Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1985-11-07
1988-02-23
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 73R, 371 20, G01R 3100
Patent
active
047273178
ABSTRACT:
Part of a printed circuit board circuit is made up of three gates (30, 31, 32) each of which are formed on a different device and interconnected by the board print so that connections (35, 36) may be established by means of probes. Associated with the inputs and outputs of each device are phantom diodes (such as diode 32) which are normally connected to circuit ground (38) but which in the case of one gate (31) are connected the supply rail (37), the device of which it forms part having been mounted in the board in the wrong orientation. By the steps of connecting one device power input pin to a test ground potential (38), raising the potential of the other power input pin via connection to a supply rail (37) and lowering the potential of an active pin (33) a diode (302) may be made to conduct current via path (304) indicating that the device (31) is wrongly orientated. The applied low potential is insufficient to bring correctly connected diodes (such as that of device 30) into conduction.
REFERENCES:
patent: 3356945 (1967-12-01), Ryan et al.
patent: 3458814 (1969-07-01), Ryan
patent: 3601698 (1971-08-01), Thurman, Jr.
Jim Healy; "In-Circuit Testing Today"; 1979 New Electronics; pp. 24-29.
"Wiregen Program"; Fair Child 1983; pp. 6.2-6.10.
Tashioglau; "Current Aspects of LSI Board Level Testing"; Electronic Engineering; Apr. 1979.
Eisenzopf Reinhard J.
Membrain Ltd.
Nguyen Vinh P.
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