Method and apparatus for calibrating a transducer having real an

Details Method and apparatus for calibrating a transducer having real an Method and apparatus for calibrating a transducer having real an

1985-07-05

1988-12-13

Noland, Tom

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

73 1C, G01D 1800, G01L 2500

Patent

active

047901756

ABSTRACT:
Method and apparatus for calibrating a transducer having real and reactive impedance, which is excited from an excitation source and which provides an output signal connected by an electrical conductor to a remote load. A preamplifier is provided having a high impedance input and a low impedance output connected to the electrical conductor, and calibration structure is provided for alternatively connecting the transducer output to the preamplifier input for preamplifying the transducer output signal and providing to the remote load a low impedance preamplified output signal or providing a substantially purely resistive calibration signal to the preamplifier input for use in calibrating the transducer. In one embodiment, a remote auxiliary calibration circuit is provided including circuitry for selectively calibrating the auxiliary calibration circuit. In one embodiment, a power supply is provided for powering the preamplifier to provide further improved accuracy and convenience.

REFERENCES:
patent: 2602839 (1952-07-01), Ellis
patent: 3203223 (1965-08-01), Petrow
patent: 3209248 (1965-09-01), Seifert
patent: 3463934 (1969-08-01), Nobis

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