Xltek EMU128 Headbox User & Service Manual
7
EMU128 Specifications (Continued)
Analog Specifications - EEG Channels
EEG Channels Up to 128 acquisition channels plus 1
reference channel
Reference Channels User Selectable: External, Common
Differential Input Impedance N/A. Inputs are not differential.
Common Mode Input Impedance 50 MOhms
Common Mode Rejection ratio > 110 dB @ 60Hz
Input Noise < 2µV pk-to-pk @ full bandwidth
EEG Channel Hardware Gain 156
Maximum AC input before clipping 20mV pk-to-pk
Maximum Operational DC input voltage
electrode offset
+/-300mV
Anti-aliasing Filter Bandwidth 131 Hz (For 500 Hz sampling freq.)
Input Bias Current < 20pA
Channel Crosstalk < -60dB
Digital Specifications
Sampling Frequency (Standard EMU128) 250 or 500 Hz, user selectable
Sampling Frequency (Advanced
EMU128FS)
250, 500, 1000, 2000 Hz, user selectable
Sampling Resolution - EEG channels
(Standard EMU128)
22 bits
Sampling Resolution - EEG channels
(EMU128FS)
16 bits
Sampling Quantisation - EEG channels 4.8nV
Storage Resolution - EEG Channels 16 bits
Storage Quantisation - EEG channels 0.31µV
Modes of Operation
Impedance Check < 2.5, < 5, < 10, < 25 kOhms
Channel Test Signal 15.625Hz, 80µV pk-to-pk
Digital Post Processing same as XLTEK EEG 32
Safety
Dielectric Strength 4 KVAC
Patient Leakage Current < 30 microamps for 550VAC applied
between system side and patient side of
the headbox. < 8 microamps for 120 VAC
normal conditions.
Headbox Mechanical
Size ~ 150 (h) x 265 (w) x 192 (d) mm
Weight ~ 2.7 Kg
General Circuit diagrams and parts lists are
available on request.
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