System for measuring signal levels

Details System for measuring signal levels System for measuring signal levels

1980-07-11

1982-04-13

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Balancing

324111, 324132, G01R 1706, G01R 1510

Patent

active

043250246

ABSTRACT:
An incoming a-c signal, whose amplitude is to be measured, successively passes through several decadic attenuator stages settable by respective cascaded decadic stages of a reversible counter. The attenuated signal is rectified and its voltage, or the RMS value thereof obtained from a squarer, gives rise to a calibration current, opposed by a constant reference current, for charging a capacitor of a current/frequency converter with a resulting current corresponding to their difference. Two threshold detectors in that converter, responding to a capacitor charge of either polarity beyond a predetermined limit, trigger a monoflop which fully or partly discharges the capacitor and steps the counter forward or backward as determined by a polarity sensor connected across the capacitor. A retriggerable second monoflop, responsive to the trailing edge of each stepping pulse, enables the second-lowest counter stage to be stepped out of turn when these pulses follow one another at high rate. The readings of the counter stages are also fed to a digital/analog converter working into a decibel meter.

REFERENCES:
patent: 3159787 (1964-12-01), Sexton et al.
patent: 3584295 (1971-06-01), Bayer et al.

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