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High Frequency Noise Pulse Measuring and Eliminating

IP.com Disclosure Number: IPCOM000094717D
Original Publication Date: 1965-May-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 78K

Publishing Venue

IBM

Related People

Matsuda, K: AUTHOR

Abstract

Spurious high-frequency noise pulses are frequently established between one or more conductors 10, 12 and 14 of an electric power line and an effectively conductive element. The former can be grounded conductor 14. The latter can be either a wall or a floor 16, constructed of material usually considered an insulator such as concrete, wood, vinyl, etc.

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High Frequency Noise Pulse Measuring and Eliminating

Spurious high-frequency noise pulses are frequently established between one or more conductors 10, 12 and 14 of an electric power line and an effectively conductive element. The former can be grounded conductor 14. The latter can be either a wall or a floor 16, constructed of material usually considered an insulator such as concrete, wood, vinyl, etc.

Highly conductive surface element 22 is laid in contact or contiguous to floor
16. This constitutes the poorly conductive element represented by the effective ground plane conductor 16' to effect a transmission line for noise pulses at the frequency under consideration. The transmission line thus formed provides a low impedance shunt, of the order of ten ohms or less, to the higher impedance of the power line, 100 - 150 ohms, feeding electric powered equipment 24.

Bronze window screen, 3' x 10' in area, for example, placed either under equipment 24 or elsewhere in the room, is connected by conductor 26 to grounded power line conductor or shield conductor 18 of power cord 20 at a point farthest from the equipment. In practice, the shield usually extends to receptacle box 28. This connection usually is made at box 28.

By interposing a high impedance voltmeter in conductor 26, as shown in the inset, the pulse voltage between shield 18 and the effective ground plane reference conductor 22 can be measured.

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