The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 01, 1986
Filed:
Jan. 10, 1983
John M Morrison, Edinburgh, GB;
Ferranti plc, Cheshire, GB;
Abstract
Measurement-expressing apparatus for monitoring (n) switches, the state of each switch representing the state of a station, has a resistor in parallel with each switch, the (n) resistors having binary related resistances, a constant current is supplied to the parallel combinations of switches and resistors connected in series with each other, and signals each representative of the sum of the voltage drops within the series of parallel combinations are operated upon by an n-bit analogue-to-digital converter, the (n) outputs of the converter each being individually associated with a parallel combination, in each quantization period (t) of the converter, a signal is obtained on each converter output representative of one of the two possible states of the corresponding station, and signals of one form, provided on at least one output individually are accumulated in a counter over an interval (mt). The numbers accumulated by any counter in each of a plurality (p) of intervals (mt) are operated upon.