Impedance measurement in 4-wire to 2-wire converters
US4602338A · kind A · utility
29Cited by
5References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 1, 1983 |
| Grant date | Jul 22, 1986 |
| Priority date | — |
| Expiry date | Sep 1, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/30
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An oscillating input signal is applied to the 4-wire input terminals which is monitored while the 4-wire output terminals and the 2-wire terminals are also monitored. This procedure is performed with a first known reference impedance connected across the 2-wire terminals and then repeated with a second reference impedance similarly connected. A plurality of input frequencies may be applied over the range of 400 Hz to 4000 Hz.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.