Electric current measurement apparatus, voltage measurement apparatus and power supply apparatus

A voltage measurement apparatus for measuring a voltage vale supplied on a desired electrode of an electro tube, comprising:

• a transformer having a primary winding of input side and a secondary winding of output side;
• a voltage dividing resistor connected in parallel with target voltage measurement points for dividing a measurement target voltage by using at least two resistors;
• a voltage detection unit which detects a divided voltage of the measurement target voltage and outputs pulse signals having pulse attribute corresponding to a detected value of the divided voltage;
• a switching part connected between two wirings of the secondary winding of the transformer for providing a short circuit of the secondary winding according to the pulse signals outputted from the voltage detection unit;
• and
• a measurement voltage value output unit which measures pulse attribute of pulse-shape electric currents being induced on the primary winding of the transformer caused by intermittent short circuit of the secondary winding provided by the switching part, and outputs a value of the measurement target voltage based on a measurement result of the pulse attribute of the pulse-shape electric currents with referring to a predetermined relationship among a voltage dividing ratio of the voltage dividing resistor, a voltage value of the divided voltage and the pulse attribute of the pulse signals generated in the voltage detection unit.

A power supply apparatus for supplying electric power to respective electrodes of an electron tube, comprising:

• a plurality of direct-current voltage supply sources, each of the direct-current voltage supply sources supplies a predetermined value of voltage on respective electrodes of the electron tube;
• and
• an electric current measurement apparatus for measuring an electric current value flowing to a desired electrode of the electron tube including,
• a detection resistor connected in series in an ampere meter route of a desired electrode through which a measurement target electric current flows;
• a voltage detection unit which detects electric potential difference at the detection resistor and outputs pulse signals having pulse attribute corresponding to a detected value of the electric potential difference;
• a switching part connected between two wirings of a secondary winding of a transformer of one of the direct-current voltage supply sources for providing a short circuit of the secondary winding according to the pulse signals outputted from the voltage detection unit;
• and
• a measurement current value output unit which measures pulse attribute of pulse-shape electric currents being induced on a primary winding of the transformer caused by intermittent short circuit of the secondary winding provided by the switching part, and outputs a value of the measurement target electric current flowing through the detection resistor based on a measurement result of the pulse attribute of the pulse-shape electric currents with referring to a predetermined relationship between a value of the electric current flowing through the detection resistor and the pulse attribute of the pulse signals generated in the voltage detection unit,
• wherein operating power of the voltage detection unit is supplied by one of the direct-current voltage supply sources.

A method of an electric current measurement for measuring an electric current value flowing to a desired electrode of an electron tube, comprising:

• providing a transformer having a primary winding of input side and a secondary winding of output side;
• providing a detection resistor connected in series in an ampere meter route of the desired electrode through which a measurement target electric current flows;
• detecting electric potential difference between both ends of the detection resistor and outputting pulse signals having pulse attribute corresponding to a detected value of the electric potential difference;
• providing a short circuit of the secondary winding of the transformer for intermittently connecting the short circuit according to the outputted pulse signals;
• measuring pulse attribute of pulse-shape electric currents being induced on the primary winding of the transformer caused by intermittent connection of the short circuit of the secondary winding;
• and
• outputting a value of the measurement target electric current flowing through the detection resistor based on a measurement result of the pulse attribute of the pulse-shape electric currents by a calculation with referring to a predetermined relationship between a value of the electric current flowing through the detection resistor and the pulse attribute of the outputted pulse signals.

A method of a voltage measurement for measuring a voltage vale supplied on a desired electrode of an electro tube, comprising:

• providing a transformer having a primary winding of input side and a secondary winding of output side;
• providing a voltage dividing resistor connected in parallel with target voltage measurement points for dividing a measurement target voltage by using at least two resistors;
• detecting a divided voltage of the measurement target voltage and outputting pulse signals having pulse attribute corresponding to a detected value of the divided voltage;
• providing a short circuit of the secondary winding of the transformer for intermittently connecting the short circuit according to the outputted pulse signals;
• measuring pulse attribute of pulse-shape electric currents being induced on the primary winding of the transformer caused by intermittent connection of the short circuit of the secondary winding;
• and
• outputting a value of the measurement target voltage based on a measurement result of the pulse attribute of the pulse-shape electric currents by a calculation with referring to a predetermined relationship among a voltage dividing ratio of the voltage dividing resistor, a voltage value of the divided voltage and the pulse attribute of the outputted pulse signals.