Hall effect device test circuit
First Claim
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1. A Hall effect device test circuit for use in a test system including a power signal source, said test circuit comprising:
- magnetic field means connected to said power signal source, operated in response to said power signal to periodically provide a magnetic field of varying intensity;
voltage reference means connected to said power source, operated in response to said power signal, to periodically provide a sample voltage of varying magnitude and proportional to the intensity of said magnetic field;
a Hall effect device connected in magnetic field proximity to said magnetic field means, operated in response to each occurrence of said magnetic field of a first predetermined intensity to provide an electrical signal of a first characteristic, and operated in response to each occurrence of said magnetic field of a second predetermined intensity to provide an electrical signal of a second characteristic;
first detection means connected to said voltage reference means and said Hall effect device, operated in response to each electrical signal of said first characteristic and an associated sample voltage of a magnitude less than a first predetermined value to provide a steady first visual indication; and
second detection means connected to said voltage reference means and said Hall effect device, operated in response to each electrical signal of said second characteristic and an associated sample voltage of a magnitude greater than a second predetermined value to provide a steady second visual indication.
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Abstract
A Hall effect device test circuit which detects Hall effect device operate and release point failures. A magnetic field circuit, a voltage switching circuit, a comparison circuit, a retriggerable monostable multivibrator circuit and a visual indicator circuit are included. The comparison circuit compares the Hall effect device switching voltage to a predetermined threshold and controls the multivibrator circuit which causes a visual pass/fail signal to be provided.
22 Citations
16 Claims
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1. A Hall effect device test circuit for use in a test system including a power signal source, said test circuit comprising:
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magnetic field means connected to said power signal source, operated in response to said power signal to periodically provide a magnetic field of varying intensity; voltage reference means connected to said power source, operated in response to said power signal, to periodically provide a sample voltage of varying magnitude and proportional to the intensity of said magnetic field; a Hall effect device connected in magnetic field proximity to said magnetic field means, operated in response to each occurrence of said magnetic field of a first predetermined intensity to provide an electrical signal of a first characteristic, and operated in response to each occurrence of said magnetic field of a second predetermined intensity to provide an electrical signal of a second characteristic; first detection means connected to said voltage reference means and said Hall effect device, operated in response to each electrical signal of said first characteristic and an associated sample voltage of a magnitude less than a first predetermined value to provide a steady first visual indication; and second detection means connected to said voltage reference means and said Hall effect device, operated in response to each electrical signal of said second characteristic and an associated sample voltage of a magnitude greater than a second predetermined value to provide a steady second visual indication. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification