Abstract
An instrument for the purpose of monitoring the stability of dc voltage sources, has been constructed and tested. The instrument is an operational invertor, which uses a vibrating reed electrometer and capacitors as input and feedback elements. This arrangement yields an output voltage signal which is an amplified version of the input voltage change, with the dc level subtracted out. The main advantages consist of the elimination of the usual resistance divider and reference voltage problems, as well as the imposition of negligible steady-state loading on the source. Useful time intervals depend upon the magnitudes of the observed voltage fluctuations and range from a few minutes to a few days. The system has been tested in the voltage range up to 1 kV, and holds promise for applications to 10 kV or higher. Changes in the voltage source as small as 1 part in 10 7 can be displayed easily and with a minimum of ambiguity.
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