LOW-FREQUENCY CURRENT-PROBE SYSTEM FOR MEASURING CONDUCTED RADIO-FREQUENCY INTERFERENCE.
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
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A new approach to the problem of measuring conducted radio-frequency interference is described. An instrument was developed which has the capability of measuring the impedance levels and noise currents of a power line or cord which is to be tested for conducted interference. The report describes the instrument in detail. The outstanding features of this instrument are, first its simplicity of operation in that the impedance magnitude and phase angle of the line are presented automatically on panel meters, and secondly the completeness with which the conducted RFI may be measured. Either the noise-source impedance or the load impedance or both may be determined easily with this instrument. The RFI currents may be measured in a conventional manner. Knowing the impedance levels of the line under test and the RFI current which pass through them enables one to specify completely in terms of the fundamental units of power the RFI characteristics of the line under test. An evaluation of the hardware developed is presented, as well as numerous examples of RFI measurements showing the correlation between measured and predicted results. The design accuracy of the system is 10 percent for the frequency range from 20 kc to 2 mc and the impedance range from 10 to 10,000 ohms at 0 to 360 degrees. Author