14
LIMITING ELECTRO – MAGNETIC INTERFERENCE
(EMI)
The XM Series UPS contains internal switching devices which generate conducted and radiated
electromagnetic interference (EMI).
The magnitude of EMI is limited to acceptable levels by circuit design but can not be entirely
eliminated. The effects of EMI will also depend upon a number of factors external to the power
supply like proximity of the XM Series UPS to the EMI receptors, types and quality of
connecting wires and cables etc. EMI due to factors external to the XM Series UPS can be
reduced as follows:
- Ensure that the XM Series UPS is firmly grounded to the ground system of the building
or the vehicle
- Locate the XM Series UPS as far away from the EMI receptors like Radio, Audio and
Video devices as possible
- Keep the DC side cables between the battery and the XM Series UPS as short as possible.
- Twist the DC side cables. This will partially cancel out the radiated noise from the cables
- Use co- axial shielded cable for all antenna inputs (instead of 300 ohm twin leads)
- Use high quality shielded cable to attach Audio and Video devices to one another
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General