Precision a. c. phase sensor

Claim 1

APPARATUS FOR THE MEASUREMENT OF THE PHASE RELATIONSHIP OF A NOMINAL 60 HERTZ VOLTAGE BEING TESTED AND A NOMINAL 60 HERTZ REFERENCE VOLTAGE, THE SAID APPARATUS COMPRISING: (A) A FIRST PULSE GENERATOR MEANS INCLUDING A 400 HERTZ TRANSFROMER HAVING A PRIMARY AND A SECONDARY WINDING; A FIRST DIODE CONNECTED IN SERIES WITH THE SAID 400 HERTZ TRANSFORMER PRIMARY WINDING; MEANS FOR CONNECTING THE SAID PRIMARY WINDING AND SERIES CONNECTED DIODE ACROSS THE SAID REFERENCE VOLTAGE; A SILICON CONTROLLED RECTIFIER HAVING AN ANODE, A CATHODE, AND A CONTROL ELECTRODE; A SECOND DIODE; A MANUALLY VARIABLE RESISTIVE VOLTAGE DIVIDER MEANS; MEANS FOR CONNECTING IN SERIES RELATIONSHIP THE SAID 400 HERTZ TRANSFORMER SECONDARY WINDING, THE SAID SECOND DIODE, AND THE SAID MANUALLY VARIABLE RESISTIVE VOLTAGE DIVIDER MEANS; CONNECTING MEANS COOPERATING WITH THE SAID MANUALLY VARIABLE VOLTAGE DIVIDER MEANS AND THE SAID CONTROL ELECTRODE AND CATHODE OF THE SILICON CONTROLLED RECTIFIER PROVIDING A MANUALLY ADJUSTABLE CONTROL VOLTAGE BETWEEN THE CONTROL ELECTRODE AND THE CATHODE OF THE SAID SILICON CONTROLLED RECTIFIER; A 60 HERTZ TRANSFORMER HAVING A PRIMARY WINDING AND A SECONDARY WINDING AN INDUCTIVE-CAPACITIVE PARALLEL RESONANT CIRCUIT; MEANS FOR CONNECTING THE SAID RESONANT CIRCUIT, THE SAID SECONDARY WINDING OF THE 60 HERTZ TRANSFORMER, AND THE ANODE AND CATHODE OF THE SILICON CONTROLLED RECTIFIER IN SERIES RELATIONSHIP; ZENER DIODE MEANS CONNECTED IN PARALLEL WITH THE SAID PARALLEL RESONANT CIRCUIT TO PROVIDE A FLAT-TOPPED PULSE; A SERIES-PARALLEL NETWORK COMPRISING A THIRD DIODE CONNECTED IN SERIES WITH A PARALLEL CONNECTED FOURTH DIODE AND RESISTANCE FOR PROVIDING A UNIDIRECTIONAL PULSE; CONNECTING MEANS FOR CONNECTING THE SAID SERIES PARALLEL NETWORK IN PARALLEL WITH THE SAID ZENER DIODE MEANS; CONNECTING MEANS COOPERATING WITH THE SAID PARALLEL CONNECTED DIODE AND RESISTANCE FOR PROVIDING A REFERENCE OUTPUT PULSE WHEREBY THE SAID REFERENCE OUTPUT PULSE WHEREBY THE SAID REFERENCE OUTPUT PULSE HAS A MANUALLY VARIABLE DETERMINED PHASE DELAY WITH RESPECST TO THE SAID REFERENCE VOLTAGE;