Using the Isolation Transformer
7
5 Using the Isolation Transformer
The Isolation Transformers are used for video signals (TR-1); video and
balanced
1
stereo audio signals (TR-3); balanced
1
mono audio signals
(TR-1A); and balanced
1
stereo audio signals (TR-2A).
There are no general rules as to how and where to connect the Isolation
Transformers. This depends on many factors, which relate to the setup of the
studio, improper grounding and so on.
The best method is to disconnect all the equipment and then connect it one by
one, checking for hum, as each piece of equipment is connected. When hum
is detected, the appropriate Isolation Transformer is connected at that point
to break the ground loop.
The Isolation Transformers also provide different grounding combinations,
which are set via the dipswitches for optimum operation.
This section describes how to connect an Isolation Transformer (see section
5.1), and set the dipswitches for optimum performance (see section 5.2).
5.1 Connecting the Isolation Transformer
When installing an Isolation Transformer, you just connect it somewhere on the
line between the source and the acceptor. The particular example in
Figure 5 shows how to connect the TR-3 Video /Audio Isolation Transformers.
However, this is not a specific recommendation, as there are many different
configuration options.
To connect the TR-3, do the following
2
:
1. Connect a video source (for example, a composite video player) to the VIDEO
IN BNC connector.
2. Connect the VIDEO OUT BNC connector to a video acceptor (for example, a
composite video display).
3. Connect a balanced
3
audio stereo signal source (for example, a balanced stereo
audio player) to the AUDIO RIGHT IN terminal block connector and the
AUDIO LEFT IN terminal block connector.
4. Connect the AUDIO RIGHT OUT and the AUDIO LEFT OUT terminal
block connectors to a balanced audio stereo acceptor (for example, a
power amplifier).
5. Turn the power ON on the audio/video sources and acceptors.
1 An unbalanced audio signal can also be used
2 You do not need to connect all the inputs and outputs
3 Or an unbalanced audio signa
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