Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1994-06-17
1996-07-02
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324223, 324225, 324241, 324649, 324713, 324720, G01R 2700, G01R 3312, G01R 3314
Patent
active
055325904
ABSTRACT:
A measuring circuit obtains desired characteristic values of a device under test by accurately measuring a voltage and a current. Errors are eliminated that originate from the transmission characteristics of cables used in measurements at high frequencies and measurements using long cables. The errors are eliminated by connecting resistors that are equal in resistance to the characteristic impedance of cables, to the inputs of the cables which connect the device under test to a measuring device.
REFERENCES:
patent: 4928062 (1990-05-01), Miles et al.
patent: 5345182 (1994-09-01), Wakamatsu
"The Impedance Measurement Handbook", Hewlett Packard, Feb., 1989, HP PIN 5950-3000, pp. 2-1 to 2-3, 3-1 to 3-4, 4-8 to 4-9.
"High-Frequency Measurement Techniques For Magnetic Cores", IEEE Power Electronics Specialists Conference, V. Joseph Thottuvelil, et al., 1985, pp. 412 to 425.
"100kHz-10MHz Iron Loss Measurement System", IEEE Transactions on Magnetics, T. Sato, et al., Sep., 1985, vol. MAG-23, No. 5, pp. 2593 to 2595.
"Some Problems On Very High Frequency Iron Loss Measuring System" T. Sato, et al., 1986, PE86-27, pp. 17 to 24. (in Japanese, with English translation).
Hewlett--Packard Company
Strecker Gerard R.
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