System for comparing conditions between selected pairs of termin

Details System for comparing conditions between selected pairs of termin System for comparing conditions between selected pairs of termin

1985-05-29

1986-08-05

Karlsen, Ernest F.

Electricity: measuring and testing

Plural, automatically sequential tests

324 73AT, G01R 1512

Patent

active

046045708

ABSTRACT:
A ballistic comparative ohmmeter for use in testing the resistance between different selected pairs of a plurality of terminals in a test circuit in comparison to the resistance between corresponding pairs of terminals in a reference circuit. the ohmmeter is particularly useful for making resistance tests in circuits included in assembled products. The ohmmeter makes comparative resistance tests during a transient response period following application of the current to the selected pair of terminals as well as under steady state conditions. Solid state stepping switches that are sequentially stepped by pulse counters are utilized to sequentially connect different combinations of terminals in the test circuit and the reference circuit. Protection circuits limit the voltages applied across the test circuit and master circuit terminals. Indicator panels immediately provide a steady state indication of the pair of terminals in the test circuit at which a fault is detected.

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