pun4dPUND measured values are hhly dependent on the pulse width (ms) up to the point that the pulse width exceeds 10 RC, where R is the output impedance of the tester (normally 1680 W)Applied PUND snal (a) and measured current (b), as function of time for fields below the AFE-FE transition. Global I(E) cycle (c) and I(E) cycle of only the ferroelectric switching contribution