Hall generator wattmeter having square-wave superimposed on hall plate output to compensate for power factor

Claim 1

AN ELECTRONIC ALTERNATING CURRENT POWER METERING SYSTEM, COMPRISING A HALL GENERATOR HAVING TWO INPUT CIRCUITS FOR RESPECTIVE CURRENT AND VOLTAGE INPUT MAGNITUDES OF THE ALTERNATING CURRENT TO BE METERED AND HAVING A MAGNETIC FIELD COIL IN ONE OF SAID INPUT CIRCUITS AND A FILED-EXPOSED HALL PLATE IN THE OTHER OF SAID INPUT CIRCUITS AND A HALL-PLATE OUTPUT CIRCUIT, RECTIFIER MEANS CONNECTED IN ONE OF SAID INPUT CIRCUITS TO PROVIDE ONE OF SAID INPUT MAGNITUDES IN RECTIFIED CONDITION AS A RECTIFIED INPUT MAGNITUDE, AND INTEGRATING REACTOR CONNECTED TO SAID OUTPUT CIRCUIT, INDICATING MEANS CONNECTED TO SAID REACTOR FOR OPERATION IN ACCORDANCE WITH THE ACTIVE POWER FACTOR OF THE ALTERNATING CURRENT, AND COMPENSATING MEANS FOR COMPENSATING INTEGRATING ERRORS DUE TO DEPARTURE OF THE POWER FACTOR OF THE ALTERNATING CURRENT TO BE METERED FROM UNITY VALUE, SAID COMPENSATING MEANS COMPRISING A VOLTAGE SOURCE OF ADJUSTABLE SQUARE WAVE VOLTAGE AND CIRCUIT MEANS CONNECTING SAID SOURCE WITH SAID VOLTAGE HALLPLATE OUTPUT CIRCUIT FOR SUPERIMPOSING THE SQUARE WAVE VOLTAGE OF SAID VOLTAGE SOURCE UPON SAID OUTPUT CIRCUIT IN PHASE WITH THE OTHER OF SAID INPUT MAGNITUDES.