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5.4 Interference with Electronic Equipment
5.4.1 Buzzing Sound in Audio Systems
Some inexpensive stereo systems and boom-boxes will
emit a buzzing sound from their loudspeakers when
operating from the AC outlet of Portable Power 250. This
is because the power supply in the equipment does not
adequately filter the modified sine wave produced by the
AC inverter. Unless the stereo can be operated directly
from Portable Power 250s 12-volt DC Power Socket, the
only solution is a sound system with a higher quality
internal power filter.
5.4.2 Television Interference
Portable Power 250s AC inverter is shielded to minimize
interference with TV signals. In some cases, particularly
with weak TV signals, some interference may still be
visible in the form of scrolling lines across the screen. In
this case, take the following corrective measures:
1. Use an extension cord to position Portable Power 250
as far away as possible from the television, antenna
and cables.
2. Adjust the orientation of Portable Power 250,
television, antenna and cables to minimize
interference.
3. Maximize TV signal strength by using a better
antenna, and ensure a shielded antenna cable is
used.
4. Try a different TV. Different models of TV sets vary
greatly in their susceptibility to interference.
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