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Title: Measurement Of Femtoamp Current Using A Keithley 642 Digital Electrometer
Author: m. Owen, Shen Zhu
Source: 2005 Measurement Science Conference
Year Published: 2005
Abstract: Developing a traceable standard to measure low densities of nano to micron aerosol particles presents a challenge due to the transient nature of aerosols. One method used to quantify particle density is to measure an electric current by collecting the single-positive charged particles of a monodisperse aerosol.

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