Frequency and frequency error counting in test apparatus
US4345206A · kind A · utility
14Cited by
5References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 10, 1980 |
| Grant date | Aug 17, 1982 |
| Priority date | — |
| Expiry date | Jun 10, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B17/16
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Test apparatus designed to be coupled to a transmitter including a local oscillator and mixer for reducing the received carrier frequency, a frequency counter for counting the IF cycles, a subtractor for subtracting the counted value from the actual value of the desired frequency, time averaging circuitry for finding the average error in a plurality of counts and display means for displaying the average error. The frequency counter is a gate time counter which normally counts for a one-tenth second period but increases the counting time to one second when the error is reduced below .+-.10 Hertz.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.