Apparatus for measuring the rate of a watch
US4083222A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 28, 1977 |
| Grant date | Apr 11, 1978 |
| Priority date | — |
| Expiry date | Jan 28, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/153
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for measuring the rate of a watch is disclosed including a sensing device for the signals produced by a watch to be checked, a selecting and pulse shaping circuit, and comparator means for comparing the repetition frequency of the measuring pulses with the frequency of standard pulses. The selecting and pulse shaping circuit is designed to constitute a monostable multivibrator the period of which is automatically adapted to the period of the signal to be measured. The selecting circuit is unsensitive to secondary and disturbing noise signals during a very high percentage of the time interval corresponding to the period to be measured and allows the checking of watches having frequencies between about 1 Hz and 32 kHz.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.