Diagnostic range/position measuring device
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United States of America Patent
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Feb 24, 1998
Grant Date -
N/A
app pub date -
Dec 18, 1995
filing date -
Dec 21, 1994
priority date (Note) -
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Abstract
A sensor bridge circuit (20) sensitive to a proximate target (12). The bridge circuit (20) has two inductor (24, 28) and two resistors (32, 34). One inductor (24) has a reactance that varies with respect to the distance (26) of the target (12) from the inductor (24), which affects a balance of the bridge parameters of which is an indication of the distance (26). Another resistor (86) is connected in parallel to one bridge resistor (34) via an input (82) in the event where the target (12) is removed so that the displacement (26) of the sensor transfer characteristic is affected by an amount which results in a change of a diagnostic status indication (62). When the input (82) is not present, the status indication (62) should not appear in the event where the target (12) is far removed. Other resistors (42, 44) connected in parallel to bridge resistors (32, 34), via several inputs (46, 48), respectively, debalance or detune the bridge (20) so as to provide certain diagnostic information.
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