Ω
binaural: 2x 0.28 W rms @ 400 Ω
Power Consumption PS 430
current (at 30 V DC):
70 mA quiescent
105 mA signaling
230 mA at max. output + signaling
Dimensions & Weight PS 430
width:
283mm
height:
88 mm
depth:
42/48 mm sloping
weight:
1550 grams
0 dBu defined as 775 mV into open circuit
This principle has three advantages:
the use of a single audio line allows several
stations to talk and listen simultaneously
due to the high bridging impedance offered
by each station, the number of stations on
the party line has no influence on the level of
the communications signal
power and audio to the intercom stations
use the same cable
The Call signal is also sent as a current on the audio
line. It develops a DC potential over the line
impedance which will be sensed by each station and
interpreted as a Call signal.
PAGE 6