Timed drift compensation for rate volume monitor
US4765342A · kind A · utility
7Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1987 |
| Grant date | Aug 23, 1988 |
| Priority date | — |
| Expiry date | Jul 27, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/087
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A drift compensating circuit cooperates with an air-pressure-to voltage transducer. The first input of a comparison circuit is connected to the transducer, while a reference voltage is connected to the second input. The reference voltage is provided by an up/down counter and a digital to analog converter. The comparison circuit has an output connected to the up/down counter to cause the counter to count up or down. The counter is enabled at predetermined intervals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.