Arrangement for the automatic representation of complex electrical network characteristics

Claim 1

APPARATUS FOR PRODUCING A DISPLAY OF THE COMPLEX CHARACTERISTICS OF AN ELECTRICAL NETWORK UPON A TWOCOORDINATE RECORDING DEVICE COMPRISING; MEANS FOR APPLYING A VARIABLE FREQUENCY VOLTAGE TO SAID NETWORK, A DIRECTIVE COUPLER RECEIVING A VOLTAGE FROM SAID NETWORK TO PRODUCE A DERIVED VOLTAGE PROPORTIONAL TO THE COMPLEX CHARACTERISTICS OF SAID NETWORK, MEANS FOR CONVERTING THE OUTPUT OF SAID DIRECTIVE COUPLER INTO FIRST AND SECOND CONSTANT FREQUENCY VOLTAGES, MEANS FOR PRODUCING A PHASE SHIFT OF 90 DEGREES IN SAID FIRST CONSTANT FREQUENCY VOLTAGE, MEANS FOR DIFFERENTIATING SAID SECOND CONSTANT FREQUENCY VOLTAGE TO PRODUCE PULSES AT THE ZERO VOLTAGE CROSS-OVER POINTS OF SAID VOLTAGE, GETTING CIRCUITRY CONTROLLED BY SAID PULSES, AND MEANS FOR APPLYING SAID PHASE DISPLAYED CONSTANT FREQUENCY VOLTAGE TO THE INPUT OF SAID GATING CIRCUITS WHEREBY SAID GATING CIRCUITS ARE OPEN AT PREDETERMINED INTERVALS TO PASS SIGNALS HAVING AMPLITUDES PROPORTIONAL TO THE COSINE AND SINE OF THE RATIO OF THE DERIVED VOLTAGE TO THE APPLIED VOLTAGE, AND MEANS FOR APPLYING SAID PROPORTIONAL SIGNALS TO SAID RECORDING APPARATUS.