natus Xltek EMU40EX, Руководство пользователя и обслуживания

Страница: 21 / 63

User and Service Manual EMU40EX™
21
Procedures and Warnings
Electrostatic Discharge (ESD) Handling
Before performing any setup or placement procedures, read the precautions outlined in this section.
Some semiconductor (solid state) devices can be easily damaged by static electricity. Such components are commonly called
Electrostatically Sensitive Devices (ESD). Do not touch the accessible conductive parts for the Connectors
marked with the ESD symbol.
Follow these techniques to help reduce the incidence of component damage caused by static electricity:
•
Immediately before handling any product components assemblies, drain the electrostatic charge from your body by
touching a known earth ground.
• Minimize body motions when handling unpackaged replacement ESDs. Motions such as brushing clothes together or
lifting your foot from a carpeted floor can generate enough static electricity to damage the product components.
• Avoid carpets in cool, dry areas. If provided, leave the product components in their anti-static packaging until ready to
be installed.
•
Take care when connecting or disconnecting cables. When disconnecting a cable, always pull on the cable connector
or strain-relief loop, not on the cable itself.
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, 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 culprits 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.