Calibration of a plurality of excitation sources for an instrume

Details Calibration of a plurality of excitation sources for an instrume Calibration of a plurality of excitation sources for an instrume

1995-06-02

1997-07-15

Trammell, James P.

Boots, shoes, and leggings

364483, 307 43, G01C 2500

Patent

active

056489188

ABSTRACT:
A calibration system for calibrating a plurality of excitation sources of an instrumentation system. The calibration system allows a single calibration adjustment for calibrating all of the excitation sources simultaneously rather than having to independently adjust each excitation source. An adjustable Zener diode coupled to a potentiometer forms an adjustable calibration circuit providing a reference voltage to a plurality of current excitation sources. Each current source preferably includes a buffer and transistor control circuit receiving the reference voltage for controlling current through a precision resistor. In this manner, only the precision resistor is duplicated for each channel, where the calibration adjust mechanism is provided in a single circuit for all channels. This significantly reduces circuitry and cost while also simplifying the calibration procedure to a single adjustment.

REFERENCES:
patent: 4322790 (1982-03-01), Wolfinger
patent: 4532434 (1985-07-01), Layton
patent: 4646299 (1987-02-01), Schinabech et al.
The Art of Electronics, Second Edition, Paul Horowitz, Harvard University, Winfield Hill, Rowland Institute for Science, Cambridge University Press, 1989, p. 252.
Intuitive Operational Amplifiers From Basics to Useful Applications, Revised Edition, Thomas M. Frederiksen, McGraw-Hill Book Company, 1988, pp. 206-208.

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