Neuro-Audio (Technical Manual)
38
Annex 1. Main Specifications
The main specifications of the system are given in Table 4.
Table 4. Main specifications
Parameter
Value
EP channels
Number of channels
2
Input voltage range
20 µV to 50 mV
The admissible error of voltage measurement should be
within
·
in the voltage range from 20 to 100 µV;
·
in the voltage range from 0.1
до
50 mV.
± 15 %
± 5 %
Voltage range of the obtained averaged evoked
potentials
0.1 to 400 µV
The admissible relative error of EP voltage
measurement in the range from 1 to 400 µV at not less
than 2000 averagings
± 10 %
Sampling rate
200 Hz – 80 kHz (1-2 channels),
160 kHz (1 channel)
Input impedance
not less than 90 M
Ω
Input noise in 2–10000 Hz range (RMS)
not more than 0.5 µV
High pass filter
0.01–5000 Hz
Low pass filter
10–10000 Hz
On/off notch filter 50 or 60 Hz (switchable)
not less than 40 dB
Common-mode rejection
not less than 100 dB
Gain
21-20832
Auditory stimulator
Number of auditory channels
2
Bone vibrator calibration
B-71 (mastoid placement)
Bone vibrator headband static force
5.4N ±0.5N
TDH-39 headband static force
4.5N ±0.5N
Stimulation level (maximal for click)
100 dB nHL (TDH-39, ER-3C),
50 dB nHL (Bone vibrator)
Stimulation level (maximal for tone burst at 1 kHz)
110 dB nHL (TDH-39), 100 dB nHL
(ER-3C), 60 dB nHL (Bone vibrator)
The sound pressure level at pure tone generation via
the headphones:
·
at tone frequency within 125 – 4000 Hz range
·
at tone frequency within 4 – 8 kHz range
with ±3.0 dB accuracy
with ±5.0 dB accuracy
Stimulation level (minimal for pure tone)
-10 dB HL (or less)
Stimulus repetition rate
0.1–100 Hz with the admissible
relative deviation of ± 0.1 %