Circuit arrangement for converting a bridge unbalance into a fre

Details Circuit arrangement for converting a bridge unbalance into a fre Circuit arrangement for converting a bridge unbalance into a fre

1975-07-08

1977-02-01

Grimm, Siegfried H.

Oscillators

With device responsive to external physical condition

324 65R, 324DIG1, 331135, 331138, G01R 2702, H03B 520

Patent

active

040064301

ABSTRACT:
The bridge unbalance of a measuring bridge including a measuring transducer is converted into a frequency variation of an RC-oscillator. Since measuring transducers often have characteristics which are not exactly linear, such a conversion, which exactly compensates for said non-linearity, would be effective. For this purpose, correction voltages are derived from the voltages supplied by the oscillator by means of differentiation circuits and integration circuits, which voltages are proportional to the positive respectively the negative powers of the frequency. The differentiation circuits and integration circuits respectively are supplied with oscillator voltages such that at their outputs voltages of the correct phase are obtained. The voltages from the differentiation circuits and integration circuits are added via summing resistors and are superimposed on the compensation voltage of the oscillator.

REFERENCES:
patent: 3536997 (1970-10-01), Holt
patent: 3845385 (1974-10-01), Ebrecht

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