Heater-cathode insulation leakage test method and apparatus
阅读：839发布：2021-09-04
专利汇可以提供Heater-cathode insulation leakage test method and apparatus专利检索，专利查询，专利分析的服务。并且A high voltage, short duration pulse is applied between the heater and cathode of an electron tube to cause an electrical breakdown of dielectric material disposed between the heater and cathode when the dielectric material is defective. After the high voltage pulse, a second voltage having a value less than the peak value of the high voltage pulse is applied between the heater and cathode to provide a sustaining current through the dielectric material when, and only when, a dielectric breakdown has occurred. Current measuring means are disposed between the lower voltage source and either the heater or cathode of the tube to measure the leakage current, if any, that is present during the application of the lower sustaining voltage.，下面是Heater-cathode insulation leakage test method and apparatus专利的具体信息内容。
1. A method for testing an electron tube for insulation current leakage between a first electrode and a second electrode spaced from said first electrode by a dielectric material disposed therebetween, comprising: impressing a first voltage across said dielectric material between said electrodes in a time interval having a given duration, said first voltage having a given peak value resulting in a first currEnt flowing through said dielectric material in said time interval only when said dielectric material is defective, reducing the level of said first voltage to produce a second voltage having a value less than said given peak value, said second voltage value tending to cause a second current to flow through said dielectric material only when said first current flows, and monitoring the magnitude of said second current flowing through said dielectric material between said electrodes produced by said second voltage.
2. The method of claim 1 wherein said impressing step includes the step of superimposing a voltage pulse on said second voltage.
3. A method for testing an electron tube for insulation current leakage between a first electrode and a second electrode spaced from said first electrode by a dielectric material disposed therebetween comprising: impressing a voltage pulse occurring in a time interval having a given duration across said electrodes, said voltage pulse having a peak value resulting in a first current flowing through said dielectric in said time interval only when said dielectric is defective, impressing a voltage across said electrodes contiguous with and subsequent to said voltage pulse, said voltages having a value less than said peak value, said voltage value resulting in a second current flowing through said dielectric between said electrodes, only when said first current flows, and monitoring said second current flowing through said dielectric material.
4. An apparatus for testing an electron tube for insulation leakage between first and second spaced electrodes including a dielectric material disposed between said electrodes, comprising: a pair of output terminals each being capable of being connected to a different one of said electrodes, voltage generating means coupled to said terminals for impressing a first voltage across said dielectric material between said electrodes in a time interval having a given duration when said terminals are connected to said electrodes, said first voltage having a given peak value resulting in a first current flowing through said dielectric material in said time interval only when said dielectric material is defective, voltage reducing means coupled to said terminals for reducing the level of said first voltage to produce a second voltage having a value less than said given peak value, said second voltage value tending to cause a second current to flow through said dielectric material only when said first current flows, and current monitoring means coupled between said voltage reducing means and one of said electrodes for monitoring said second current flowing through said dielectric material between said electrodes.
5. An apparatus for testing an electron tube for insulation current leakage between a first electrode and a second electrode spaced from said first electrode by a dielectric material disposed therebeween, comprising: a pair of output terminals each being capable of being coupled to a different one of said electrodes, pulse generating means coupled to said terminals for impressing across said dielectric material when said terminals are connected to said electrodes a voltage pulse occurring in a time interval having a given duration, said voltage pulse having a peak value resulting in a first current flowing through said dielectric in said time interval only when said dielectric is defective, voltage generating means coupled to said terminals for impressing a voltage across said dielectric material contiguous with and subsequent to said voltage pulse when said terminals are connected to said electrodes, said voltage having a value less than said peak value, said voltage value resulting in a second current flowing through said dielectric between said electrodes only when said first current flows, and leakage current monitoring means coupled between one of said terminals and said voltage generating means for monitoring said second cuRrent.
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