Non-contact voltage probe apparatus
First Claim
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1. A non-contact voltage probe apparatus comprising:
- a cylindrical inner electrode;
a coaxial cylindrical outer electrode coaxially provided outside said cylindrical inner electrode so as to surround said cylindrical inner electrode;
a cable fixing member disposed inside said cylindrical inner electrode, said cable fixing member for allowing a cable to be measured to penetrate therein and holding the cable therein;
means for detecting voltage having a high input impedance and a ground, said voltage detecting means being attached to said coaxial cylindrical outer electrode, and said voltage detecting means being electrically connected to said cylindrical inner electrode, thereby reducing a measurement error caused by parastitic elements in a high frequency range;
means for connecting said coaxial cylindrical outer electrode to the ground of said voltage detecting means; and
a material having a low dielectric constant disposed between said cylindrical inner electrode and said coaxial cylindrical outer electrode.
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Abstract
A non-contact voltage probe is used to measure the voltage of electromagnetic interference developed in a cable or the like electrically connected to pieces of electronic equipment. The non-contact voltage probe has double coaxial cylindrical-type inner and outer electrodes through which a cable or the like is passed. The inner electrode is electrically connected to a voltage detector, which measures the voltage induced by the capacitance between the inner electrode and the cable passing there through, and the outer electrode is grounded.
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Citations
6 Claims
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1. A non-contact voltage probe apparatus comprising:
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a cylindrical inner electrode; a coaxial cylindrical outer electrode coaxially provided outside said cylindrical inner electrode so as to surround said cylindrical inner electrode; a cable fixing member disposed inside said cylindrical inner electrode, said cable fixing member for allowing a cable to be measured to penetrate therein and holding the cable therein; means for detecting voltage having a high input impedance and a ground, said voltage detecting means being attached to said coaxial cylindrical outer electrode, and said voltage detecting means being electrically connected to said cylindrical inner electrode, thereby reducing a measurement error caused by parastitic elements in a high frequency range; means for connecting said coaxial cylindrical outer electrode to the ground of said voltage detecting means; and a material having a low dielectric constant disposed between said cylindrical inner electrode and said coaxial cylindrical outer electrode. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification