Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage

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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

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• G01R 23/04 adapted for measuring in circuits having distributed constants
• G01R 23/06 by converting frequency into an amplitude of current or voltage
• G01R 23/10 by converting frequency into a train of pulses, which are then counted
• G01R 23/12 by converting frequency into phase shift
• G01R 23/14 by heterodyning; by beat-frequency comparison
• G01R 23/15 Indicating that frequency of pulses is either above or below a predetermined value or within or outside a predetermined range of values, by making use of non-linear or digital elements