Digital frequency measuring device
US4112358A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 8, 1977 |
| Grant date | Sep 5, 1978 |
| Priority date | — |
| Expiry date | Apr 8, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04F10/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A digital frequency measuring device in which pulses of an input signal are counted for a certain period of time under the control of a gate signal and the count value is displayed in a digital form. A fraction detector circuit is provided for measuring the time interval or difference .DELTA.T.sub.1 between the leading edge of the gate signal and an input pulse arriving after it, the time interval or difference .DELTA.T.sub.2 between the trailing edge of the gate signal and an input pulse arriving after it and the unit period T of the input pulse signal, and performing an operation corresponding to (.DELTA.T.sub.1 - .DELTA.T.sub.2 /T. The result of operation is converted into the corresponding digital value, which is displayed as a fraction value of the abovesaid count value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.