Oxford Medelec Synergy Mobile, Workshop Manual, Page: 10 / 69

2.1.9 Temperature Probe
Temperature Range 15
°
C to 40
°
C with 0.1
°
C
resolution, 0.2
°
C accuracy for use with YSI series
400 or 4400 probes with resistance of 2253
Ω
at
25
°
C. Reusable and Disposable types available
(see chapter 10 )
Note: Disposable types cannot be connected
directly an extention/adaptor cable is required.
2.2 A to D Conversion
Resolution
16 bits at all sampling rates.
2 Channel Headbox Sampling Rate
2 channels : 20µs/sample 50kHz
5 Channel Headbox Sampling Rates
1–3 channels : 20µs/sample 50kHz
4 and 5 channels 50µs/sample 20kHz
10 Channel Headbox Sampling Rates
1–3 channels : 20µs/sample 50kHz
4-10 channels : 50µs/sample 20kHz
2.3 Data Storage
Hard Disk
Interface : Enhanced IDE
Disk Size : 2.5GByte formatted
For storing the Windows 95 operating system
software and the Synergy Mobile applications
software and EMG test routines. Also used for
storing trace data, patient data etc.
Floppy Diskette
Physical size : 3½" disk drive
Data capacity : 2MByte unformatted
1.44MByte unformatted
For installing the Windows 95 operating system
software (floppy version), the Synergy Mobile
applications software, and any upgrades.
CD-ROM
Interface : Enhanced IDE
Speed : 24 speed drive
For installing the Windows 95 operating system
software (CD-ROM version) and applications
software. The CD-ROM cannot be written to.
2.4 Electrical Stimulator
One or two stimulators.
Constant voltage/constant current with low or high
range.
Voltage Output : High Range - 0 to 300V
Low Range - 0 to 75V
Current Output : High Range - 0 to 100mA
Low Range - 0 to 25mA
Repetition Rates : Fine adjustment available up
to 200pps. (Up to 500pps in
a train for pain studies).
Stim Duration : 0.05, 0.1, 0.2, 0.5, 1.0ms
Ranges in between those shown are software
selectable.
At a repetition rate of 200pps and an intensity of
300V/100mA, the maximum stimulus duration is
0.2ms. At a repetition rate of 100pps and an
intensity of 300V/100mA, the maximum stimulus
duration is 0.5ms.
Delay : ±
0
to 9 screen divisions
Output Impedance : <100
Ω
for voltage stimulus
>100k
Ω
for current stimulus
Stimulus modes : Single, refractory, collision,
double, train, bi-phasic
Stim fail is reported for electrode impedance too
high in current mode or too low in voltage mode.
2.5 Auditory Stimulator
The auditory stimulus can be administered via
various transducers e.g. audiometric headphones,
bone conductor and intra-auricular headset which
should be isolated to type BF classification.
Modes : Clicks, pips and tone bursts
Stimulus
presentation
: Right, left or binaural.
Polarity : Positive, negative or
alternating.
Masking : Contralateral, ipsilateral, and
bilateral white noise and
narrow band masking; +10 to
–40dB and OFF referred to
stimulus intensity.
Click Intensity : 0 to 110dBHL (122dBSPL
max. output) in 5dB
increments
Pip and Tone : 0 to 120 dBnHL
Intensity (132dBSPL max. Output)
in 5dB increments
Envelopes : Linear, Hanning, Gaussian,
Blackman
Compensation : SPL, nHL, and subjective
hearing compensation
Chapter 2 Page 2 Synergy Mobile Workshop Manual
Draft March 1998 TECHNICAL SPECIFICATION