Circuit and arrangement for 3-wire measurements with input protection
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United States of America Patent
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Jul 17, 2018
Grant Date -
Apr 13, 2017
app pub date -
Jun 7, 2016
filing date -
Oct 9, 2015
priority date (Note) -
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Abstract
A method and a circuit take a measurement of a sensor having first, second and third lead wires by: (a) providing first, second and third terminals for voltage measurements; (b) connecting a current sensing device (e.g., a reference resistor) to provide a signal at the third terminal that is indicative of the current in the third lead wire of the sensor; (c) connecting a first protective device between the first lead wire of the sensor and the first terminal; (d) connecting a second protective device between the second lead wire of the sensor and the second terminal; (e) connecting a first current source to the first lead wire of the sensor; (f) connecting a second current source to the second lead wire of the sensor; and (g) measuring a first voltage across the first and second terminals and a second voltage across the third terminal and the voltage reference.
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