Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1987-07-09
1989-06-13
Miller, Stanley D.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
350331T, 324 73PC, 324 73R, G02F 113, G01R 1512
Patent
active
048386642
ABSTRACT:
An overlay for an electronic circuit used as a diagnostic apparatus and a method of conducting the diagnosis using the overlay. A plurality of temperature sensitive areas which are made from encapsulated liquid crystal zones are positioned on the overlay in accordance with the spatial configuration of the electronic components with which the overlay is to be used. Each of the temperature sensitive areas is aligned with a respective component on the electronic circuit and each of the liquid crystal zones has a first color identical to the color of the rest of the crystals when the respective electronic components are within a predetermined temperature range. When the temperature of a component changes by a certain quantity, the color of the crystal zone also changes, which change is visually observed.
REFERENCES:
patent: 3889053 (1975-06-01), Lloyd et al.
patent: 4006414 (1977-02-01), Parker
patent: 4279152 (1981-07-01), Crossland
patent: 4475811 (1984-10-01), Brunner
patent: 4538105 (1985-08-01), Ausschnitt
Miller Stanley D.
Phan Trong Quang
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