HALL EFFECT SENSOR SYSTEM WITH DIAGNOSTIC CAPABILITIES
First Claim
1. A method for verifying measurements obtained from a hall effect sensor in a hall effect sensor system, the method comprising:
- exciting the hall effect sensor with an excitation current having a first value;
obtaining a first measurement corresponding to a voltage output of the hall effect sensor when the hall effect sensor is excited with the excitation current having the first value;
exciting the hall effect sensor with the excitation current having a second value, the second value different than the first value;
obtaining a second measurement corresponding to a voltage output of the hall effect sensor when the hall effect sensor is excited with the excitation current having the second value;
verifying operation of the hall effect sensor based at least on the first measurement and the second measurement.
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Abstract
In a method for verifying measurements obtained from a hall effect sensor in a hall effect sensor system, the hall effect sensor is excited with an excitation current having a first value. A first measurement corresponding to a voltage output of the hall effect sensor when the hall effect sensor is excited with the excitation current having the first value is obtained. Additionally, the hall effect sensor is excited with the excitation current having a second value, the second value different than the first value. A second measurement corresponding to a voltage output of the hall effect sensor when the hall effect sensor is excited with the excitation current having the second value is obtained. Operation of the hall effect sensor is then verified based at least on the first measurement and the second measurement.
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Citations
20 Claims
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1. A method for verifying measurements obtained from a hall effect sensor in a hall effect sensor system, the method comprising:
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exciting the hall effect sensor with an excitation current having a first value; obtaining a first measurement corresponding to a voltage output of the hall effect sensor when the hall effect sensor is excited with the excitation current having the first value; exciting the hall effect sensor with the excitation current having a second value, the second value different than the first value; obtaining a second measurement corresponding to a voltage output of the hall effect sensor when the hall effect sensor is excited with the excitation current having the second value; verifying operation of the hall effect sensor based at least on the first measurement and the second measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A hall effect sensor system for use in a field device operating in a process control system, comprising
a hall effect sensor; -
a current driver coupled to the hall effect sensor and configured to supply excitation current to the hall effect sensor; and a microcontroller coupled to the current driver, the microcontroller configured to; control the current driver to supply excitation current having a first value to the hall effect sensor; obtain a first measurement corresponding to a voltage output of the hall effect sensor when the hall effect sensor is excited with the excitation current having the first value; control the current driver to supply excitation current having a second value to the hall effect sensor, the second value different than the first value; obtain a second measurement corresponding to a voltage output of the hall effect sensor when the hall effect sensor is excited with the excitation current having the second value; verify operation of the hall effect sensor based at least on the first measurement and the second measurement. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A process control system, comprising:
a field device comprising a hall effect sensor system configured to measure a process variable in the processes control system, wherein the hall effect sensor system includes a hall effect sensor, a current driver coupled to an excitation input of hall effect sensor; and a microcontroller coupled to the current driver, the microcontroller configured to; control the current driver to supply excitation current having a first value to the hall effect sensor; obtain a first measurement corresponding to a voltage output of the hall effect sensor when the hall effect sensor is excited with the excitation current having the first value; control the current driver to supply excitation current having a second value to the hall effect sensor, the second value different than the first value; obtain a second measurement corresponding to a voltage output of the hall effect sensor when the hall effect sensor is excited with the excitation current having the second value; verify operation of the hall effect sensor based at least on the first measurement and the second measurement. - View Dependent Claims (20)
Specification