ASL INTERCOM PRO Series Посібник користувача - Сторінка 10
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PARTY LINE, TECHNICAL CONCEPT
ASL's PRO Series offers a complete two way ('full
duplex') communications system.
Users of the system are connected via a 'party line'.
Master stations (with built-in power supply), beltpacks,
speaker stations and power supplies are
interconnected via standard microphone 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
utilises 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 headphones or loudspeakers.
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 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.
9.0 GUARANTEE
This unit is warranted by ASL Intercom to the original
end-user purchaser against defects in workmanship
and materials in it's manufacture for a period of one
year from date of shipment to the end-user.
Faults arising from misuse, unauthorised
modifications or accidents are not covered by this
warranty. If the unit is faulty it should be sent in it's
original packing, to the supplier or your local ASL
dealer, with shipping prepaid. A note must be included
stating the faults found and a copy of the original
suppliers invoice.
THIS PRODUCT WAS DESIGNED, DEVELOPED AND
MANUFACTURED BY:
ASL-intercom
MAARSSEN (UTRECHT) HOLLAND.
E-mail
Website : http://www.asl-inter.com
10
10.0 TECHNICAL SPECIFICATIONS PS 630
POWER CONSUMPTION
current (at 30 V DC)
MIC. PREAMP
gooseneck microphone type noise cancelling electret
headset mic. impedance
gain
presence filter
frequency response
V electret mic
HEADPHONES DRIVER AMP
max. load
max. output level
max. output power
SPEAKER DRIVER AMP
speaker impedance
max. output power
INTERCOM LINE DRIVER
max. output current
output impedance
SIDETONE
rejection
BUZZER
max. SPL
DIMENSIONS AND WEIGHT
width
height
depth
weight
GENERAL SYSTEM SPECIFICATIONS
intercom line impedance
intercom line audio level
dynamic range
call send signal
call receive signal threshold
supply voltage
mic mute power interrupt time
Note: 0 dBu = 775 mV into open circuit
ASL reserve the right to alter specifications without
further notice.
User Manual PS 630 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.
105 mA quiescent
140 mA signalling
280 mA at max. output + signalling
40 dB - 70 dB (adjustable internally)
+6 dB at 5 kHz
200 Hz - 13 kHz (-3 dB)
normal 14 V rms (200 ohms)
binaural 8 V rms (400 ohms)
normal 0.5 W rms (each can)
binaural 0.16 W rms (each can)
> 150 Kohms
0 - 30dB adjustable
350 ohms (1kHz)
2.2 Kohms (DC)
nom. -18 dBu
max. +4 dBu
+30 V DC (12 V to 32 V)
200 ohms
+9 V DC
200 ohms
50 ohms
1.3 W rms
3 mA rms
100 dBA
337 mm
87 mm
155 mm
2.94 Kg
80 dB
+2.8 mA
+2.4 V DC
0.1 sec