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Electromagnetic Compatibility
174 Appendix B Safety and Environment
Avoiding
Interference
When electromagnetic interference (EMI) is encountered there are a number of things that
can be done to mitigate the problem.
1. Eliminate the source. Possible sources of EMI can be turned off or moved away to
reduce their strength.
2. Attenuate the coupling. If the coupling path is through the patient cables the
interference may be reduced by moving and/or rearranging the cables to a different
location of the monitor. If the coupling path is through the power cord, plugging the
monitor into a different mains circuit may help.
3. Connect the equipotential terminal of the monitor to the corresponding terminal of
your mains installation.
4. Add external attenuators. If EMI becomes an unusually difficult problem, external
devices such as an isolation transformer or a transient suppressor may help. A Philips
customer engineer can assist you in determining the need for external devices.