Boots – shoes – and leggings
Patent
1986-07-18
1988-03-29
Krass, Errol A.
Boots, shoes, and leggings
324130, 73 1R, G01C 2500, G01C 1738, G01R 102
Patent
active
047348739
ABSTRACT:
A method of digital process variable transmitter calibration includes the steps of sensing the process variable (PV) to produce an analog output which is converted to a digital signal representation. The digital signal is corrected by a microprocessor using a characterization equation previously individually developed during a manufacturing testing of the process variable transmitter over a predetermined range of environmental stimuli to ascrtain the coefficients for a polynomial in the form of PV=A.sub.o =A.sub.1 P+A.sub.2 +. . . A.sub.i P.sup.i. Thus, the digital computer produces a process variable representation as a modified digital output. Subsequently, the digital output from the computer is converted to a conventional 4-20 mA analog signal for use as a process control signal. The process variable transmitter apparatus utilizing the aforesaid method includes means for receiving an output from a process variable sensor, an analog-to-digital converter for converting the received output from the sensor to a digital representation, a digital computer, a non-volatile memory for storing an individualized correction equation determined during the manufacturing testing of the transmitter and a digital-to-analog converter for converting the computer output to an analog control signal.
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Malloy, deceased John R.
Olsen Arthur M.
Dixon Joseph L.
Halista Mitchell J.
Honeywell Inc.
Krass Errol A.
Medved Albin
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