Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With electromagnetic field
Patent
1985-08-09
1987-12-01
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With electromagnetic field
324 74, 324130, 324151R, G01R 3504, G01R 120
Patent
active
047107065
ABSTRACT:
The electrical measuring meter comprises a polarized motor magnet mounted for movement to and from a starting position, a polarized holding magnet operative magnetically to influence the motor magnet constantly towards such starting position, and a calibrating element magnetized by the holding magnet to effect a partial cancellation of the holding magnet's influence on the motor magnet as is needed for calibration. The calibrating element preferably is in the form of a soft iron circular disc, and soft iron discs of different sizes are used to calibrate the meter for respective different maximum scale current values. Also, the high magnetic permeability of the soft iron disc enables the use of a rugged and economical sleeve bearing mount for the motor magnet even in a meter calibrated for low current measurement.
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Eisenzopf Reinhard J.
Harvey Jack B.
Prime Instruments, Inc.
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