Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2006-05-02
2006-05-02
Nguyen, Vincent Q. (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C073S317000
Reexamination Certificate
active
07038473
ABSTRACT:
A fluid level (26) is measured through determining an inclination angle of a bracket (32) that rotatably connects a floating member (34) located near a surface of the fluid to a pivoting arrangement (28, 30) which carries a resistor (40) of which a first part is branched off through a slider (42) moving along with a change in the angle. In particular, the following steps are executed. First, connecting a stabilized power supply (U0) with its first terminal in series with a limiting resistor (RV) to one end of the resistor (40); second, measuring the voltages over both the first part (UF) and over a remainder part (UE) of the resistor. Finally, calculating the resistance value of the first part (RX) through eliminating a contact resistance value (RU,46) associated with the slider from the measurement equations given by the values of the respective voltages (UF, UE).
REFERENCES:
patent: 4803420 (1989-02-01), Steinbrecher et al.
patent: 4911011 (1990-03-01), Fekete et al.
patent: 4931764 (1990-06-01), Gaston
patent: 5666851 (1997-09-01), Bacon
patent: 6389892 (2002-05-01), Sato et al.
patent: 42 16 467 (1993-12-01), None
Mayer Brown Rowe & Maw LLP
Siemens Aktiengesellschaft
Speer Richard A.
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