Abstract
A high-impedance voltage measuring system is described. The system is intended for long-term, high-resolution, high-accuracy measurements from high-impedance sources or sources which are easily polarized. For input voltages of 1-V magnitude, the overall accuracy is better than 0.1 mV and the resolution is 30 μV (noise limited). The input impedance is above 2×1014 Ω and the input bias current is 14 fA. A flexible scanning channel selector allows measurements from up to eight signal sources in parallel, a low-cost calculator provides on-line analytical processing of measurement data, and a dynamic variable zero suppression unit makes long-term recording of signal variations down to the resolution level possible.
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