Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural ranges – scales or registration rates
Patent
1979-03-22
1980-10-28
Moore, David K.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural ranges, scales or registration rates
324140R, 324167, G01R 1508
Patent
active
042309840
ABSTRACT:
An air core gage having a pair of coils in quadrature to drive a pointer has the first coil energized by a relatively constant reference current while the second coil is energized by a current which varies as a tangent function of the input quantity in order to drive the pointer through an octant of the gage. The current polarity to the second coil is reversed and the current is again varied in the same manner to vary the pointer through a second octant. Then, the reference current is applied to the second coil and the current is varied in the first coil according to the tangent function to drive the pointer through a third octant, and so on for a wide angle pointer drive. When the input quantity is a frequency, the driving circuit is conveniently a digital circuit including a ROM which stores the tangent function of the input quantity and a steering logic circuit which selectively applies the steady state and the variable signals to the gage coils to effect the appropriate pointer movement.
REFERENCES:
patent: 3329893 (1967-07-01), Lawless et al.
patent: 3624625 (1971-11-01), Stonestreet
patent: 3636447 (1972-01-01), Gelenius
patent: 3946311 (1976-03-01), Baker et al.
patent: 4051434 (1977-09-01), Sweet
patent: 4070665 (1978-01-01), Glennon et al.
General Motors Corporation
Hill Warren D.
Moore David K.
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