Threshold level calibration method and apparatus
US5553479A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 24, 1993 |
| Grant date | Sep 10, 1996 |
| Priority date | — |
| Expiry date | Mar 24, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F25/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A threshold calibration method and apparatus calibrates a reference voltage representing a selected threshold and compares the reference voltage with a measurement voltage representing a variable parameter to indicate the condition of the variable parameter. The reference voltage is set by causing the variable parameter to assume a predetermined high value and adjusting a first potentiometer to provide a first calibration voltage equal to the measurement voltage representing the high value. The variable parameter is then caused to assume a predetermined low value and a second potentiometer is adjusted to provide a second calibration voltage equal to the measurement voltage representing the low value. The first and second calibration voltages are then combined using passive resistive components to provide a reference voltage representing the selected threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.