Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1991-01-25
1992-10-20
Nguyen, Vinh
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 731, 371 226, 371 212, 365201, 340653, G01R 3102, G01R 3128
Patent
active
051573288
ABSTRACT:
There are disclosed a system for and a method of detecting a reverse packaging of a PROM capable of judging the packaging state of PROM having different impedances by adding an impedance switching circuit to the conventional socket. The method includes the steps of turning off the switch in the impedance switching circuit so that the socket receives a first voltage supplied from one of the impedances, storing the first voltage received by the socket, turning on the switch in the impedance switching circuit so that the socket receives a second voltage supplied from another impedance, storing the second voltage received by the socket, and judging that the PROM is normally packaged in the socket in case that the first voltage is equal to the second voltage and the PROM is reversely packaged in the socket in case that the first voltage is not equal to the second voltage.
REFERENCES:
patent: 3356945 (1967-12-01), Ryan et al.
patent: 3676767 (1972-07-01), Boelter
patent: 4245331 (1981-01-01), Hamano et al.
patent: 4727317 (1988-02-01), Oliver
patent: 4864219 (1989-09-01), Parsons
Ando Electric Co. Ltd.
Nguyen Vinh
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