by converting frequency into an amplitude of current or voltage

Full Title

Arrangements for measuring frequencies; Arrangements for analysing frequency spectra > Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage > by converting frequency into an amplitude of current or voltage

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• G01R 23/07 using response of circuits tuned on resonance, e.g. grid-drip meter
• G01R 23/08 using response of circuits tuned off resonance
• G01R 23/09 using analogue integrators, e.g. capacitors establishing a mean value by balance of input signals and defined discharge signals or leakage