Returns the physical dimension of signal edfsignal ("uV", "BPM", "mA", "Degr.", etc.).
phy_dim=edf_get_physical_dim(path, edfsignal)
: string containing the path and name of the file
: Minimum value is 1.
: physical dimension of signal edfsignal
Returns the physical dimension of signal edfsignal ("uV", "BPM", "mA", "Degr.", etc.).