Patent ID: 8862426

Claim:
A computer-performed method for characterizing device parameter variation in an array of devices, the method comprising: under control of a computer system, sequentially selecting devices within said array as a selected device under test; producing a voltage or current waveform at a test output of the array of devices corresponding to a value of a particular device parameter of the selected device, wherein the voltage or current waveform is generated at the test output by action of the sequentially selecting; measuring at least one of a DC value or a root mean square value of a variation of the voltage or current waveform during the sequentially selecting with a digital meter interfaced to the computer system; and storing the at least one of the DC value or the root mean square value of the variation of the voltage or current waveform in a memory of the computer system as an indication of a statistic of the device parameter variation; wherein the measuring measures a root mean square value of variation of the waveform as an indication of a standard deviation of the device parameter variation.