Samlexpower PSE-12125A, Owner'S Manual

Page: 14 / 52

14 | SAMLEX AMERICA INC.
The inverter contains internal switching devices which generate conducted and radiated
electromagnetic interference (EMI). The EMI is more pronounced in inverters whose
output voltage has modified sine wave form as modified sine wave form is composed
of odd harmonics of the fundamental frequency (60 hz). These harmonics may produce
buzzing sound in inexpensive stereo systems because the power supply of these systems
does not provide adequate filtration. In such cased, use stereo systems with better qual-
ity power supply.
The magnitude of EMI is limited to acceptable levels by circuit design, but cannot be en-
tirely eliminated. The effects of EMI will also depend upon a number of factors external
to the power supply, like proximity of the inverter to the EMI receptors, types and qual-
ity of connecting wires and cables, etc. EMI due to factors external to the inverter can be
reduced as follows:
- Ensure the inverter is firmly grounded to the ground system of the building
or vehicle.
- locate the inverter as far away from EMI receptors like radio, audio and
video devices as possible.
- keep the dc side cables between the battery and the inverter as short as possible.
- Twist the dc side cables. This will partially cancel out the radiated noise from
the cables.
- Shield the dc side cables with metal sheathing / copper foil / braiding.
- use co-axial shielded cable for all antenna inputs (instead of 300 ohm twin leads).
- use high quality, shielded cables to attache audio and video devices to one another.
- do not operate other high power loads when operating audio / video equipment.
seCtIOn 5 | limiting electro-magnetic
Interference (eMI)