D.E.V.I.C.E. is an encyclopedia of terms used by manufacturers of test and measurement equipment. T&M Atlantic created this service to better explain the functionality of instruments it offers, and to highlight the latest developments in the world of measurement equipment. We are using such tools as animation to bring words and pictures to life and to create not just an understanding but also an appreciation for technology that goes into the design of every instrument.
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Picoamperemeter is a device to measure very small currents in nanoamperes (nA), picoampere (pA) and, in some cases, femtoamperes (fA). Such currents are needed to measure isolation resistance, for example gate dielectric of MIS transistors, their leakage currents and off-state currents. Modern digital picoamperemeters are designed in accordance with a measuring circuit based on integrated operating amplifier with a parallel feedback. It allows getting minimal input resistance which is advisable for current measurement.