Multimode electrometer for atmospheric ion measurements
- 30 November 2000
- journal article
- letter
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 71 (12) , 4683-4685
- https://doi.org/10.1063/1.1327303
Abstract
A computer-controlled electrometer capable of either high impedance voltage measurements or femtoampere current measurements has been developed. It is intended for use with a Gerdien ion counter in atmospheric temperatures. Temperature variations can cause significant thermal errors arising from offset voltage and bias current changes that compromise the measurements. Use of high impedance switching permits the offset voltage and input bias currents of the electrometer to be measured, and allows regular software compensations to be applied in both modes.Keywords
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