Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural active motor elements
Patent
1993-07-30
1995-09-05
O'Shea, Sandra L.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural active motor elements
324166, 324167, G01R 1136
Patent
active
054481635
ABSTRACT:
There is disclosed a meter driving device which can perform a smooth indication through a simple process in response to an input pulse even if the frequency of the input pulse is relatively low.
An edge detector generates a one-shot pulse each time the edge of an input pulse is detected by the edge detector. CPU performs a digital filtering process to the one-shot pulse in response to a start signal having a constant update cycle that is provided from a timer. Thus, the high-frequency components are removed from the one-shot pulse so that a DC component is taken out to provide an angular shift .theta. of an indicating arm corresponding to the frequency of the input pulse. This DC component is used to move the indicating arm through a indicator drive device.
REFERENCES:
patent: 4988944 (1991-01-01), Ito
patent: 5017861 (1991-05-01), Hukuda
patent: 5051688 (1991-09-01), Murase et al.
patent: 5218291 (1993-06-01), Murase
patent: 5313155 (1994-05-01), Yamamoto et al.
patent: 5315536 (1994-05-01), Murase et al.
patent: 5357196 (1994-10-01), Ito
O'Shea Sandra L.
Phillips Roger
Rohm & Co., Ltd.
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