Single Channel EEG Test System | User Manual
3
1
Introduction
1.1 Basic concept
WhaleTeq Single Channel EEG Test System provides a single waveform to one or
more lead electrodes of EEGs, for testing to IEC particular standards. The following
diagram shows the single channel concept:
(Figure 1) Single channel concept
Via a SEEG 100E, the system produces arbitrary waveforms (streamed from the PC
with digital to analogue conversion) at up to ±1V, which is then applied to a
precision 500:1 divider to produce the voltages at up to ±1mV level (2mVpp). The
SEEG 100E contains resistor/capacitor networks, dc offset, and relay switching to
provide the full range of single channel performance tests in IEC standard.
The basic range of tests in the standards include, for example:
-
Sensitivity (accuracy of the
μ
V/mm indication)
-
Frequency response (sine wave, and impulse tests)
-
Input impedance
-
Noise
For a full list of tests, refer to the standard together with Section 1.2.
The limitations of the system are as below:
-
Exclude input noise and CMRR tests (this requires a special noise free test
unit, available from WhaleTeq)
-
There are 22 terminals (Ch1~Ch22) in EEG breakout box. However, there are
only 9 terminals (Ch1~Ch9) could output waveforms, and the rest 13
terminals (Ch10~Ch22) are connected to ground. Please refer to section 2.2
for details.
Ch1
Ch2
Ch3
Ch4
Ch5
Ch6
Ch7
Ch8
Ch9
Ch10~Ch22
EEG device
under test
(DUT)