Signal Description

What is EEG?
An electroencephalogram (EEG) is a test to monitor the electrical activity of the brain. 
EEG Signal Levels:  1 160μVpp  EEG waveform

What is EMG?
Electromyography (EMG) is a test that measures muscle response to electrical activity within muscle fibers. 
EMG Signal Levels :  1 100 mVpp

In a typical bandwidth of 0 - 200Hz Signals are measured by detecting a potential across two commonly referenced electrodes on the scalp or skin.