The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 22, 1983
Filed:
Dec. 22, 1980
David A McNamara, Ypsilanti, MI (US);
Ford Motor Company, Dearborn, MI (US);
Abstract
The specification teaches a method for calibrating a transducer for converting pressure variation to a frequency variation of a periodic electrical signal. The transducer includes a reference signal source and a sensor signal source which are combined in a mixer. The method includes the steps of applying a first reference pressure to the transducer and measuring the first sensor signal frequency and applying a second reference pressure to the transducer and measuring a second sensor frequency. The reference signal frequency is measured during at least one of the applications of the first or second reference pressure. An actual, uncalibrated transfer function is calculated defining the mixer output signal frequency as a function of pressure. The slope of the actual transfer function is altered to a desired, calibrated slope by changing the magnitude of a resistor in the sensor signal source. The frequency axis intercept is altered to a desired, calibrated frequency intercept by changing the magnitude of a resistor in the reference signal source. The method permits calibration of the transducer to a desired transfer function thereby making possible identical transfer functions for a plurality of mass produced units.