© 2010 Wohler Technologies, Inc. All rights reserved.
4
AMPx-SDA User Guide
Features
Audio Connections
Connection of the audio feeds is straightforward. For digital inputs,
Impedances are 75
Ω
for the unbalanced BNC connectors and 110
Ω
for
the balanced XLR connectors. Analog inputs have an impedance of 40k
Ω
for the balanced XLR connectors. Care should be exercised to avoid
mismatched cable types and other similar causes of undesired
reflections in RF signal systems.
Electrical Interference
As with any audio equipment, maximum immunity from electrical
interference requires the use of shielded cable; however, satisfactory
results can sometimes be obtained without it. The internal circuitry
common is connected to the chassis.
AC Power
The unit's AC mains connection is via a standard IEC inlet, with safety
ground connected directly to the unit's chassis. The universal AC input
(100-240VAC, 50/60Hz) switching power supply is a self-resetting
sealed type, with automatic over-voltage and over-current shutdown.
There is no user-replaceable fuse in either the primary or secondary
circuit.
Features
•
Excellent high frequency response for positive detection of
background whine and noise
•
Audible and visual indication of phase/polarity problems
•
Thorough magnetic shielding for placement next to video monitors
•
Two high-resolution 26-segment tri-color LED bar graph level
meters
•
SDI input and loop-through on unbalanced BNC connectors