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Low-level measurements of DC voltages using a SQUID

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>1976
<mark>Journal</mark>Journal of Physics E: Scientific Instruments
Issue number10
Number of pages3
Pages (from-to)807-809
Publication StatusPublished
<mark>Original language</mark>English


The input circuitry of a SQUID voltmeter system has been modified by using a shorted signal coil which acts as a low-pass filter with a cut-off frequency of less than 1 Hz. This enables the SQUID to be used under adverse noise conditions in order to measure voltages generated in an unscreened sample. The incorporation of a superconducting switch is also described which enables sample voltages to be isolated without changes in the applied conditions. The frequency response of the low-pass filter is measured in the magnetometer mode.