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US 5,508,617 AGranted
Electric power measuring apparatus and method
AssigneeHewlett-Packard Company
InventorYasuaki Komatsu
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AssigneeHewlett-Packard Company
InventorYasuaki Komatsu
Estimating the term…
The current invention is directed to a method of measuring an electric power and in particular to a precise power measurement by measuring a current and a voltage of high-frequency distortion waves. The current power measuring method is based upon a summation of the power values measured for every frequency component of the distortion wave. After being frequency converted in a mixer 5, a voltage is inputted from an input terminal 1 through a voltage amplifier 3 to a vector voltmeter 7. A current is supplied into an input terminal 2, and converted into a voltage signal by a current-to-voltage converter 4. Then, the voltage signal is frequency-converted in a mixer 6, and thereafter inputted into a vector voltmeter 8. The input signals to the mixers 5 and 6 are separated into frequency components by sweeping of a local signal generator 10, which are measured by the vector voltmeters. In other words, the vector voltmeter measures effective values of the current and the voltage, and also phase difference values between the current and the voltage for every frequency component. Based on these measured values, a power value for every frequency component is calculated in a computer 9. Furthermore, a summation of power values is calculated to obtain a desirable power value.
A method of measuring an electric power by measuring a voltage and a current using a mixer and a local signal oscillator, said measuring method comprising the steps of:
A method of measuring an electric power by measuring a voltage and a current, said measuring method comprising the steps of:
A power measuring apparatus comprising:
Dependencies are inferred from the claim text.