Cross-coil type measuring instrument with correction means for v

Details Cross-coil type measuring instrument with correction means for v Cross-coil type measuring instrument with correction means for v

1992-10-23

1995-01-17

Snow, Walter E.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural active motor elements

324 7639, G01R 1136, G01P 348

Patent

active

053828976

ABSTRACT:
A cross-coil type measuring instrument which is employed as an engine tachometer for instance. A cross-coil type measuring instrument includes a cross-coil type measuring unit having a pair of coils arranged crossed forming a predetermined angle with each other, and a movable magnet magnetized bi-polar which is set rotatable by the magnetic action of said pair of coils, a driving circuit for producing polarized drive signals which are different from each other in phase and change in response to variation in values to be measured, and a constant voltage source for supplying a first constant voltage to the driving unit, the first constant voltage being switched to a second constant voltage periodically in response to a switching signal. Due to the switching of the constant voltage, the amount of power supplied to the cross coils can be made smaller resulting in reducing the amount of heat generated therein as much.

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