Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1989-06-29
1990-09-04
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324705, G01R 2714
Patent
active
049547828
ABSTRACT:
A four terminal ohmmeter apparatus includes circuitry for blanking the meter read-out in the event one or more connections to a device or structure under test have been improperly made. The voltage drop between current terminals is determined and compared with a threshold value. The voltage drop between potential terminals or between potential and current terminals, as caused by a separate a.c. source, is also determined and compared with a standard. Individual indicators inform the operator of the validity of each connection in order that corrective action can be taken if necessary. Voltage inputs are also utilized for ascertaining whether a correct meter range is being used and for changing the range if it is improper.
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Asar et al., "Measuring Contact Contamination Automatically", Jul. 1979, The Western Electric Engineer, vol. 23, No. 3, pp. 32-38.
Eisenzopf Reinhard J.
Regan Maura K.
The Boeing Company
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