Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1993-03-24
1996-09-10
Noland, Thomas P.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
73 1H, 73304C, 324679, G01D 1800, G01F 2500, G01F 2326, G01R 3500
Patent
active
055534791
ABSTRACT:
A threshold calibration method and apparatus calibrates a reference voltage representing a selected threshold and compares the reference voltage with a measurement voltage representing a variable parameter to indicate the condition of the variable parameter. The reference voltage is set by causing the variable parameter to assume a predetermined high value and adjusting a first potentiometer to provide a first calibration voltage equal to the measurement voltage representing the high value. The variable parameter is then caused to assume a predetermined low value and a second potentiometer is adjusted to provide a second calibration voltage equal to the measurement voltage representing the low value. The first and second calibration voltages are then combined using passive resistive components to provide a reference voltage representing the selected threshold.
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Flowline Inc.
Noland Thomas P.
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