Electrical lap guide data acquisition unit and measurement scheme
US5991698A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 1997 |
| Grant date | Nov 23, 1999 |
| Priority date | — |
| Expiry date | May 7, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49037
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A lapping system data acquisition unit is disclosed for use in measuring resistances of multiple resistors embedded in a structure to be machined. Each of multiple independent current sources directs a current through one of the multiple resistors embedded in the structure during machining of a surface of the structure. Each of multiple voltage sensing devices couples to a separate one of the multiple resistors and provides a separate analog voltage output signal indicative of the resistance of the resistor. Each of multiple filters is coupled to a separate one of the multiple voltage sensing devices Analog-to-digital conversion circuitry coupled to the multiple filters generates a digitized signal for each of the filtered output signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.