AAC-3390
I.R.T. Communications Pty Ltd | www.irtcommunications.com
Page 8 of 11
Revision 04
INSTALLATION
Pre-installation:
Handling:
This equipment may contain or be connected to static sensitive devices and proper static free handling precautions
should be observed.
Where individual circuit cards are stored, they should be placed in antistatic bags. Proper antistatic procedures
should be followed when inserting or removing cards from these bags.
Power:
AC mains supply:
Ensure that operating voltage of unit and local supply voltage match and that correct rating
fuse is installed for local supply.
DC supply:
Ensure that the correct polarity is observed and that DC supply voltage is maintained within
the operating range specified.
Earthing:
The earth path is dependent on the type of frame selected. In every case particular care should be taken to ensure
that the frame is connected to earth for safety reasons. See frame manual for details.
Signal earth:
For safety reasons a connection is made between signal earth and chassis earth.
No attempt should be made to break this connection.
Installation in frame or chassis:
See details in separate manual for selected frame type.
Signal Connections:
Input signal connections are made to the two removable screw terminal blocks at SK1 and SK2.
The audio inputs are bridging > 30 kΩ, if a 600 Ω termination is required close LK1 and LK2 with a wire link soldered
at the LK1 and LK2 positions on the rear panel.
Output signal connections are made to connectors SK3 and SK4 on the selected rear panel of the AAC-3390.
Use rear panel ZAC-3390 for two unbalanced 75 ohms BNC output circuits or rear panel ZAC-3391 for two balanced
100 ohms output circuits.
The reference input signal can be either at SK5 a 75 ohms unbalanced terminating input or at SK6 a 110 ohms
balanced terminating input, the
input selection
is done by links
SW1, SW2 on the module pcb
near pin 32 of the
board connector. Move the links provided to the 75 or 110 positions marked on the board as required. The
reference input signal will then be connected to the appropriate input connector on the rear panel.
The presence of AES signal at the output of the ZAC-3390 can be monitored using the front panel monitoring BNC
socket provided.
