Digital volt-ohmmeter
US3978472A · kind A · utility
14Cited by
4References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 30, 1975 |
| Grant date | Aug 31, 1976 |
| Priority date | — |
| Expiry date | Apr 30, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/0607
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A low-cost but highly accurate ohmmeter for measuring milliohm resistances is disclosed. The instrument employs a digital voltmeter (analog-to-digital converter) having an add-subtract mode which nulls any drift voltage following each measurement. A self biasing current source which eliminates common mode voltages to the high gain amplifier portion of the converter is used for resistance measurements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.