Physical quantities electric transducers temperature compensation circuit
US4196382A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 16, 1978 |
| Grant date | Apr 1, 1980 |
| Priority date | — |
| Expiry date | Feb 16, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L1/2281
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A physical quantities transducer compensation circuit is provided with at least two compensating bridge circuits. The first of these circuits consists of resistors and a first potentiometer and thermistors where the control element, preferably a second potentiometer is connected via the diagonal of this bridge supplied by the voltage drop across a resistor connected in series into the current circuit of a strain gauge. The current circuit of the second strain gauge includes a zeroing circuit consisting of resistors and a third potentiometer. The second compensating bridge is built of resistors and thermistators, and a fourth potentiometer is connected over the diagonal of the bridge. This bridge is supplied with the differential voltage of a Zener diode having a resistor and a diode supplied with the bridge current. The current source is located on the transistors and the resistor being controlled by voltage between the slide of a fourth potentiometer and the common point, to which diode and resistor are connected. Supply current sources of the strain gauges and the output signal is taken from slides of a second and third potentiometers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.