Electricity: measuring and testing – Internal-combustion engine ignition system or device – With analysis of displayed waveform
Patent
1994-03-16
1996-04-16
Wieder, Kenneth A.
Electricity: measuring and testing
Internal-combustion engine ignition system or device
With analysis of displayed waveform
324141, 324107, G01R 1132
Patent
active
055086179
ABSTRACT:
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.
REFERENCES:
patent: 4775834 (1988-10-01), Lahti
patent: 4920312 (1990-04-01), Maruyama
patent: 5262715 (1993-11-01), King et al.
Yokogawa, Yokogawa Technical Report, Electric Co., Ltd., May 1992, No. 14, pp. 29-33.
Bowser Barry C.
Hewlett--Packard Company
Wieder Kenneth A.
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