Electricity: measuring and testing – Plural – automatically sequential tests
Patent
1984-04-06
1987-01-13
Karlsen, Ernest F.
Electricity: measuring and testing
Plural, automatically sequential tests
324158R, G01R 1512, G01R 3122
Patent
active
046367160
ABSTRACT:
For the purpose of testing units which contain electrical circuits, an interpretation circuit and a load circuit are connected to the output of the unit being tested by way of a line. A load circuit is provided which contains two constant current sources which are respectively variable in terms of current value and which are respectively connectible and disconnectible. The one constant current source therefore serves as a load current source and the three serves as a load current sink. A determination can be made, with the assistance of a variable control voltage, as to whether the load circuit operates as a current source or a current sink. The constant current source and the variable control voltage are connected to one another and to the line to the unit being tested by way of a diode bridge. A comparator circuit is connected to the same line and comprises an impedance and voltage level converter and two comparators. Separately variable reference voltages are supplied to the comparators. Three voltage ranges are thereby formed for the evaluation of the output signal of the unit being tested. The samping time of the evaluation is defined by sampling signals. The interpretation circuit and the load circuit are programmable within broad current and voltage ranges so that they can be employed to test units which belong to different circuit technologies.
REFERENCES:
patent: 4495462 (1985-01-01), Weldon
patent: 4523312 (1985-06-01), Takeuchi
Newsom; "Implementation of I/O Contact Testing on NLT Logic Testers", 1979, IBM Technical Disclosure Bulletin, vol. 22, No. 4, Sep. 1979, p. 1344.
Karlsen Ernest F.
Nguyen Vinh Phu
Siemens Aktiengesellschaft
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