Apparatus for measuring the negative ratio of voltage

Claim 1

APPARATUS FOR MEASURING NEGATIVE VOLTAGE DIVIDING RATIO AND NEGATIVE VOLTAGE INCREASE RATIO COMPRISING A BRIDGE CIRCUIT HAVING FOUR ARMS, A PAIR OF INPUT TERMINALS, AND A PAIR OF OUTPUT TERMINALS. TWO SOURCES OF POTENTIAL CONNECTED IN SERIES ADDING RELATIONSHIP ACROSS SAID INPUT TERMINALS, MEANS CONNECTING THE POINT OF CONNECTION BETWEEN SAID TWO POTENTIAL SOURCES TO ONE OF SAID OUTPUT TERMINALS, SAID FIRST ARM INCLUDING A CIRCUIT UNDER TEST HAVING AN OUTPUT TERMINAL WHICH PRODUCES A NEGATIVE VOLTAGE DIVIDING RATIO OR NEGATIVE VOLTAGE INCREASE RATIO, SAID SECOND ARM COMPRISING A VARIABLE DIVIDER RESISTOR AND BEING CONNECTED IN SERIES WITH THE FIRST ARM BETWEEN SAID INPUT TERMINALS, SAID THIRD ARM COMPRISING A PROPORTIONAL ARM RESISTOR, SAID FOURTH ARM COMPRISING A STANDARD VARIABLE DIVIDER RESISTOR AND BEING CONNECTED IN SERIES WITH SAID THIRD ARM BETWEEN ONE OF SAID OUTPUT TERMINALS AND THE VARIABLE CONTACT ON SAID VARIABLE DIVIDER RESISTOR, A CURRENT INDICATING MEANS, MEANS FOR CONNECTING SAID CURRENT INDICATING MEANS BETWEEN SAID OUTPUT TERMINALS WHEREBY SAID BRIDGE IS BALANCED BY FIRST ADJUSTING SAID VARIABLE DIVIDER RESISTOR, AND MEANS FOR THEN CONNECTING SAID CURRENT INDICATING MEANS BETWEEN SAID OUTPUT TERMINAL OF SAID CIRCUIT UNDER TEST, AND WHEREBY THE VARIABLE CONTACT ON SAID STANDARD VARIABLE DIVIDER RESISTOR, NEGATIVE DIVIDING RATIO OR NEGATIVE INCREASE RATIO CAN BE ACCURATELY DETERMINED FROM THE SETTING OF SAID STANDARD VARIABLE DIVIDER RESISTOR WHEN SAID LATTER RESISTOR IS ADJUSTED UNTIL SAID CURRENT INDICATING MEANS INDICATES ZERO CURRENT.