External Connections
How a device is set up for testing depends on the type and function of
the device.
Concepts and Terminology
Balanced vs. Unbalanced
A major division exists between balanced and unbalanced
connections. Most consumer devices uses unbalanced connections.
Most professional devices use balanced connections.
Unbalanced connections only require two wires: one to carry the signal
and one to carry the ground. Balanced connections require three
wires: two to carry the signal and one to carry the ground.
Balanced connections are generally used in professional applications
because of their higher immunity to interference and noise.
Unbalanced connections are generally used in consumer applications
because they are less expensive.
The most common unbalanced connectors are the RCA (or ‘phono’)
connector, the BNC connector, and the 1/4" Phone connector.
The most common balanced connector is the 3-pin XLR connector.
XLR connections are almost always balanced, although sometimes the
XLR connector can be used in balanced or unbalanced configurations,
as in the Portable One Plus Access.
3
Connecting
Portable One Plus Access User's Manual 3-1
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