Calibration signal

For those interested,

"The calibration signal is a 14Hz 250uVp-p squarewave, so your signal
is correct. Your Y-axis unit for an eeg signal should be in
microvolts. A typical eeg signal is within 20uVp-p range. (can
actually vary from 0 - 100 uV according to the literature)."

A quote from one of the senior members of openEEG forum