Digital meter using calculator components

Details Digital meter using calculator components Digital meter using calculator components

1981-09-21

1985-01-08

Karlsen, Ernest F.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 62, 324157, 364705, G06F 305, G01R 1152, G01R 2726

Patent

active

044929161

ABSTRACT:
The invention uses an RC circuit 12 to convert an analog quantity to be measured into a time interval proportional to the measured quantity by using a resistive element in the RC circuit responsive to the quantity being measured. The RC circuit starts and stops a time base generator 13 to produce pulses having a total number proportional to the time interval, and a gate system 14 applies the pulses to the key terminals of the circuitry 16 of a pocket calculator 10 for indicating the pulse count on a display 15, either directly or after being processed by functions available in the calculator circuitry. The RC circuit can also be used to start and stop a time base generator 33 built into a digital stopwatch for displaying a pulse count proportional to the quantity measured. The measured quantity can be a capacitance value, a resistance value, or energy impinging on a responsive transducer in the RC circuit.

REFERENCES:
patent: 4370727 (1983-01-01), Bellet

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