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The Shielding of Radio-Frequency Ammeters

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1 Author(s)
Wallace, J.D. ; Naval Research Laboratory, Bellevue, Anacostia, D.C.

Radio-frequency current-measuring instruments, when operated at a point in a circuit at high radio-frequency potential with respect to ground or to other near-by low-potential objects, have introduced therein another type of error, that is, one additional to other basic or inherent errors. The error introduced by high-potential operation can be materially reduced by shielding the instrument. A design of shield for an instrument is described herein which has proved highly practicable for use in measuring radio-frequency currents at high-potential points in a circuit with less error than is present in an unshielded instrument.

Published in:

Proceedings of the IRE  (Volume:29 ,  Issue: 1 )