DIFF Subgroup
G01R 23/06 by converting frequency into an amplitude of current or voltage
Introduced: September 1968
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
IPC and CPC are identically structured here. All 3 subcodes exist in both systems.
Child Classifications
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- G01R 23/07 using response of circuits tuned on resonance, e.g. grid-drip meter since 1974 IPC+CPC Available in IPC and CPC
- G01R 23/09 using analogue integrators, e.g. capacitors establishing a mean value by balance of input signals and defined discharge signals or leakage since 1974 IPC+CPC Available in IPC and CPC