Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1987-10-01
1989-07-18
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 2700
Patent
active
048496855
ABSTRACT:
Measurement of electromagnetic interference (EMI), especially conducted emissions from electrical equipment under test (EUT) to transmission lines powering the EUT; and then limiting such EMI. Differential mode (as distinguished from common mode) EMI conducted emissions are excluded temporarily from measurement by interposing a differential mode rejection network (DMRN) between the EUT and an EMI-sensitive receiver, and such common mode EMI is measured. A filter against such common mode conducted emissions is designed and is interposed between the EUT and the EMI receiver, and such differential mode EMI is then measured--with the DMRN removed. A filter against the differential mode conductive emissions is also designed and interposed between the EUT and the receiver, and the total conducted emissions are rechecked. The respective filters are combined into a composite filter for the EUT to prevent such EMI conductive emissions from entering power transmission lines.
REFERENCES:
patent: 4263549 (1981-04-01), Toppeto
Schneider, "Noise Scource . . . Model . . . Filter Design" 1983, Proceedings of Powercon 10, pp. 167-175.
Nave, "Prediction of Conducted Emissions . . . " 1986, IEEE Intl. Symposium on EMC.
Toppeto, "Test Method . . . " 1979, EMC Symposium, Rollerdam.
Eisenzopf Reinhard J.
McClure Charles A.
Snow Walter E.
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