Method of compensating for frequency errors in noise power meters
US4864218A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1988 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | Nov 9, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R29/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of measuring and compensating for measurement frequency inaccuracies encountered when measuring noise power of a device under test within a desired calibrating frequency range. The method includes sweeping a frequency synthesizer through a frequency range which includes the desired measurement frequency range. Power is measured for different synthesizer frequencies with the noise power meter set to the desired frequency range. Alternatively, the frequency synthesizer may be set to the desired measurement frequency and the noise power meter swept through a range including the desired measurement frequency. The resulting power measurements show the frequency range within which the noise power meter actually measured power. The difference between the desired measurement frequency range and the actual measurement frequency range is the measurement frequency error which may be corrected using a frequency conversion stage to displace test signals by the amount of the measurement frequency error before they are sent to the noise power meter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.