User & Service Manual
Trex™ HD Monitoring Amplifier
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4.2. Conducted Immunity Procedures and Warnings
Conducted immunity is defined as the ability of an electronic product to tolerate the influence of electrical
energy from other electronic products or electromagnetic phenomena.
The electrical energy from other electronic devices located in nearby equipment are usually propagated
through the connecting cables. The functionality of some Semiconductor devices and high sensitivity
amplifiers (EEG, EMG ECG) may be affected by induced parasitic signals.
This effect could be described as noise and/or channel saturation on the EEG waveforms, which are
coupled together with off the scale values for auxiliary sensors.
Follow these techniques to help identify the sources, and to increase the
immunity towards parasitical noise:
•
Verify the power supply and all portable multiple socket-outlets are off the floor and in a dry
location.
•
If parasitic noise is present on the EEG waveforms, try to identify possible sources of noise by
disconnecting nearby equipment from the common power source.
•
Lay out the interconnection cables as far as possible from the cables being used by nearby
equipment.
•
Verify the power cord integrity. Do not use portable multiple socket outlets that are not properly
grounded.
•
Do not use power outlets without a protective ground.
•
When isolation transformers are used, ensure that the Medical System is properly grounded.