Digital EEG
AHNS EEG headbox 29 / 40 channels
Channel configuration and
full scale input range
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29 channels
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40 channels
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EEG/EXG
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25 referential
1 bipolar
2 unipolar
1 SpO2
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33 referential
3 bipolar
3 unipolar
1 SpO2
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Referential & bipolar inputs (except ECG)
ECG (bipolar)
Unipolar
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5.050 mV / 21.21 mV / 166.7 mV
(software selectable)
ECG input: 166.7 mV
47.6 mV
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Analog to Digital
conversion
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Range
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1 Vpp
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Resolution
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20-bits
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Acquisition rates
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125, 200, 250, 500, 1k, 2k, 5k, 10k, 20k, 40k samples/s/channel
(software selectable)
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Input impedance
50 MΩ per input (-> 100 MΩ per channel)
Noise (referred to
input)
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Referential inputs
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<2 µVpp
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Bipolar inputs
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<10 µVpp
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CMRR
≥100 dB at 50/60 Hz
Filters
HW
High Pass Filters
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AC Coupling
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HP = 0.0713 Hz (first order, 6 dB/oct)
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LP = 23.8 kHz (first order, 6 dB/oct)
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DSP High Pass Filters
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Software selectable
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Off or 0.07 Hz
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(first order, 6 dB/oct)
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DSP Low Pass Filters
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User selectable
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~ at 1/3 of software selected
sampling frequency
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2 x 2nd order butterworth type,
2 x 12 dB/oct
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DSP Notch Filter
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Software selectable
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50 or 60 Hz 1st order
butterworth type,
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quality factor = 2.5
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Neurophysiology
Mini-headbox
Photo stimulator
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