Service manual

Revision 2/18/05 2 - 17
System Overview
Stimulators
The VikingQuest Base Unit’s mother board produces
the electrical current stimulus and visual stimulus (using
LED goggles). An Auditory Stimulator daughter board
produces the auditory stimulus.
Stimulus timing control of rates, durations, train pulse
count and interval, and electrical stimulus level are all
handled in the electronic hardware under software
control. In addition, two external trigger outputs along
with a trigger input are available for the control and
monitoring of externally generated stimuli.
Electrical Stimulating System
The electrical stimulus generator resides on the
VikingQuest Base Unit’s mother board. One output
connector on the base unit’s rear panel connects directly
to an SM402 Stimulus Probe. A second connector is
provided for the Electrical Stimulator 2 Option.
Control Panel
The XP-based VikingQuest features a simplified
Control Panel integrated onto the base unit. The Control
Panel provides controls to set individual stimulus
intensity levels for two stimulation sites and Mute
switch for the EMG speaker. The Control Panel
connects to the base unit via a dedicated serial link.
Auditory Stimulator
The VikingQuest base unit contains an Auditory
Stimulator board that provides direct outputs to a
transducer. Possible transducers are shielded and
unshielded THD-39 headphones and TIP 300 Tubal
Inserts.
Visual Stimulators
A rear panel connector provides the link for the LED
Goggles stimulator A separate Trigger Out connector
controls stimulus delivery for the VIASYS 2015 Pattern
Reversal Visual Stimulator.
VikingQuest Electrical Stimulator 2 Option
VikingQuest Control Panel