Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1975-08-27
1977-05-24
Krawczewicz, Stanley T.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
73362AR, 323 75H, 323 75N, 324DIG1, G01R 2702
Patent
active
040258475
ABSTRACT:
In a measurement system having a sensor the electrical resistance R.sub.s of which varies as a function of a parameter being measured, and a bridge circuit having the sensor and a long transmission wire in a first arm connected to a first control node, a second long transmission wire in a second arm connected to a second control node, and third and fourth arms respectively connected to the first and second nodes, the wires having equal resistances R.sub.c, the wires being connected to the sensor and being arranged so that any resistance-changing conditions affect both wires equally during operation of the system, that improvement wherein the third bridge arm is connected between the first control node and a first current injection node, the fourth bridge arm is connected between the second control node and a second current injection node, a reference voltage source is provided, first active control circuitry is connected to receive inputs from the first and second control nodes and from the voltage source, and to provide to the first injection node a current controlled so as to maintain the control nodes at a predetermined voltage difference related to the voltage at the source, second active control circuitry is connected to the bridge to provide to the second injection node a current controlled so as to maintain the injection nodes at a voltage difference related to the predetermined difference, and output circuitry is connected to the bridge to provide an output related to one of the controlled currents.
REFERENCES:
patent: 3273396 (1966-09-01), Beck
patent: 3287978 (1966-11-01), Knudsen
patent: 3531990 (1970-10-01), Shinskey
patent: 3688581 (1972-09-01), Le Quernec
Krawczewicz Stanley T.
The Sippican Corporation
LandOfFree
Measurement system including bridge circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Measurement system including bridge circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measurement system including bridge circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-539730