Service manual

Revision 2/18/05 2 - 21
System Overview
Patient Signal Path
The patient signal path include all the components that
are involved in collecting and processing the patient
signals. The following components are part of the
patient signal path.
• EA-2 EMG Amplifier
• EA-4 EMG Amplifier
• ES-8 EP Amplifier
• ET-16A(B) Headbox and cable
• FireWire Isobox (or FireBrick) power supply
• FireWire Interface card
• FireWire cables connecting these components.
FireWire Amplifiers
There are three amplifiers available for the VikingSelect
system. They are the EA-2, the EA-4 and the ES-8. All
amplifiers contain the amplification stage, the signal
conditioning, and the analog-to-digital blocks. The ES-8
amplifier also contains input select switches and has a
headbox to interface with the patient electrodes. The
EA-2 and EA-4 have electrode jacks built into the
amplifier to interface with the patient electrodes.
All these amplifiers use a FireWire interface to transfer
digital patient data to the computer system.
EA-2 EMG Amplifier
ES-8 EP Amplifier
EA-4 EMG Amplifier