Thermocouple type r. m. s. measuring system having storage means to hold measured signal for comparison with reference

Claim 1

IN A VOLTAGE COMPARISON SYSTEM, THE COMBINATION OF, A PAIR OF INPUT TERMINALS TO BE CONNECTED TO SOURCES OF VOLTAGE TO BE COMPARED, A THERMOCOUPLE INCLUDING HEATER MEANS AND OUTPUT MEANS, A FIRST AMPLIFIER INCLUDING INPUT MEANS AND OUTPUT MEANS, A SECOND AMPLIFIER INCLUDING INPUT MEANS AND OUTPUT MEANS OF INVERTED POLARITY WITH RESPECT TO SAID INPUT, A THIRD AMPLIFIER INCLUDING A TWO SIDED DIFFERENTIAL INPUT MEANS AND OUTPUT MEANS, CURRENT CONTROL MEANS CONNECTED TO SAID HEATER, A TWO POSITION SWITCH FOR SWITCHING SAID CURRENT CONTROL MEANS SELECTIVELY TO EACH OF SAID INPUT TERMINALS TO SELECTIVELY APPLY SAID SOURCE OF VOLTAGE THROUGH SAID CURRENT CONTROL MEANS TO SAID HEATER, MEANS CONNECTING SAID THERMOCOUPLE OUTPUT MEANS TO THE INPUT OF SAID FIRST AMPLIFIER, A SWITCH WHICH WHEN CLOSED CONNECTS THE OUTPUT OF SAID FIRST AMPLIFIER TO THE INPUT OF SAID SECOND AMPLIFIER, A CAPACITOR TO BE CHARGED BY SIGNALS AMPLIFIED BY SAID SECOND AMPLIFIER CONNECTED TO ITS OUTPUT, MECHANICAL COUPLING MEANS BETWEEN SAID TWO SWITCHES TO PROVIDE CLOSING OF SAID SECOND SWITCH CORRESPONDING WITH A PREDETERMINED POSITION OF SAID FIRST SWITCH SO THAT SAID CAPACITOR IS CHARGED IN RESPONSE TO ONE OF SAID SOURCES OF VOLTAGE, MEANS CONNECTING ONE SIDE OF SAID THIRD AMPLIFIER INPUT MEANS TO THE OUTPUT OF SAID FIRST AMPLIFIER AND THE OTHER SIDE TO SAID CAPACITOR SO THAT THE OUTPUT OF SAID THIRD AMPLIFIER IS A FUNCTION OF THE DIFFERENCE BETWEEN SAID TWO SOURCES OF VOLTAGE.