Method of and circuit arrangement for determining the magnitude

Details Method of and circuit arrangement for determining the magnitude Method of and circuit arrangement for determining the magnitude

1980-06-06

1982-12-07

Sloyan, T. J.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

G01R 2702

Patent

active

043629881

ABSTRACT:
In order to ascertain the magnitude R.sub.i of an unknown resistance element in digital terms, two calibrating resistances of known magnitudes R.sub.1 and R.sub.2 =mR.sub.1 (with m>1) are connected in circuit with a capacitor, to form a switchable RC network, during two gating periods whereas the unknown resistance element is inserted in their place during a third gating period. A multiplicity of counting pulses are fed during each gating period to a pulse counter delivering their count to an arithmetic unit which determines the ratio R.sub.i /R.sub.1 from the several pulse counts and from the factor m. The switchable RC network may be part of a one-shot pulse generator, establishing a variable gating period for counting pulses of a fixed cadence, or of an astable multivibrator generating different counting pulse rates during gating periods of constant duration. The fixed pulse cadence or the constant gating periods are established by another RC network which may share a common coincidence (AND, NAND or NOR) gate with the switchable network.

REFERENCES:
patent: 3316896 (1967-05-01), Thomasset
patent: 3490039 (1970-01-01), Tsao
patent: 3875501 (1975-04-01), Hayashi
patent: 4217543 (1980-08-01), Strong
Furlow, Circuit Design Idea Handbook, Cahners Books, 1974, p. 177.
Garland et al., Single-IC Capacitance Meter, Popular Electronics, 2/74, pp. 44 & 45.
Scott, 555 IC Timer Circuits, 9/76 (no further information).

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