Stimulus Duration
Click
: 0.05 - 1.0ms
Pip Rise/Fall
: 1-255 cycles in 1 cycle steps
Pip Plateau
: 1-999 cycles in 1 cycle steps
Tone Rise/Fall
: 1-255ms in 1ms steps
Tone Plateau
: 1-999ms in 1ms steps
Pip and Tone
: 125Hz, 250Hz, 500Hz, 750Hz,
frequencies
1kHz, 1.5kHz, 2kHz, 3kHz,
4kHz, 6kHz, and 8kHz
Headphones
: Telephonics TDH-49 type BF
The EP Stimulator board is able to save calibration
settings for up to four different transducers.
A microphone input is available to talk to the
patient through the headphones in auditory tests.
2.6 Visual Stimulator
The visual stimulator operates in conjunction with
one of the following types of external monitor :–
¨
VGA
¨
SVGA
¨
50Hz/625 line TV standard
¨
60Hz/525 line TV standard
¨
100Hz
A variety of test presentations are provided as
follows.
Pattern
: Checkerboard, horizontal or
vertical bars, horizontal or
vertical sinusoidal gratings
Stimulus Presentation
: Reversal or Onset/Offset.
Fields
: Full field, half field, quarter
field, peripheral and foveal
Pattern Size
: 8, 16, 32, 64 & 128 pattern
elements
Fixation
: Electronic Fixation Point with
range of sizes
Contrast
: 20, 40, 60, 100%
Frame rate
: 50Hz or 60Hz switchable with
software
The visual stimulator can also be connected
directly to a Flash Stimulator, and via and to LED
Goggles, EOG Stimulator, or Ganzfeld Stimulator.
2.7 PC Tower
Processor
: 200 or 233MMX Pentium
Level 2 cache
: 512kbytes
Memory
: 32MByte EDO RAM
expandable to 192MByte
Disk Controllers : Floppy Disk Drive
Primary and secondary IDE
Ports
: 2 Enhanced serial
1 Enhanced parallel
PC Graphics
: Trio S3 64 bit video controller
1280 x 1024
2.8 DSP Card
Loughborough Sound Images (LSI) PCI/C44-
n
M
DSP designed specifically for
Oxford Instruments
.
(Where
n
= the number of DSP’s fitted to the
board)
Card type
: Standard length PCI
Interface
: Full PCI master/slave
Processor type
: TMS320C44 (60MHz). Up to
three can be installed,
dependent on system
configuration
Memory
: 128k x 32 local SRAM/proc.
128k x 32 global SRAM/proc.
128k x 32 shared SRAM
2.9 Graphics Card (Option)
Card type
: Matrox Millennium
Resolution
: Up 1600 x 1200
Colours
: 64K
Memory
: 4MByte
2.10 Display (Options)
17" or 21" Multi-sync colour SVGA monitor.
NOTE: Only the 17" monitor is suitable for
mounting on the trolley arm. The 21" monitor is
too heavy to be mounted on the arm.
2.11
Network Card (Option)
Network card (3 COM type) currently supplied.
TECHNICAL SPECIFICATION
Issue A May 1998
Synergy Mobile Workshop Manual
Chapter 2 Page 3