Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1993-03-17
1994-01-25
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324661, 73708, G01R 2726
Patent
active
052819221
ABSTRACT:
A two wire transmitter responsive to a pressure differential sensor includes a fixed module and a removable module. The fixed module is adapted for connection to an analog removable module having a compensation capacitance M.sub.A C.sub.DA or a digital removable module having compensation capacitance C.sub.DD. Capacitance compensation circuitry is included in the fixed module which includes a compensation capacitance C.sub.DM which is selected whereby M.sub.A C.sub.DA equals C.sub.DD when the analog removable module and the digital removable module are calibrated. This provides a pressure transfer function which is more linearized and less susceptible to temperature variations.
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Lofgren Lyle E.
Schulte John P.
Seemann Brian
Brown Glenn W.
Rosemount Inc.
Wieder Kenneth A.
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