Device for electrically checking printed circuit boards
AssigneeSiemens Aktiengesellschaft
InventorsGuenter Doemens, Manfred Glieden
Life of this patent
Estimating the term…
Abstract
An apparatus for electrical function checking of wiring matrices includes a carrier plate having a plurality of gas discharge channels therein is put in place on a wiring matrix to be checked and selected test locations of the wiring matrix are ionically contacted through the gas discharge channels. Each gas discharge channel is equipped with at least two electrodes and is selectable in accordance with the coincidence principle by electrode bus bars that are preferably arranged in the form of rows so that a matrix addressing of selected test locations can be undertaken.
Claims20
An apparatus for electrical function checking of
- wiring matrices, comprising:
- a carrier plate for emplacement onto individual ones of said wiring matrices in succession;
- a plurality of gas discharge channels in said carrier plate;
- at least two electrodes provided in each of said gas discharge channels;
- and
- a plurality of electrode bus bars connecting said electrodes for selection of ones of said gas discharge channels in accordance with the coincidence principle,
- so that at least two respective selected test locations of the wiring matrix are ionically contactable by selected ones of said gas discharge channels and respective ones of said electrodes.
A function checking device for electrical testing of test locations on printed circuit boards, comprising:
- a carrier plate of insulating material for placement over individual ones of said pointed circuit boards in succession;
- a plurality of gas discharge channels in the form of blind holes extending into a first side of said carrier plate, at least some of said gas discharge channels for placement in registration with the test locations;
- first and second electrodes disposed within each of said plurality of gas discharge channels adjacent a blind end of said gas discharge channels;
- a plurality of first electrode bus bars connecting said first electrodes in rows;
- first voltage supply means connectable to selected ones of said first electrode bus bars for supplying an ignition voltage to said selected bus bars;
- a plurality of second electrode bus bars connecting said second electrodes in rows;
- second voltage supply means connectable to selected ones of said second electrode bus bars for supplying an ignition voltage to said selected bus bars, an ignition voltage present simultaneously on said first and second electrodes in a single gas discharge channel being conducive for an ignition of a gas discharge between one of said first and second electrodes and a corresponding test location, the existence of and character of the gas discharge being indicative of the electrical characteristics of the test location and the circuit board.
Dependencies are inferred from the claim text.