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Electrical Noise Attenuator

IP.com Disclosure Number: IPCOM000086596D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Ovies, H: AUTHOR [+2]

Abstract

In the monitoring of moderate temperatures for multitechnology populated cards of a digital system, thermocouples are placed in electrical contact with module pins. The effect of high-frequency electrical noise picked up by the thermocouple wire from the surrounding environment can be to induce an error in the electrical operation of the card and digital system. Figs. 1 and 2 show a filter which may be used to appreciably reduce the effects of such high-frequency electrical noise.

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Electrical Noise Attenuator

In the monitoring of moderate temperatures for multitechnology populated cards of a digital system, thermocouples are placed in electrical contact with module pins. The effect of high-frequency electrical noise picked up by the thermocouple wire from the surrounding environment can be to induce an error in the electrical operation of the card and digital system. Figs. 1 and 2 show a filter which may be used to appreciably reduce the effects of such high-frequency electrical noise.

The filter comprises a ferrite-core body in halves which can be associated to form a ring. The thermocouples are attached as closely as possible to the junction to be measured. The pair of leads 2 from the thermocouples to the indicator meter will be wrapped several turns around one of the core halves as closely to the thermocouple end as is convenient. More than one set of thermocouple leads can be wound around one core.

The two halves of cope 1 are held together by a spring clip 3 which has a magnet 4 fixed to one side to hold the core to the machine frame 5 near the junctions being measured. One end of wire 6 is shown connected to the other side of clamp 3, and the other end will be connected to the machine frame to provide an electrical ground.

The core 1, with its pair of wires 2, provides substantial impedance to the high-frequency electrical noise induced by external sources, thereby reducing the probability of error being introduced into the electrica...