Plural bridge system for simultaneously testing a plurality of interconnected circuit elements

Claim 1

AN ELECTRONIC CIRCUIT TESTING APPARATUS FOR SIMULTANEOUS TESTING OF A PLURALITY OF INTERCONNECTED CIRCUIT ELEMENTS, COMPRISING: A REFERENCE CIRCUIT HAVING A PLURALITY OF INTERCONNECTED CIRCUIT ELEMENTS; A CIRCUIT TO BE TESTED HAVING A CORRESPONDING PLURALITY OF NOMINALLY IDENTICAL INTERCONNECTED CIRCUIT ELEMENTS; A SOURCE OF CIRCUIT ENERGIZING POTENTIAL HAVING A PAIR OF OUTPUTS BALANCED WITH RESPECT TO A REFERENCE POTENTIAL AND HAVING CONNECTED THEREACROSS A PLURALITY OF PAIRS OF SAID NOMINALLY EQUAL, SERIES CONNECTED REFERENCE AND TEST ELEMENTS, THE REFERENCE ELEMENT OF EACH PAIR BEING CONNECTED WITH ONE SOURCE OUTPUT AND THE TEST ELEMENT OF EACH PAIR BEING CONNECTED WITH THE OTHER SOURCE OUTPUT, THE SENSE AND MAGNITUDE OF THE UNBALANCE POTENTIAL AT THE JUNCTION OF EACH PAIR OF REFERENCE AND TEST ELEMENTS, WITH RESPECT TO SAID REFERENCE POTENTIAL, INDICATING THE SENSE AND MAGNITUDE, RESPECTIVELY, OF A DIFFERENCE IN VALUE BETWEEN THE ASSOCIATED REFERENCE AND TEST ELEMENTS; A PLURALITY OF BIDIRECTIONAL DETECTOR MEANS, ONE FOR EACH PAIR OF REFERENCE AND TEST ELEMENTS, EACH DETECTOR MEANS BEING CONNECTED BETWEEN THE JUNCTION OF ONE OF SAID PLURALITY OF PAIRS OF ELEMENTS AND SAID REFER-