Single Channel EEG Test System | User Manual
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2.3 Environment, noise reduction
A noise free environment is necessary for testing EEG equipment. This can be achieved
relatively easily by (a) using a metal bench or metal sheet underneath the EEG device
under test and the WhaleTeq SEEG test unit, and (b) connecting SEEG GND terminal to the
sheet and also the frame ground (or EP terminal) of the EEG device under test:
With this set up, turn the EEG device under test to maximum sensitivity, turn off the ac
filters (if possible) and confirm that the level of noise is acceptable for tests. For most tests,
this set up is satisfactory without any special efforts. However, for the input impedance
test with the 620kΩ is in seri
es the imbalance in impedance can cause high noise. For this
test, the ac filter may be turned on. If the noise is still excessive, move to an electrically
quiet environment or increase the size of the metal sheet underneath and around the set
up.
EEG Device
Under test
Frame ground
or EP terminal
Metal bench, metal sheet or foil